Mcdermott International (MDRIQ) 8-K 11 May 15 Management’s Discussion and Analysis of Financial Condition and Results of Operations Financial data

Document_and_Entity_Informatio

Document and Entity Information	12 Months Ended
	Dec. 31, 2014
Document And Entity Information [Abstract]
Entity Registrant Name	MCDERMOTT INTERNATIONAL INC
Entity Central Index Key	708819
Document Type	8-K
Document Period End Date	31-Dec-14
Amendment Flag	FALSE

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenues	$2,300,889	$2,658,932	$3,641,624
Costs and Expenses:
Cost of operations	2,113,013	2,801,426	3,100,009
Selling, general and administrative expenses	208,564	193,126	218,162
Asset impairments	-9,002	84,482
Gains on asset disposals	-46,201	-15,200	-405
Restructuring expenses	18,113	35,727
Total costs and expenses	2,284,487	3,099,561	3,317,766
Equity in Losses of Unconsolidated Affiliates	-7,848	-16,116	-16,719
Operating Income (Loss)	8,554	-456,745	307,139
Other Income (Expense):
Interest income (expense) - net	-60,877	1,353	4,656
Gain (loss) on foreign currency-net	7,234	16,872	20,142
Other income (expense) - net	-232	-2,339	-995
Total other income (expense)	-53,875	15,886	23,803
Income (loss) from continuing operations before provision for income taxes, discontinued operations and noncontrolling interests	-45,321	-440,859	330,942
Provision for Income Taxes	20,073	49,051	129,204
Income (loss) from continuing operations before discontinued operations and noncontrolling interests	-65,394	-489,910	201,738
Gain on disposal of discontinued operation			257
Income from discontinued operation, net of tax			3,240
Total income from discontinued operations, net of tax			3,497
Net income (loss)	-65,394	-489,910	205,235
Less: net income attributable to noncontrolling interest	10,600	18,958	10,770
Net income (loss) attributable to McDermott International, Inc.	($75,994)	($508,868)	$194,465
Basic earnings (loss) per share
Income (loss) from continuing operations less noncontrolling interest	($0.32)	($2.15)	$0.81
Income (loss) from discontinued operations, net of tax			$0.01
Net income (loss) attributable to McDermott International, Inc.	($0.32)	($2.15)	$0.83
Diluted earnings (loss) per share:
Income (loss) from continuing operations less noncontrolling interest	($0.32)	($2.15)	$0.80
Income (loss) from discontinued operations, net of tax			$0.01
Net income (loss) attributable to McDermott International, Inc.	($0.32)	($2.15)	$0.82
Shares used in the computation of earnings per share:
Basic:	237,229,086	236,514,584	235,638,422
Diluted:	237,229,086	236,514,584	237,619,688

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net Income (Loss)	($65,394)	($489,910)	$205,235
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on investments	3	2,554	2,087
Foreign currency translation	-12,653	804	9,072
Gain (loss) on derivatives	-37,537	-57,176	8,711
Other comprehensive income (loss), net of tax	-50,187	-53,818	19,870
Total Comprehensive Income (Loss)	-115,581	-543,728	225,105
Less: Comprehensive Income Attributable to Non-controlling Interests	10,511	18,903	10,835
Comprehensive Income (Loss) Attributable to McDermott International, Inc.	($126,092)	($562,631)	$214,270

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current Assets:
Cash and cash equivalents	$665,309	$118,702
Restricted cash and cash equivalents	187,585	23,652
Accounts receivable – trade, net	143,370	381,858
Accounts receivable – other	81,088	89,273
Contracts in progress	357,617	425,986
Deferred income taxes	7,514	7,091
Assets held for sale	14,253	1,396
Other current assets	51,378	32,242
Total Current Assets	1,508,114	1,080,200
Property, Plant and Equipment	2,473,563	2,367,686
Less accumulated depreciation	-830,467	-889,009
Net Property, Plant and Equipment	1,643,096	1,478,677
Accounts Receivable – Long-Term Retainages	137,468	65,365
Investments in Unconsolidated Affiliates	38,186	50,536
Deferred Income Taxes	17,313	16,766
Assets Held for Sale		12,243
Investments	2,216	13,511
Other Assets	97,564	90,073
Total Assets	3,443,957	2,807,371
Current Liabilities:
Notes payable and current maturities of long-term debt	27,026	39,543
Accounts payable	251,924	398,739
Accrued liabilities	337,209	365,224
Advance billings on contracts	199,865	278,929
Deferred income taxes	19,753	17,892
Income taxes payable	25,165	20,657
Total Current Liabilities	860,942	1,120,984
Long-Term Debt	864,521	49,019
Self-Insurance	17,026	20,531
Pension Liability	18,403	15,681
Non-current Income Taxes	49,229	56,042
Other Liabilities	94,722	104,770
Commitments and Contingencies (Note 12)
Stockholders' Equity:
Common stock, par value $1.00 per share, authorized 400,000,000 shares; issued 245,209,850 and 244,271,365 shares at December 31, 2014 and December 31, 2013, respectively	245,210	244,271
Capital in excess of par value (including prepaid common stock purchase contracts)	1,676,815	1,414,457
Accumulated Deficit	-239,572	-163,578
Treasury stock, at cost: 7,400,027 and 7,130,294 shares at December 31, 2014 and December 31, 2013, respectively	-96,441	-97,926
Accumulated other comprehensive loss	-97,808	-47,710
Stockholders' Equity - McDermott International, Inc.	1,488,204	1,349,514
Noncontrolling interest	50,910	90,830
Total Equity	1,539,114	1,440,344
Total Liabilities and Equity	$3,443,957	$2,807,371

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Common stock, par value	$1	$1
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	245,209,850	244,271,365
Treasury stock, shares	7,400,027	7,130,294

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income (Loss)	($65,394)	($489,910)	$205,235
(Income) loss from discontinued operations, net of tax			-3,497
Income (loss) from continuing operations before discontinued operations and noncontrolling interests	-65,394	-489,910	201,738
Non-cash items included in net loss:
Depreciation and amortization	93,185	84,580	86,440
Drydock amortization	19,719	18,467	25,545
Loss on asset impairments	-9,002	84,482
Stock-based compensation charges	18,565	21,100	15,369
Equity in losses of unconsolidated affiliates	7,848	16,116	16,719
Gain on foreign currency-net	-10,310	-13,247	-23,116
Restructuring activity	-2,310	18,044
Gains on asset disposals	-46,201	-15,200	-405
Deferred taxes	891	-5,359	3,847
Other non-cash items	-3,605	-6,029	6,837
Changes in assets and liabilities, net of effects from acquisitions and dispositions:
Accounts receivable	166,385	30,156	-5,920
Net contracts in progress and advance billings on contracts	-10,695	171,397	-351,604
Accounts payable	-154,439	-17,493	84,430
Accrued and other current liabilities	-2,801	-22,155	36,922
Pension liability and accrued postretirement and employee benefits	-1,861	-30,828	34,847
Income taxes	-4,668	-54,431	22,832
Other assets and liabilities	11,653	-46,301	55,303
TOTAL CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES - CONTINUING OPERATIONS	6,960	-256,611	209,784
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	-321,187	-283,962	-286,310
(Increase) decrease in restricted cash and cash equivalents	-163,933	-5,536	3,846
Purchases of available-for-sale securities	-3,695	-10,535	-95,964
Sales and maturities of available-for-sale securities	12,978	43,959	191,298
Investments in unconsolidated affiliates	-2,420	-9,354	-5,084
Proceeds from asset dispositions	71,961	37,386	3,291
Other investing activities	-2,706	-3,113	0
NET CASH USED IN INVESTING ACTIVITIES - CONTINUING OPERATIONS	-409,002	-231,155	-188,923
NET CASH PROVIDED BY INVESTING ACTIVITIES - DISCONTINUED OPERATIONS			60,671
TOTAL CASH USED IN INVESTING ACTIVITIES	-409,002	-231,155	-128,252
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from debt	1,328,875	296,000	19,034
Payment of debt	-298,534	-310,146	-10,061
Issuance of common stock	327	68	215
Purchase of treasury stock	-1,707	-1,106	-2,898
Debt issuance costs	-39,112	-4,905	52
Distributions to noncontrolling interests	-6,352	-13,743	-20,135
Acquisition of noncontrolling interest	-32,943
TOTAL CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	950,554	-33,832	-13,793
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	-1,905	153	1,554
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	546,607	-521,445	69,293
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	118,702	640,147	570,854
CASH AND CASH EQUIVALENTS AT END OF YEAR	665,309	118,702	640,147
Cash paid during the period for:
Income taxes (net of refunds)	26,661	105,444	89,451
Interest expense (net of amount capitalized)	$28,390

CONSOLIDATED_STATEMENTS_OF_EQU

CONSOLIDATED STATEMENTS OF EQUITY (USD $)	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) [Member]	Treasury Stock [Member]	Stockholders' Equity [Member]	Noncontrolling Interest ("NCI") [Member]
In Thousands, except Share data
Beginning Balance at Dec. 31, 2011	$1,733,712	$242,416	$1,375,976	$150,825	($13,752)	($95,827)	$1,659,638	$74,074
Beginning Balance (in shares) at Dec. 31, 2011		242,416,424
Net Income (Loss)	205,235			194,465			194,465	10,770
Other comprehensive income (loss), net of tax	19,870				19,805		19,805	65
Exercise of stock options	952	215	737				952
Exercise of stock options (in shares)		214,946
Share vesting		811	-811
Share vesting (in shares)		810,786
Stock-based compensation charges	15,369		15,369				15,369
Purchase of treasury shares	-2,898					-2,898	-2,898
Distributions to NCI	-20,135							-20,135
Ending Balance at Dec. 31, 2012	1,952,105	243,442	1,391,271	345,290	6,053	-98,725	1,887,331	64,774
Ending Balance (in shares) at Dec. 31, 2012		243,442,156
Net Income (Loss)	-489,910			-508,868			-508,868	18,958
Other comprehensive income (loss), net of tax	-53,818				-53,763		-53,763	-55
Exercise of stock options	207	68	139				207
Exercise of stock options (in shares)		68,285
Share vesting		461	-461
Share vesting (in shares)		460,923
Stock-based compensation charges	21,100		18,936			2,164	21,100
Purchase of treasury shares	-1,106					-1,106	-1,106
Sales of subsidiary shares to NCI	25,509		4,613				4,613	20,896
Distributions to NCI	-13,743							-13,743
Other		300	-41			-259
Other (in shares)		300,001
Ending Balance at Dec. 31, 2013	1,440,344	244,271	1,414,457	-163,578	-47,710	-97,926	1,349,514	90,830
Ending Balance (in shares) at Dec. 31, 2013		244,271,365
Net Income (Loss)	-65,394			-75,994			-75,994	10,600
Other comprehensive income (loss), net of tax	-50,187				-50,098		-50,098	-89
Exercise of stock options	327	170	157				327
Exercise of stock options (in shares)		169,322
Share vesting		769	-769				0
Share vesting (in shares)		769,163
Stock-based compensation charges	16,516		13,324			3,192	16,516
Purchase of treasury shares	-1,707					-1,707	-1,707
Sales of subsidiary shares to NCI	-1,534		-1,534				-1,534
Distributions to NCI	-6,352							-6,352
Acquisition of NCI	-32,943		11,136				11,136	-44,079
Issuance of tangible equity units	240,044		240,044				240,044
Ending Balance at Dec. 31, 2014	$1,539,114	$245,210	$1,676,815	($239,572)	($97,808)	($96,441)	$1,488,204	$50,910
Ending Balance (in shares) at Dec. 31, 2014		245,209,850

BASIS_OF_PRESENTATION_AND_SIGN

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES	NOTE 1—BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES
	Nature of Operations
	McDermott International, Inc. (“MII”), a corporation incorporated under the laws of the Republic of Panama in 1959, is a engineering, procurement, construction and installation (“EPCI”) company focused on designing and executing complex offshore oil and gas projects worldwide. Providing fully integrated EPCI services, we deliver fixed and floating production facilities, pipeline installations and subsea systems from concept to commissioning. Operating in approximately 20 countries across the Americas, Middle East, Asia, the North Sea and Africa, our integrated resources include approximately 13,400 employees and a diversified fleet of marine vessels, fabrication facilities and engineering offices. We support our activities with comprehensive project management and procurement services, while utilizing our fully integrated capabilities in both shallow water and deepwater construction. Our customers include national, major integrated and other oil and gas companies, and we operate in most major offshore oil and gas producing regions throughout the world. We execute our contracts through a variety of methods, principally fixed-price, but also including cost reimbursable, cost-plus, day-rate and unit-rate basis or some combination of those methods. In these notes to our consolidated financial statements, unless the context otherwise indicates, “we,” “us” and “our” mean MII and its consolidated subsidiaries.
	Basis of Presentation
	We have presented our consolidated financial statements in U.S. Dollars in accordance with accounting principles generally accepted in the United States (“GAAP”). These consolidated financial statements include the accounts of McDermott International, Inc., its consolidated subsidiaries and controlled entities. We use the equity method to account for investments in entities that we do not control, but over which we have significant influence. We generally refer to these entities as “joint ventures” or “unconsolidated affiliates.” We have eliminated all intercompany transactions and accounts.
	We report financial results under three reporting segments consisting of Asia (“ASA”), Americas, Europe and Africa (“AEA”) and the Middle East (“MEA”). We also report certain corporate and other non-operating activities under the heading “Corporate and Other.” Corporate and Other primarily reflects corporate personnel and activities, incentive compensation programs and other costs, which are generally fully allocated to our operating segments. For financial information about our segments, see Note 11—“Segment Reporting”.
	Consolidated statements of cash flows for the years ended December 31, 2013 and 2012 include amounts of gain on foreign currency of $13.2 million and $23.1 million, respectively, that have been reclassified to conform to 2014 presentation. Certain 2013 amounts in consolidated balance sheet have been reclassified to conform to 2014 presentation.
	Business Segments
	We continue to evolve our operating model to improve efficiency of decision-making so that we are able to better optimize market opportunities. In the first quarter of 2015, we completed changes to our organizational structure which resulted in realignment of our reporting segments. The North Sea and Africa operations were previously aggregated into the Middle East operating segment. However, the responsibility for business decisions relating to the North Sea and Africa was moved to our Americas operating segment in the first quarter of 2015. As a result, the North Sea and Africa business is reflected in our Americas segment, now referred to as Americas, Europe and Africa. All comparable periods presented have been revised to reflect this change. Accordingly, we now report financial results under three reporting segments consisting of (1) Americas, Europe and Africa (“AEA”), (2) the Middle East (“MEA”) and (3) Asia (“ASA”). We also report certain corporate and other non-operating activities under the heading “Corporate and other,” which primarily reflects corporate personnel and activities, incentive compensation programs and other costs that are generally fully allocated to our operating segments. However, corporate restructuring costs associated with our corporate reorganization are not allocated. See Note 11 for summarized financial information on our segments.
	Pension Accounting Change
	In the fourth quarter of 2014, we elected to change our accounting method for recognizing actuarial gains and losses for our pension and other post-retirement benefit plans. Historically, these gains and losses were recognized as a component of accumulated other comprehensive income (loss) on our consolidated balance sheets and amortized into our consolidated statements of operations and comprehensive income (loss) over the average future service period or the average remaining life expectancy of the plan participants.   Under the new accounting method, we immediately recognize actuarial gains and losses into earnings in the fourth quarter each year as a component of net periodic benefit cost. We believe the new accounting method is preferable as it accelerates recognition of gains and losses into net income to be closer to when events resulting in gains and losses occur, such as plan investment performance, changes in discount rates, interest rate movements, mortality expectations and changes in other actuarial assumptions. This change has been reported through retrospective application of the new accounting method to all periods presented. See Note 4 for a further discussion of our pension and postretirement benefits and Notes 13 and 14 for disclosures relating to the effect of this change in our accounting method. Also see “— Accumulated Other Comprehensive Loss” and Note 9 for certain tax restated disclosures relating to pension accounting change.
	Revenue Recognition
	We determine the appropriate accounting method for each of our long-term contracts before work on the project begins. We generally recognize contract revenues and related costs on a percentage-of-completion method for individual contracts or combinations of contracts based on work performed, man hours, or a cost-to-cost method, as applicable to the activity involved. We include the amount of accumulated contract costs and estimated earnings that exceed billings to customers in contracts in progress. We include billings to customers that exceed accumulated contract costs and estimated earnings in advance billings on contracts. Most long-term contracts contain provisions for progress payments. We expect to invoice customers for all unbilled revenues. Certain costs are generally excluded from the cost-to-cost method of measuring progress, such as significant costs for materials and third-party subcontractors. Costs incurred prior to a project award are generally expensed during the period in which they are incurred. Total estimated project costs, and resulting contract income, are affected by changes in the expected cost of materials and labor, productivity, vessel costs, scheduling and other factors. Additionally, external factors such as weather, customer requirements and other factors outside of our control may affect the progress and estimated cost of a project’s completion and, therefore, the timing and amount of revenue and income recognition. In addition, change orders, which are a normal and recurring part of our business, can increase (sometimes substantially) the future scope and cost of a job. Therefore, change order awards (although frequently beneficial in the long term) can have the short-term effect of reducing the job percentage of completion and thus the revenues and profits recognized to date. We regularly review contract price and cost estimates as the work progresses and reflect adjustments in profit, proportionate to the job percentage of completion in the period when those estimates are revised. Revenue from unapproved change orders is generally recognized to the extent of the lesser of amounts we expect to recover or costs incurred. Additionally, to the extent that claims included in backlog, including those which arise from change orders which are under dispute or which have been previously rejected by the customer, are not resolved in our favor, there could be reductions in, or reversals of previously reported amounts of, revenues and profits, and charges against current earnings, which could be material.
	Claims Revenue
	Claims revenue may relate to various factors, including the procurement of materials, equipment performance failures, change order disputes or schedule disruptions and other delays, including those associated with weather or sea conditions. Claims revenue, when recorded, is only recorded to the extent of the lesser of the amounts management expects to recover or the associated costs incurred in our consolidated financial statements. We include certain unapproved claims in the applicable contract values when we have a legal basis to do so, consider collection to be probable and believe we can reliably estimate the ultimate value. Amounts attributable to unapproved change orders are not included in claims. We continue to actively engage in negotiations with our customers on our outstanding claims. However, these claims may be resolved at amounts that differ from our current estimates, which could result in increases or decreases in future estimated contract profits or losses. Claims are generally negotiated over the course of the respective projects and many of our projects are long-term in nature. None of the claims included in our estimates at completion at December 31, 2014 were the subject of any litigation proceedings.
	The amount of revenues and costs included in our estimates at completion (i.e., contract values) associated with such claims was $6.5 million and $17.2 million as of December 31, 2014 and December 31, 2013, respectively. All of those claim amounts at December 31, 2014 and 2013 were related to our MEA segment. These amounts are determined based on various factors, including our analysis of the underlying contractual language and our experience in making and resolving claims. There were no costs in the year ended December 31, 2014 in our consolidated financial statements pertaining to claims.  For the year ended December 31, 2013, $11.7 million of revenues and costs are included in our consolidated financial statements pertaining to claims, all of which were related to the MEA segment. Our unconsolidated joint ventures did not include any claims revenue or associated costs in their financial results for the year ended December 31, 2014 and 2013.
	We continue to actively engage in negotiations with our applicable customers with respect to our outstanding claims. However, these claims may be resolved at amounts that differ from our current estimates, which could result in increases or decreases in future estimated contract profits or losses.
	Deferred Profit Recognition
	For contracts as to which we are unable to estimate the final profitability due to their uncommon nature, including first-of-a-kind projects, we recognize equal amounts of revenue and cost until the final results can be estimated more precisely. For these contracts, we only recognize gross margin when reliably estimable and the level of uncertainty has been significantly reduced, which we generally determine to be when the contract is at least 70% complete. We treat long-term construction contracts that contain such a level of risk and uncertainty that estimation of the final outcome is impractical, as deferred profit recognition contracts If, while being accounted for under our deferred profit recognition policy, a current estimate of total contract costs indicates a loss, the projected loss is recognized in full and the project is accounted for under our normal revenue recognition guidelines. Prior to the fourth quarter of 2013, we accounted for an AEA segment project under our deferred profit recognition policy. The project was completed during the year ended December 31, 2014. Currently, we are not accounting for any projects under our deferred profit recognition policy.
	Completed Contract Method
	Under the completed contract method, revenue and gross profit is recognized only when a contract is completed or substantially complete. We generally do not enter into fixed-price contracts without an estimate of cost to complete that we believe to be accurate. However, it is possible that in the time between contract award and the commencement of work on a project, we could lose the ability to forecast costs to complete adequately, based on intervening events, including, but not limited to, experience on similar projects, civil unrest, strikes and volatility in our expected costs. In such a situation, we would use the completed contract method of accounting for that project. We did not enter into any contracts that we accounted for under the completed contract method during 2014, 2013 or 2012.
	Loss Recognition
	A risk associated with fixed-priced contracts is that revenue from customers may not cover increases in our costs. It is possible that current estimates could materially change for various reasons, including, but not limited to, fluctuations in forecasted labor and vessel productivity, vessel repair requirements, weather downtime, subcontractor or supplier performance, pipeline lay rates or steel and other raw material prices. Increases in costs associated with our fixed-price contracts could have a material adverse impact on our consolidated financial condition, results of operations and cash flows. Alternatively, reductions in overall contract costs at completion could materially improve our consolidated financial condition, results of operations and cash flows.
	As of December 31, 2014, we have provided for our estimated costs to complete on all of our ongoing contracts. However, it is possible that current estimates could change due to unforeseen events, which could result in adjustments to overall contract costs. Variations from estimated contract performance could result in material adjustments to operating results. For all contracts, if a current estimate of total contract cost indicates a loss, the projected loss is recognized in full when determined.
	Of the December 31, 2014 backlog, approximately $401.2 million relates to five active projects that are in a loss position, whereby future revenues are expected to equal costs when recognized. Included in this amount are $146.4 million of backlog associated with an EPCI project in Altamira which is expected to be completed in the fourth quarter of 2015, $102.2 million of backlog pertaining to a five-year charter of the Agile in Brazil, which began in early 2012, and $50.1 million of backlog relating to a charter project in Brazil scheduled for completion during the second quarter of 2015, all of which are being conducted by our AEA segment. The amount also includes $92.9 million of backlog relating to an EPCI project in Saudi Arabia which is expected to be completed by the third quarter of 2016 and $9.6 million of backlog relating to a hook-up project in Saudi Arabia scheduled for completion by the second quarter of 2015, both being conducted in our MEA segment. It is possible that our estimates of gross profit could increase or decrease based on changes in productivity, actual downtime and the resolution of change orders and claims with the customers.
	Use of Estimates
	We use estimates and assumptions to prepare our financial statements in conformity with GAAP. These estimates and assumptions affect the amounts we report in our financial statements and accompanying notes. Our actual results could differ from these estimates, and variances could materially affect our financial condition and results of operations in future periods. Changes in project estimates generally exclude change orders and changes in scope, but may include, without limitation, changes in cost recovery estimates, unexpected changes in weather conditions, productivity, unidentified required vessel repairs, customer and vendor delays and other costs. We generally expect to experience a reasonable amount of unanticipated events, and some of these events can result in significant cost increases above cost amounts we previously estimated. As of December 31, 2014, we have provided for our estimated costs to complete on all of our ongoing contracts. However, it is possible that current estimates could change due to unforeseen events, which could result in adjustments to overall contract costs. Variations from estimated contract performance could result in material adjustments to operating results. For all contracts, if a current estimate of total contract cost indicates a loss, the projected loss is recognized in full when determined.
	The following is a discussion of our most significant changes in estimates, which impacted operating income for the years ended December 31, 2014, 2013 and 2012.
	Year ended December 31, 2014
	Operating income for the year ended December 31, 2014 was impacted by changes in estimates relating to projects in each of our segments.
	The ASA segment experienced net favorable changes aggregating approximately $51.6 million, primarily attributable to changes in estimates on seven projects. Changes in estimates on a recently completed subsea project in Malaysia resulted in an improvement of approximately $34.3 million during the year ended December 31, 2014, primarily related to productivity improvements on our marine vessels and offshore support activities, as well as the favorable resolution of cost contingencies relating to offshore performance risks. On a recently completed marine installation project in Brunei, a reduction in estimated cost to complete from productivity improvements on marine vessels and offshore support activities resulted in a favorable change of approximately $11.8 million. On two previously completed projects, insurance claim collection and final project close-out adjustments resulted in a combined additional recovery of approximately $10.3 million during the year ended December 31, 2014. In addition, completion of two projects resulted in project close-out savings of approximately $6.3 million. These positive changes were partially offset by a negative change in estimate of $11.0 million on an EPCI project in Australia, primarily due to lower than expected fabrication productivity, increase in procurement costs as well as an increase in marine costs primarily due to changes in marine asset utilization.
	The MEA segment was negatively impacted by net unfavorable changes aggregating approximately $4.4 million, primarily attributable to changes in four projects. On one EPCI project in Saudi Arabia, we increased our estimated cost at completion by approximately $22.5 million (which may be recoverable from the customer, but which were not recognizable at December 31, 2014), primarily as a result of vessel downtime due to weather and standby delays amounting to $43.0 million, partially offset by increased cost recovery estimates of approximately $20.5 million based on positive discussions with the customer during the fourth quarter of 2014. On another EPCI project in Saudi Arabia, we increased our estimated cost to complete by $19.2 million, primarily as a result of increased cost estimates to complete the onshore scope. Although the project recognized a loss in the year ended December 31, 2013, it remains in an overall profitable position and is expected to be fully closed out by the quarter ending June 2015. On a third EPCI project in Saudi Arabia, we increased our estimated costs to complete by approximately $12.2 million, to reflect cost overruns related to (1) the onshore work, which was substantially completed in July 2014, and (2) delays in completing the offshore work, due to delayed access to the project site, resulting in a revised execution plan. The revised execution plan included the costs of an incremental mobilization and reflected inefficiencies of executing out-of-sequence work. This project remains profitable and is expected to be completed by March 2015. These negative changes were partially offset by approximately $53.5 million of increased cost recovery estimates on a recently completed pipelay project in the Caspian based on positive negotiations with the customer during the year ended December 31, 2014 in connection with the ongoing project close-out process. We expect final settlement on this process during early 2015, which could result in further changes to be recognized in 2015.
	The AEA segment was negatively impacted by net unfavorable changes in estimates aggregating $37.2 million associated with five projects. On an EPCI project in Altamira, we increased our estimated cost to complete by approximately $68.9 million, due to liquidated damages and extended project management costs arising from unexpected project delays and projected fabrication cost increases reflecting reduced productivity and execution plan changes to mitigate further project delays, as well as procurement and marine installation cost increases. This project is in a loss position and is estimated to be completed in the fourth quarter of 2015. On a subsea project in the U. S.  Gulf of Mexico, we increased our estimated cost to complete by approximately $5.5 million, primarily due to increased costs from equipment downtime issues on the North Ocean 102 (the “NO 102”), our primary vessel working on the project, partially offset by project close-out savings on marine spread costs and increased cost recovery estimates based on positive developments from the ongoing negotiations with the customer. This project, which was in a loss position, was completed during the year ended December 31, 2014. On a fabrication project in Morgan City completed during 2013, we reduced our cost recovery estimates by approximately $7.8 million, mainly based on an agreement in principle with the customer during the year ended December 31, 2014, which resulted in lower-than-anticipated recoveries. These negative impacts were partially offset by $39.8 million of project close-out improvements on an EPCI project in Brazil, which resulted from marine cost reductions upon completion of activities and increased recoveries due to successful developments from the ongoing approval process for additional weather-related compensation. We also recognized $5.2 million of cost reductions on a marine installation project in the U. S. Gulf of Mexico, mainly due to project close-out improvements.
	Year ended December 31, 2013
	For the year ended December 31, 2013, we recognized net project losses of approximately $315.1 million due to changes in estimates across all three of our operating segments.
	The ASA segment was negatively impacted by net losses of approximately $62.2 million due to changes in estimates on four projects. On the subsea project in Malaysia discussed above, we increased our estimated cost at completion by approximately $126.9 million primarily due to downtime on the NO 105 resulting from mechanical and offshore productivity issues. This project was completed in June 2014 with subsequent improvements of approximately $34.3 million in 2014, as discussed above. On an EPCI project in Australia we completed a settlement with the customer which resulted in lower-than-expected recoveries. This project was completed in the first quarter of 2013 and the settlement documents were executed on February 5, 2014. These deteriorations were partially offset by improvements on two projects. On another EPCI project in Australia, we reduced estimated costs to complete the project by approximately $64.1 million as a result of efficiencies and productivity improvements related to offshore hookup activities. This project was completed in early 2013. On a fabrication project in Australia, we increased our change order recovery and bonuses recognized by approximately $14.7 million resulting from settlements and achieved milestones. This project was completed in March 2014.
	The MEA segment was negatively impacted by losses of $174.4 million due to changes in estimates on four projects. On the pipelay project in the Caspian Sea, we reduced the estimate of cost recovery as a result of ongoing negotiations with the customer.  This project was completed in June 2014 with subsequent improvements of approximately $53.5 million in 2014, as discussed above. On an EPCI project in Saudi Arabia, we increased our estimated cost at completion by approximately $62.5 million, primarily as a result of revisions to the project’s execution plans, increases in our estimated cost to complete due to an extended offshore hookup campaign requiring multiple vessel mobilizations and delays in completion of onshore activities. On another EPCI project in Saudi Arabia, we increased our estimated cost to complete by approximately $16.5 million, primarily due to weather downtime and revisions to our estimated cost to complete the hookup campaign. On a third EPCI project in Saudi Arabia, we increased our estimated cost to complete by approximately $16.4 million due to procurement and design issues which were settled on less favorable terms than previously expected. This project is currently in a loss position and is expected to be completed during the third quarter of 2016.
	The AEA segment was negatively impacted by changes in estimates on six projects resulting in approximately $78.5 million of project losses. In Morgan City, we incurred additional costs of approximately $9.3 million to complete a fabrication project, primarily due to poor labor productivity. That project was completed during the fourth quarter of 2013. On a marine project in Mexico completed during 2012, we reversed previously recognized claim revenue by approximately $10.0 million due to unsuccessful claim resolution efforts. On the five-year charter of the Agile in Brazil, we increased the estimated cost to complete the project by approximately $8.6 million. The completion of this charter is expected during the first quarter of 2017. On two EPCI projects in Altamira, we increased our estimated costs at completion by approximately $40.9 million, primarily due to higher procurement costs, reduced labor productivity, and reduced utilization of the fabrication facility. Both of these projects are in a loss position. One was completed during the year ended December 31, 2014 and the other is expected to be completed by the fourth quarter of 2015. On a subsea project in the U.S. Gulf of Mexico, we recognized a loss of approximately $9.7 million, primarily driven by the recognition of liquidated damages due to the anticipated late arrival of vessels currently engaged on projects in Brazil and Malaysia. This project was completed during the year ended December 31, 2014.
	Year ended December 31, 2012
	Operating income for the year ended December 31, 2012 in our ASA segment benefited significantly from certain changes in estimates, which resulted in a reduction of remaining costs as a result of efficiencies and productivity improvements related to offshore hook-up activities on one of our EPCI projects, which was completed in early 2013. Excluding those cost savings, our costs increased by approximately 8% for the year ended December 31, 2012. These benefits were partially offset by certain project charges of approximately $23.0 million associated with anticipated productivity changes and project delays on one of our subsea projects, which was completed in 2014. In addition, our AEA segment was impacted by project charges of approximately $16.0 million relating to two projects, which were completed in 2013 primarily due to lower than expected fabrication productivity. In our MEA segment, we experienced project charges of approximately $13.0 million associated with increased cost estimates resulting from fabrication productivity and, to a lesser extent, higher than expected marine costs on a project, which was completed in early 2013.
	Loss Contingencies
	We record liabilities for loss contingencies when it is probable that a liability has been incurred and the amount of loss is reasonably estimable. We provide disclosure when there is a reasonable possibility that the ultimate loss will exceed the recorded provision or if such loss is not reasonably estimable. We are currently involved in litigation and other proceedings, as discussed in Note 12. We have accrued our estimates of the probable losses associated with these matters and associated legal costs are generally recognized in selling, general and administrative expenses as incurred. However, our losses are typically resolved over long periods of time and are often difficult to estimate due to various factors, including the possibility of multiple actions by third parties. Therefore, it is possible future earnings could be affected by changes in our estimates related to these matters.
	Cash and Cash Equivalents
	Our cash and cash equivalents are highly liquid investments with maturities of three months or less when we purchase them. We record cash and cash equivalents as restricted when we are unable to freely use such cash and cash equivalents for our general operating purposes. A majority of our restricted cash and cash equivalents serves as collateral for outstanding letters of credit, as further discussed in Note 3.
	Investments
	We classify investments available for current operations as current assets in the accompanying balance sheet, and we classify investments held for long-term purposes as noncurrent assets. We adjust the amortized cost of debt securities for amortization of premiums and accretion of discounts to maturity. That amortization is included in interest income. We include realized gains and losses on our investments in other income (expense)—net. The cost of securities sold is based on the specific identification method. We include interest earned on securities in interest income.
	Investments in Unconsolidated Affiliates
	We generally use the equity method of accounting for affiliates in which our investment ownership ranges from 20% to 50% and over which we exercise significant influence. Currently, all of our significant investments in affiliates that are not consolidated are recorded using the equity method.
	Accounts Receivable
	Accounts Receivable—Trade, Net
	A summary of contract receivables is as follows:
	We expect to invoice our unbilled receivables once certain milestones or other metrics are reached, and we expect to collect all unbilled amounts. We believe that our provision for losses on uncollectible accounts receivable is adequate for our credit loss exposure.
			31-Dec-14				31-Dec-13
			(in thousands)
	Contract receivables:
	Contracts in progress		$	106,174			$	192,745
	Completed contracts			34,698				77,248
	Retainages			28,586				127,698
	Unbilled			4,303				14,571
	Less allowances			(30,391	)			(30,404	)
	Accounts receivable—trade, net		$	143,370			$	381,858
	The following amounts represent retainages on contracts:
			31-Dec-14				31-Dec-13
			(in thousands)
Retainages expected to be collected within one year		$	28,586			$	127,698
Retainages expected to be collected after one year			137,468				65,365
Total retainages		$	166,054			$	193,063
We have included in accounts receivable—trade, net, retainages expected to be collected in 2015. Retainages expected to be collected after one year are included in other assets. Of the long-term retainages at December 31, 2014, we expect to collect $86.0 million in 2016 and $51.5 million in 2017.
Accounts Receivable—Other
A summary of accounts receivable—other is as follows:
	31-Dec-14				31-Dec-13
	(In thousands)
Other taxes receivable	$	31,392			$	14,934
Receivables from unconsolidated affiliates		20,061				36,181
Accrued unbilled revenue		15,442				15,696
Intercompany unbilled cost		3,978				5,373
Employee receivables		4,336				4,532
Foreign currency forward contracts		1,173				11,641
Other		4,706				916
Accounts receivable-other	$	81,088			$	89,273
Employee receivables are expected to be collected within 12 months, and any allowance for doubtful accounts on our accounts receivable—other is based on our estimate of the amount of probable losses due to the inability to collect these amounts (based on historical collection experience and other available information). As of December 31, 2014 and December 31, 2013, no such allowance for doubtful accounts was recorded.
Contracts in Progress and Advance Billings on Contracts
Contracts in progress were $357.6 million and $426.0 million at December 31, 2014 and December 31, 2013, respectively. Advance billings on contracts were $199.9 million and $278.9 million at December 31, 2014 and December 31, 2013, respectively. A detail of the components of contracts in progress and advance billings on contracts is as follows:
		31-Dec-14				31-Dec-13
		(In thousands)
Costs incurred less costs of revenue recognized		$	90,191			$	65,113
Revenues recognized less billings to customers			267,426				360,873
Contracts in Progress		$	357,617			$	425,986
Billings to customers less revenue recognized		$	578,896			$	466,205
Costs incurred less costs of revenue recognized			(379,031	)			(187,276	)
Advance Billings on Contracts		$	199,865			$	278,929
Other Non-Current Assets
We have included debt issuance costs in other non-current assets. The current portion of debt-issuance costs has been included in other current assets. We amortize debt issuance costs as interest expense on a straight-line basis over the life of the related debt. The following summarizes the changes in the carrying amount of these assets:
	Year ended December 31, 2014				Year ended December 31, 2013
	(In thousands)
Balance at beginning of period	$	14,951			$	13,761
Debt issuance costs		47,737				4,905
Former Credit Agreement debt issuance cost write off		(11,913	)			—
Amortization of interest expense		(10,999	)			(3,715	)
		39,776				14,951
Less: Current portion		(12,936	)			—
Noncurrent portion	$	26,840			$	14,951
Also included in other non-current assets are long-term deferred drydock expenses, long-term prepaid rent and other prepaid expenses.
Fair Value of Financial Instruments
Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. An established hierarchy for inputs is used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs that market participants would use in valuing the asset or liability and are developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors that market participants would use in valuing the asset or liability.
Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:
·	Level 1—inputs are based on quoted prices for identical instruments traded in active markets.
·	Level 2—inputs are based on quoted prices for similar instruments in active markets, quoted prices for similar or identical instruments in inactive markets and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets and liabilities.
·	Level 3—inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models and similar valuation techniques.
The carrying amounts that we have reported for financial instruments, including cash and cash equivalents, accounts receivables and accounts payable approximate their fair values. See Note 7 for additional information regarding fair value measurements.
Derivative Financial Instruments
Our worldwide operations give rise to exposure to changes in certain market conditions, which may adversely impact our financial performance. When we deem it appropriate, we use derivatives as a risk management tool to mitigate the potential impacts of certain market risks. The primary market risk we manage through the use of derivative instruments is movement in foreign currency exchange rates. We use foreign currency derivative contracts to reduce the impact of changes in foreign currency exchange rates on our operating results. We use these instruments to hedge our exposure associated with revenues and/or costs on our long-term contracts and other cash flow exposures that are denominated in currencies other than our operating entities’ functional currencies. We do not hold or issue financial instruments for trading or other speculative purposes.
In certain cases, contracts with our customers contain provisions under which some payments from our customers are denominated in U.S. Dollars and other payments are denominated in a foreign currency. In general, the payments denominated in a foreign currency are designed to compensate us for costs that we expect to incur in such foreign currency. In these cases, we may use derivative instruments to reduce the risks associated with foreign currency exchange rate fluctuations arising from differences in timing of our foreign currency cash inflows and outflows. We recognize all derivatives at fair value on the balance sheet. Derivatives that are not accounted for as hedges under ASC 815 - Derivatives and Hedging, are adjusted to fair value and such changes are reflected through the results of operations. If the derivative is designated as a hedge, depending on the nature of the hedge, changes in the fair value of derivatives are either offset against the change in fair value of the hedged assets, liabilities or firm commitments through earnings or recognized in other comprehensive income (loss) until the hedged item is recognized in earnings. See Note 5 for additional information regarding derivative financial instruments.
The ineffective portion of a derivative’s change in fair value and any portion excluded from the assessment of effectiveness are immediately recognized in earnings. Gains and losses on derivative financial instruments that are immediately recognized in earnings are included as a component of gain (loss) on foreign currency-net in our consolidated statements of operations.
Concentration of Credit Risk
Our principal customers are businesses in the offshore oil and gas industry. This concentration of customers may impact our overall exposure to credit risk, either positively or negatively, in that our customers may be similarly affected by changes in economic or other conditions. In addition, we and many of our customers operate worldwide and are therefore exposed to risks associated with the economic and political forces of various countries and geographic areas. We generally do not obtain any collateral for our receivables. See Note 11 for additional information about our operations in different geographic areas.
Foreign Currency Translation
We translate assets and liabilities of our foreign operations, other than operations in highly inflationary economies, into U.S. Dollars at year-end exchange rates, and we translate income statement items at average exchange rates for the periods presented. We record adjustments resulting from the translation of foreign currency financial statements as a component of other comprehensive income (loss), net of tax.
Capitalization of Interest Cost
We incurred interest of $85.4 million and capitalized, primarily on the vessels under construction, $23.9 million of interest in the year ended December 31, 2014. We incurred and capitalized $8.9 million and $8.6 million of interest in the years ended December 31, 2013 and 2012, respectively.
Earnings per Share
We have computed earnings per common share on the basis of the weighted average number of common shares, and, where dilutive, common share equivalents, outstanding during the indicated periods. See Note 10 for our earnings per share computations.
Accumulated Other Comprehensive Loss
Components of accumulated other comprehensive income (loss) (“AOCI”) have been restated to reflect the retrospective change in accounting method for recognizing actuarial gain and losses related to pension and postretirement benefit plans.
The components of AOCI included in stockholders’ equity are as follows:
	31-Dec-14				31-Dec-13
	(In thousands)
Foreign currency translation adjustments	$	(15,212	)		$	(2,562	)
Net gain on investments		241				238
Net loss on derivative financial instruments		(82,837	)			(45,386	)
Accumulated other comprehensive loss	$	(97,808	)		$	(47,710	)
The following tables present the components of AOCI and the amounts that were reclassified during the period:
		Foreign currency translation gain (loss)				Unrealized holding gain (loss) on investments			Deferred gain (loss) on derivatives(1)				TOTAL
		(in thousands)
Balance, January 1, 2013		$	(3,366	)		$	(2,316	)	$	11,735			$	6,053
Other comprehensive income (loss) before reclassification			804				920			(52,781	)			(51,057	)
Amounts reclassified from AOCI		—					1,634			(4,340	)	-2		(2,706	)
Net current period other comprehensive income (loss)			804				2,554			(57,121	)			(53,763	)
Balance, December 31, 2013		$	(2,562	)		$	238		$	(45,386	)		$	(47,710	)
Other comprehensive income (loss) before reclassification			(9,250	)			3			(65,503	)			(74,750	)
Amounts reclassified from AOCI			(3,400	)		—				28,052		-2		24,652
Net current period other comprehensive income (loss)			(12,650	)			3			(37,451	)			(50,098	)
Balance, December 31, 2014		$	(15,212	)		$	241		$	(82,837	)		$	(97,808	)
-1	Refer to Note 6 for additional details
-2	Reclassified to cost of operations and gain on foreign currency, net
Stock-Based Compensation
Equity instruments are measured at fair value on the grant date. Stock-based compensation expense is generally recognized on a straight-line basis over the requisite service periods of the awards. We use a Black-Scholes model to determine the fair value of certain share-based awards, such as stock options. Additionally, we use a Monte Carlo model to determine the fair value of certain share-based awards that contain market and performance-based conditions. The use of these models requires highly subjective assumptions, such as assumptions about the expected life of the award, vesting probability, expected dividend yield and the volatility of our stock price.
Property, Plant and Equipment
We carry our property, plant and equipment at depreciated cost. Except for major marine vessels, we depreciate our property, plant and equipment using the straight-line method, over estimated economic useful lives of eight to 33 years for buildings and three to 28 years for machinery and equipment. We do not depreciate property, plant and equipment classified as held for sale.
We depreciate major marine vessels using the units-of-production method based on the utilization of each vessel. Our units-of-production method of depreciation involves the calculation of depreciation expense on each vessel based on the product of actual utilization for the vessel for the period and the applicable daily depreciation value (which is based on vessel book value, standard utilization and vessel life) for the vessel. Our actual utilization is determined based on the actual days that the vessel was working or otherwise actively engaged (other than in transit between regions) under a contract, as determined by daily vessel operating reports prepared by the crew of the vessel. Our standard utilization is determined by vessel at least annually based on recent actual utilization combined with an expectation of future utilization, both of which allow for idle time. We ensure that a minimum amount of accumulated depreciation of at least 50% of equivalent life-to-date straight-line depreciation is recorded. Additionally, in periods of very low utilization, a minimum amount of depreciation expense of at least 25% of an equivalent straight-line depreciation expense (which is based on an initial 25-year life) is recorded.
Our depreciation expense was $93.2 million, $84.6 million and $86.4 million for the years ended December 31, 2014, 2013 and 2012, respectively.
A summary of property, plant and equipment by asset category is as follows:
		Year Ended December 31,
		2014				2013
		(In thousands)
Marine Vessels		$	1,241,105			$	1,089,121
Construction Equipment			496,557				576,855
Construction in Progress			435,447				408,705
Buildings			159,623				161,407
All other			140,831				131,598
Total Cost		$	2,473,563			$	2,367,686
Accumulated Depreciation			(830,467	)			(889,009	)
Net Book Value		$	1,643,096			$	1,478,677
We capitalize drydocking costs in other assets when incurred and amortize the costs over the period of time between drydockings, which is generally three to five years. We expense the costs of other maintenance, repairs and renewals, which do not materially prolong the useful life of an asset, as we incur them.
Impairment Review
We review goodwill for impairment on an annual basis or more frequently if circumstances indicate that impairment may exist. The annual impairment review involves comparing the fair value to the net book value of each applicable reporting unit and, therefore, is significantly impacted by estimates and judgments.
We recorded a goodwill impairment charge of approximately $46.7 million in the fourth quarter of 2013 in our consolidated statements of operations. This amount represented the total amount of our goodwill, which was primarily related to a 2007 acquisition.
We review our tangible and intangible long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. If an evaluation is required, the fair value of each applicable asset is compared to its carrying value. Factors that impact our determination of potential impairment include forecasted utilization of equipment and estimates of forecasted cash flows from projects expected to be performed in future periods. Our estimates of cash flow may differ from actual cash flow due to, among other things, economic conditions or changes in operating performance. Any changes in such factors may negatively affect our business segments and result in future asset impairments. During the year ended December 31, 2014, we determined that certain of our intangible assets were fully impaired and recorded an impairment charge of approximately $1.7 million in the quarter ended December 31, 2014.
In June 2014, we cancelled a pipelay system originally intended for the CSV 108, which resulted in a $10.7 million improvement to the cancellation cost estimate included in the $37.8 million of vessel-impairment charges recognized during the year ended December 31, 2013.
Based on market conditions and expected future utilization of our entire marine fleet, we recognized impairment charges totaling approximately $37.8 million during the year ended December 31, 2013 in our consolidated statements of operations related to the cancellation of in-progress upgrades to one of our existing marine vessels and the deferral of a portion of the scope of work relating to one of our marine vessels under construction. We used appraised values and discounted future cash flows associated with the assets to determine the impairment amounts. Appraised values and discounted cash flows involve significant management judgments.
We did not recognize any impairment for the year ended December 31, 2012.
Income Taxes
We provide for income taxes based on the tax laws and rates in the countries in which we conduct our operations. MII is a Panamanian corporation that earns all of its income outside of Panama. As a result, we are not subject to income tax in Panama. We operate in various taxing jurisdictions around the world. Each of these jurisdictions has a regime of taxation that varies, not only with respect to nominal rates, but also with respect to the basis on which these rates are applied. These variations, along with changes in our mix of income or loss from these jurisdictions, may contribute to shifts, sometimes significant, in our effective tax rate.
We believe that our deferred tax assets recorded as of December 31, 2014 are realizable through carrybacks, future reversals of existing taxable temporary differences and future taxable income. We record a valuation allowance to reduce our deferred tax assets to the amount that is more likely than not to be realized. If we subsequently determine that we will be able to realize deferred tax assets in the future in excess of our net recorded amount, the resulting adjustment would increase earnings for the period in which such determination was made. We will continue to assess the adequacy of the valuation allowance on a quarterly basis. Any changes to our estimated valuation allowance could be material to our consolidated financial condition and results of operations. See Note 9 for additional disclosures relating to income taxes.
Insurance and Self-Insurance
Our wholly owned “captive” insurance subsidiary provides coverage for our retentions under employer’s liability, general and products liability, automobile liability and workers’ compensation insurance and, from time to time, builder’s risk and marine hull insurance within certain limits. We may also have business reasons in the future to arrange for our insurance subsidiary to insure other risks which we cannot or do not wish to transfer to outside insurance companies. Premiums charged and reserves related to these insurance programs are based on the facts and circumstances specific to the insurance claims, our past experience with similar claims, loss factors and the performance of the outside insurance market for the type of risk at issue. The actual outcome of insured claims could differ significantly from estimated amounts. We maintain actuarially determined accruals in our consolidated balance sheets to cover self-insurance retentions for the coverages discussed above. These accruals are based on various assumptions developed utilizing historical data to project future losses. Loss estimates in the calculation of these accruals are adjusted as required based upon actual claim settlements and reported claims. We reduced our self-insurance accruals, primarily due to fewer and less severe Workers’ Compensation claims, by $8.0 million, $7.2 million and $6.8 million during the years ended December 31, 2014, 2013 and 2012, respectively, and recognized these reductions in cost of operations in our consolidated statements of operations.
Recently Issued Accounting Standards
In August 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2014-15, “Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern” (“ASU 2014-15”). Currently, there is no guidance in effect under U.S. GAAP regarding management’s responsibility to assess whether there is substantial doubt about an entity’s ability to continue as a going concern. Under ASU 2014-15, we will be required to assess our ability to continue as a going concern each interim and annual reporting period and provide certain disclosures if there is substantial doubt about our ability to continue as a going concern, including management’s plan to alleviate the substantial doubt. ASU 2014-15 is effective for annual periods ending after December 15, 2016 and interim periods thereafter with early adoption permitted. We are currently assessing the impact of the adoption of ASU 2014-15 on our future financial statements and related disclosures.
In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers”. This ASU will supersede most of the existing revenue recognition requirements in U.S. GAAP and will require entities to recognize revenue at an amount that reflects the consideration to which an entity expects to be entitled in exchange for transferring goods or services to a customer. It also requires significantly expanded disclosures regarding the qualitative and quantitative information of an entity’s nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. ASU No. 2014-09 will be effective for us for annual and interim reporting periods beginning after December 15, 2016, with early application not permitted. We have the choice to apply it either retrospectively to each reporting period presented or by recognizing the cumulative effect of applying it at the date of initial application (January 1, 2017) and not adjusting comparative information. We are currently evaluating the requirements of this ASU and have not yet determined its impact on our consolidated financial statements.
In April 2014, the FASB issued ASU No. 2014-08, “Presentation of Financial Statements and Property, Plant, and Equipment — Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity”, which amends the definition of a discontinued operation by raising the threshold for a disposal to qualify as discontinued operations. ASU 2014-08 will also require entities to provide additional disclosures about discontinued operations as well as disposal transactions that do not meet the discontinued operations criteria. The pronouncement is effective prospectively for all disposals (except disposals classified as held for sale before the adoption date) or components initially classified as held for sale in periods beginning on or after December 15, 2014. We have assessed the impact of the adoption of ASU 2014-08 and have determined that it has no impact on the presented financial statements and related disclosures.

ACQUISITIONS_DISPOSITIONS_AND_

ACQUISITIONS, DISPOSITIONS AND RESTRUCTURING	12 Months Ended
	Dec. 31, 2014
Discontinued Operations And Disposal Groups [Abstract]
ACQUISITIONS, DISPOSITIONS AND RESTRUCTURING	NOTE 2—ACQUISITIONS, DISPOSITIONS AND RESTRUCTURING
	Acquisitions
	In December 2014, J. Ray McDermott, S.A. (“JRMSA”), a wholly owned subsidiary of MII, exercised its option to purchase Oceanteam ASA’s 50% ownership interest in the entities, which own the NO 102. We have consolidated these entities since acquiring a 50% ownership interest in 2009. The cash consideration paid was approximately $32.9 million, and we recorded a corresponding decrease in noncontrolling interest of approximately $44.0 million, and an increase in capital in excess of par value of approximately $11.1 million.
	During the year ended December 31, 2013, we acquired all of the issued and outstanding shares of capital stock of Deepsea Group Limited, a United Kingdom-based company that provides subsea and other engineering services to international energy companies, primarily through offices in the United Kingdom and the United States. The total consideration we paid for the acquisition was approximately $9.0 million, which includes cash ($6.0 million) and the delivery of 313,580 restricted shares of MII common stock (out of treasury). The transaction was accounted for using the acquisition method and, accordingly, assets acquired and liabilities assumed were recorded at their respective fair values.
	During the year ended December 31, 2013, we entered into two joint ventures with TH Heavy Engineering Berhad (“THHE”), whereby we acquired a 30% interest in a subsidiary of THHE, THHE Fabricators Sdn. Bhd., and THHE acquired a 30% interest in our Malaysian subsidiary, Berlian McDermott Sdn. Bhd. As of December 31, 2013, we recorded an equity method investment of approximately $25.5 million, a non-controlling interest of approximately $20.9 million and an increase in capital in excess of par value of approximately $4.6 million arising from these transactions. During year ended December 31, 2014, we finalized our accounting for these transactions and recorded a decrease in an equity method investment of approximately $4.5 million and a decrease in capital in excess of par value of approximately $1.5 million. As a result of these adjustments in 2014, as of December 31, 2014, we had recorded an equity method investment of approximately $21.0 million, a non-controlling interest of approximately $20.9 million, and an increase in capital in excess of par value of approximately $3.1 million.
	Non-Core Asset Sales
	During the quarter ended September 30, 2014, we committed to a plan to sell vessel equipment, including dynamic positioning thrusters and a deepwater pipelay winch system. These items of equipment were part of upgrades to one of our marine vessels. We cancelled those upgrades in December 2013. These assets were classified as held for sale and are no longer being depreciated.
	We previously committed to a plan to sell four of our multi-function marine vessels, specifically the Bold Endurance, DB 26, DB 16 and the DLB KP1. During the year ended December 31, 2014, we completed the sale of the DB16 and the DLB KP1 for aggregate cash proceeds of approximately $24.5 million, resulting in an aggregate gain of approximately $11.1 million. During the year ended December 31, 2013, we completed the sale of the Bold Endurance and the DB 26 for aggregate cash proceeds of approximately $32.0 million, resulting in an aggregate gain of approximately $12.5 million.
	In April 2014, we completed the sale of our Harbor Island facility near Corpus Christi, Texas for proceeds of approximately $31.7 million, resulting in a gain of approximately $25.0 million, which has been recognized in our AEA segment.
	In June 2014, as part of our plan to discontinue utilization of our Morgan City facility, we disposed of several assets, including various items of equipment, for aggregate cash proceeds of approximately $13.6 million, resulting in an aggregate gain of approximately $11.4 million, of which approximately $1.3 million was recorded in connection with our Americas restructuring, discussed below. This portion of the gain pertained to impairments previously recorded in the year ended December 31, 2013 in connection with the Americas restructuring.
	Discontinued Operations
	The following discussion provides information pertaining to our significant discontinued operations.
	Charter Fleet Business
	On March 19, 2012, we completed the sale of our former charter fleet business, which operated 10 of the 14 vessels acquired in our 2007 Secunda Acquisition. The following table presents selected financial information regarding the results of operations attributable to our former charter fleet business:
			Year ended
			December 31,
			2012
			(In thousands)
	Revenues		$	8,184
	Gain on disposal of discontinued operations, before taxes			257
	Income before provision for income taxes			3,240
				3,497
	Provision for income taxes			—
	Income from discontinued operations, net of tax		$	3,497
	Restructuring
	We commenced a restructuring of our Americas operations during the quarter ended June 30, 2013, which involved our Morgan City, Louisiana, Houston, Texas, New Orleans, Louisiana and Brazil locations. The restructuring involved, among other things, reductions of management, administrative, fabrication and engineering personnel, and discontinued utilization of the Morgan City facility. With the completion of all remaining project activities from the Morgan City facility during the last quarter of 2014, the restructuring was substantially complete by December 31, 2014.  Future fabrication operations in the AEA segment are expected to be executed using the Altamira, Mexico facility. In addition, we exited our joint venture operation in Brazil in 2014. Costs associated with our Americas restructuring activities primarily included severance and other personnel-related costs, costs associated with exiting the joint venture in Brazil, asset impairment and relocation costs, environmental reserves and future unutilized lease costs.
	We have completed a major review of our cost structure, and we are implementing a plan to increase our profitability and flexibility through reduced fixed and variable costs. The plan includes headcount reductions, as well as the centralization of procurement and operational activities. We expect to incur $25.0 million to $30.0 million in restructuring costs in 2015, as a result of the review.
	In October 2013, we announced certain executive management changes that became effective during the fourth quarter of 2013. In March 2014, we changed our organizational structure to orient around offshore and subsea business activities through four primary geographic regions. Costs associated with our corporate reorganization activities have included severance, relocation and other personnel-related costs and costs for advisors.
	The following table presents total amounts incurred during the year ended December 31, 2014, as well as amounts incurred from the inception of our restructuring efforts up to December 31, 2014 and amounts expected to be incurred in the future by major type of cost and by segment.
		Incurred in the			Incurred in the			Incurred from restructuring inception to			Estimate of remaining amounts to be incurred			Total
		year ended			year ended			December 31, 2014
		31-Dec-14			December 31, 2013
	AEA
	Impairments and write offs	$	(1,240	)	$	14,163		$	12,923		$	—		$	12,923
	Severance and other personnel-related costs		3,735			9,645			13,380			476			13,856
	Morgan City environmental reserve		—			5,925			5,925			—			5,925
	Morgan City yard-related expenses		6,675			4,175			10,850			5,252			16,102
	Other		—			158			158			3,272			3,430
		$	9,170		$	34,066		$	43,236		$	9,000		$	52,236
	Corporate
	Severance and other personnel-related costs	$	938		$	1,661		$	2,599			—		$	2,599
	Legal and other advisor fees		7,207			—			7,207			—			7,207
	Other		798			—			798			—			798
		$	8,943		$	1,661		$	10,604			—			10,604
	Total	$	18,113		$	35,727		$	53,840		$	9,000		$	62,840
	The following table presents a roll forward of accrued liabilities associated with our restructuring activities:
		Morgan City			Severance and			Morgan City			Total
		environmental			other			yard-related
		reserve			personnel-			expenses and
					related accruals			other
		(In thousands)
	Balance at January 1, 2013	$	—		$	—		$	—		$	—
	Accruals		5,925			5,820			1,105			12,850
	Payments		—			(4,893	)		—			(4,893	)
	Balance at December 31, 2013	$	5,925		$	927		$	1,105		$	7,957
	Accruals		—			2,626			183			2,809
	Payments		(2,250	)		(3,553	)		(915	)		(6,718	)
	Balance at December 31, 2014	$	3,675		$	—		$	373		$	4,048

LONGTERM_DEBT_AND_NOTES_PAYABL

LONG-TERM DEBT AND NOTES PAYABLE	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
LONG-TERM DEBT AND NOTES PAYABLE	NOTE 3—LONG-TERM DEBT AND NOTES PAYABLE
	During April 2014, we refinanced our existing obligations, and replaced in its entirety our then existing $950.0 million credit agreement (the “Former Credit Agreement”) with a new credit agreement (the “New Credit Agreement”), which provides for:
	·	a $400.0 million first-lien, first-out three-year letter of credit facility (the “LC Facility”); and
	·	a $300.0 million first-lien, second-out five-year term loan (the “Term Loan”).
	Additionally, during April 2014, we completed the following new financing transactions:
	·	the issuance of $500.0 million of second-lien seven-year senior secured notes.
	·	the issuance of $287.5 million of tangible equity units composed of (1) three-year amortizing, senior unsecured notes, in an aggregate principal amount of $47.5 million, and (2) prepaid common stock purchase contracts.
	With the completion of these financing transactions in April 2014, we terminated the bridge loan commitment we had obtained from an affiliate of Goldman, Sachs, & Co. (“Goldman Sachs”). As a result of the termination of the bridge loan commitment, the fee we previously paid to Goldman Sachs to obtain the bridge loan commitment was recognized as interest expense in the first half of 2014. Due to the replacement of the Former Credit Agreement, the unamortized issuance fees related to the Former Credit Agreement were also recognized as interest expense in the first half of 2014. The total additional interest expense related to these items was approximately $28.0 million.
	The Former Credit Agreement provided for revolving credit borrowings and issuances of letters of credit in an aggregate outstanding amount of up to $950.0 million. Proceeds from borrowings under the Former Credit Agreement were available for working capital needs and other general corporate purposes. As of December 31, 2013, there were no borrowings outstanding, and letters of credit issued under the Former Credit Agreement totaled $214.3 million.  In addition, at December 31, 2013, we had $96.9 million in outstanding unsecured bilateral letters of credit.
	New Credit Facilities
	The indebtedness and other obligations under the New Credit Agreement are unconditionally guaranteed on a senior secured basis by substantially all of our wholly owned subsidiaries, other than our captive insurance subsidiary (collectively, the “Guarantors”). In connection with the New Credit Agreement, we paid certain fees to the lenders thereunder, as well as certain arrangement fees to the arrangers and agents for the New Credit Agreement, which we have capitalized and are amortizing to interest expense over the respective terms of the LC Facility and the Term Loan. We also paid certain fees to the initial purchasers of the senior secured notes and to the underwriter of the tangible equity units referred to below, which we have capitalized and are amortizing to interest expense over the respective terms of the related indebtedness.
	LC Facility and Cash-Collateralized Bilateral Letters of Credit
	The LC Facility provides for an initial letter of credit capacity of $400.0 million and allows for uncommitted increases in capacity of $100.0 million through December 31, 2014 and an additional $100.0 million thereafter, potentially increasing the total capacity to $600.0 million through the term of the LC Facility. Letters of credit issuable under the LC Facility support the obligations of McDermott and its affiliates and joint ventures. Financial letters of credit do not support ordinary course of business performance obligations or bids. The aggregate amount of the LC Facility available for financial letters of credit is capped at 25% of the total LC Facility. As of December 31, 2014, the aggregate face amount of letters of credit issued under the LC Facility was $195.8 million. There were no financial letters of credit issued under the LC facility as of December 31, 2014.
	In addition, the LC Facility permits us to deposit up to $300.0 million with letter of credit issuers to cash collateralize letters of credit issued on a bilateral basis outside the credit facility. As of December 31, 2014, we had an aggregate face amount of approximately $88.8 million of such letters of credit outstanding supported by cash collateral, including financial letters of credit of $19.7 million. We have included the supporting cash collateral in restricted cash and cash equivalents in the accompanying consolidated balance sheet as of December 31, 2014.
	The LC Facility is secured on a first-lien, first-out basis (with relative priority over the Term Loan) by pledges of the capital stock of all the Guarantors and mortgages on, or other security interests in, substantially all the tangible and intangible assets of our company and the Guarantors, subject to specific exceptions.
	The LC Facility contains various customary affirmative covenants, as well as specific affirmative covenants, including specific reporting requirements and a requirement for ongoing periodic financial reviews by a financial advisor. The LC Facility also requires compliance with various negative covenants, including limitations with respect to the incurrence of other indebtedness and liens, restrictions on acquisitions, capital expenditures and other investments, restrictions on sale/leaseback transactions and restrictions on prepayments of other indebtedness.
	The LC Facility requires us to generate consolidated earnings before interest, taxes, depreciation and amortization (“EBITDA”) of at least specified minimum amounts over the term of the facility. The LC Facility also requires us to maintain a ratio of fair market value of vessel collateral to the sum of (1) the outstanding principal amount of the Term Loan, (2) the aggregate amount of undrawn financial letters of credit outstanding under the LC Facility, (3) all drawn but unreimbursed letters of credit under the LC Facility, and (4) mark-to-market foreign exchange exposure that is not cash secured of at least 1.20:1.00. The LC Facility also specifies maximum capital expenditures over the term of the facility and requires us to maintain at least $200.0 million of minimum available cash, at the end of each quarter. We were in compliance with the covenants under the LC Facility as of December 31, 2014.
	The LC Facility provides for a commitment fee of 0.50% per year on the unused portion of the LC Facility and letter of credit fees at an annual rate of 2.25% for performance letters of credit and 4.50% for financial letters of credit, as well as customary issuance fees and other fees and expenses.
	Term Loan
	The Term Loan is secured on a first-lien, second-out basis (with the LC Facility having relative priority over the Term Loan) by pledges of the capital stock of all the Guarantors and mortgages on, or other security interests in, substantially all tangible and intangible assets of our company and the Guarantors, subject to specific exceptions. As of December 31, 2014, we had $298.5 million in borrowings outstanding under the Term Loan, of which $3.0 million was classified as current notes payable.
	The Term Loan requires mandatory prepayments from: (1) the proceeds from the sale of assets, as well as insurance proceeds, in each case subject to certain exceptions, to the extent such proceeds are not reinvested in our business within 365 days of receipt; (2) net cash proceeds from the incurrence of indebtedness not otherwise permitted under the New Credit Agreement; and (3) 50% of amounts deemed to be “excess cash flow,” subject to specified adjustments. The Term Loan also requires quarterly amortization payments equal to $750,000. The Term Loan also provides for a prepayment premium if we prepay or re-price the Term Loan prior to April 16, 2015.
	The Term Loan requires compliance with various customary affirmative and negative covenants. We must also maintain a ratio of “ownership adjusted fair market value” of marine vessels to the sum of (1) the outstanding principal amount of the Term Loan and (2) the aggregate principal amount of unreimbursed drawings and advances under the LC Facility of at least 1.75:1.00. As of December 31, 2014, we were in compliance with all of the covenants under the Term Loan.
	The Term Loan was incurred with 25 basis points of original issue discount and bears interest at a floating rate, which can be, at our option, either: (1) a LIBOR rate for a specified interest period (subject to a LIBOR “floor” of 1.00%) plus an applicable margin of 4.25%; or (2) an alternate base rate (subject to a base rate “floor” of 2.00%) plus an applicable margin of 3.25%.
	Senior Notes
	During April 2014 we issued $500.0 million in aggregate principal amount of 8.000% senior secured notes due 2021 (the “Notes”) in a private placement in accordance with Rule 144A and Regulation S under the Securities Act of 1933, as amended. Interest on the Notes is payable semi-annually in arrears on May 1 and November 1 of each year, beginning on November 1, 2014, at an annual rate of 8%. The Notes are scheduled to mature on May 1, 2021. As of December 31, 2014, there was $500.0 million principal amount of Senior Notes outstanding.
	The Notes are unconditionally guaranteed on a senior secured basis by the Guarantors, and the Notes are secured on a second-lien basis by pledges of capital stock of certain of our subsidiaries and mortgages and other security interests covering (1) specified marine vessels owned by certain of the Guarantors and (2) substantially all the other tangible and intangible assets of our company and the Guarantors, subject to exceptions for certain assets.
	At any time, or from time to time, on or after May 1, 2017, at our option, we may redeem the Notes, in whole or in part, at the redemption prices (expressed as percentages of principal amount of the Notes to be redeemed) set forth below, together with accrued and unpaid interest to the redemption date, if redeemed during the 12-month period beginning May 1 of the years indicated:
	Year		Percentage
	2017			104	%
	2018			102	%
	2019 and thereafter			100	%
	The indenture governing the Notes contains covenants that, among other things, limit our ability and the ability of our restricted subsidiaries to: (1) incur or guarantee additional indebtedness or issue preferred stock; (2) make investments or certain other restricted payments; (3) pay dividends or distributions on capital stock or purchase or redeem subordinated indebtedness; (4) sell assets; (5) create restrictions on the ability of our restricted subsidiaries to pay dividends or make other payments to us; (6) create certain liens; (7) sell all or substantially all of our assets or merge or consolidate with or into other companies; (8) enter into transactions with affiliates; and (9) create unrestricted subsidiaries. Many of those covenants would become suspended if the Notes were to attain an investment grade rating from both Moody’s Investors Service, Inc. and Standard and Poor’s Ratings Services and no default has occurred.
	Tangible Equity Units
	During April 2014, we issued 11,500,000 6.25% tangible equity units (“Units”), each with a stated amount of $25.00. Each Unit consists of (1) a prepaid common stock purchase contract and (2) a senior amortizing note due April 1, 2017 (each an “Amortizing Note”) that has an initial principal amount of $4.1266 per Amortizing Note, bears interest at a rate of 7.75% per annum and has a final scheduled installment payment date of April 1, 2017.
	The prepaid common stock purchase contracts were accounted for as additional paid-in capital totaling $240.0 million. As of December 31, 2014, the Amortizing Notes were recorded as long-term debt totaling $40.5 million, of which $15.3 million was classified as current notes payable.
	Each prepaid common stock purchase contract will automatically settle on April 1, 2017, unless settled earlier: (1) at the holder’s option, upon which we will deliver shares of our common stock, based on the applicable settlement rate and applicable market value of our stock as determined under the purchase contract; or (2) at our option, upon which we will deliver shares of our common stock, based upon the stated maximum settlement rate of 3.5562 shares per Unit, subject to adjustment. Potential dilutive common shares that may be issued for the settlement of the common stock purchase contracts totaled 40.9 million at December 31, 2014, based on the maximum number of shares issuable per Unit. The potential minimum number of shares issuable is 33.4 million, which represents 2.9030 per Unit. The maximum and minimum settlement rates for the Units are subject to adjustment for certain dilutive events.
	North Ocean Financing
	NO 105
	On September 30, 2010, MII, as guarantor, and North Ocean 105 AS, in which we have a 75% ownership interest, as borrower, entered into a financing agreement to finance a portion of the construction costs of the NO105. The agreement provides for borrowings of up to $69.4 million, bearing interest at 2.76% per year, and requires principal repayment in 17 consecutive semi-annual installments, which commenced on October 1, 2012. Borrowings under the agreement are secured by, among other things, a pledge of all of the equity of North Ocean 105 AS, a mortgage on the NO 105, and a lien on substantially all of the other assets of North Ocean 105 AS. MII unconditionally guaranteed all amounts to be borrowed under the agreement. As of December 31, 2014 and December 31, 2013, there was $49.0 million and $57.2 million, respectively, in borrowings outstanding under this agreement, of which (as of each date) approximately $8.2 million was classified as current notes payable.
	NO 102
	In December 2009, JRMSA entered into a vessel-owning joint venture transaction with Oceanteam ASA and, as a result, we have included notes payable of these entities on our consolidated balance sheets. JRMSA had guaranteed approximately 50% of this debt based on its ownership percentages in the vessel-owning companies. The outstanding debt bore interest at a rate equal to the three-month LIBOR (which was subject to reset every three months) plus a margin of 3.315%.  JRMSA exercised its option to purchase Oceanteam ASA’s 50% ownership interest in the vessel-owing companies in December 2014 for $32.9 million (see Note 2). As of December 31, 2013, we reported consolidated notes payable of $31.4 million on our consolidated balance sheet, all of which was classified as current notes payable and paid in full in early 2014.
	Unsecured Bilateral Letters of Credit and Bank Guarantees
	In 2012, McDermott Middle East, Inc. and MII executed a general reimbursement agreement in favor of a bank located in the UAE relating to issuances of bank guarantees in support of contracting activities in the Middle East and India. As of December 31, 2014 and December 31, 2013, bank guarantees issued under these arrangements totaled $56.2 million and $55.8 million, respectively. In 2007 and in 2012, JRMSA and MII executed general unsecured reimbursement agreements in favor of three institutions that were lenders under the Former Credit Agreement relating to issuances of letters of credit in support of contracting activities, primarily in Asia and the Middle East. Letters of credit issued under two of these arrangements have either been replaced by letters of credit under the LC Facility or cash collateralized. The letters of credit issued under these arrangements totaled $39.8 million as of December 31, 2013. There were no letters of credit issued under these arrangements as of December 31, 2014. -
	On April 20, 2012, McDermott and one of its wholly owned subsidiaries, McDermott Australia Pty. Ltd. (“McDermott Australia”), entered into a secured Letter of Credit Reimbursement Agreement (the “Reimbursement Agreement”) with Australia and New Zealand Banking Group Limited (“ANZ”). In accordance with the terms of the Reimbursement Agreement, ANZ issued letters of credit in the aggregate amount of approximately $109.0 million to support McDermott Australia’s performance obligations under contractual arrangements relating to a field development project. The obligations of McDermott and McDermott Australia under the Reimbursement Agreement are secured by McDermott Australia’s interest in the contractual arrangements and certain related assets. During the year ended December 31, 2014, we replaced these letters of credit with letters of credit and cash collateralized letters of credit under the LC Facility.
	Surety Bonds
	In 2012 and 2011, MII executed general agreements of indemnity in favor of surety underwriters based in Mexico relating to surety bonds issued in support of contracting activities of J. Ray McDermott de Mèxico, S.A. de C.V. and McDermott, Inc., both subsidiaries of MII. As of December 31, 2014 and December 31, 2013, bonds issued under these arrangements totaled $52.5 million and $43.5 million, respectively. In October 2013, MII executed general agreements of indemnity in favor of surety underwriters relating to surety bonds in support of vessels operating in Brazil. The project requiring these bonds was completed during the year ended December 31, 2014, allowing us to cancel the outstanding bonds. Accordingly, as of December 31, 2014, there were no bonds issued under these arrangements. As of December 31, 2013, the bonds issued under these arrangements totaled $106.3 million.
	Long-term debt and notes payable obligations
	A summary of our long-term debt obligations are as follows:
		December 31,				December 31,
		2014				2013
		(In thousands)
	Long-term debt consists of:
	Senior Notes	$	500,000			$	—
	Term Loan		298,500				—
	NO 105 Construction Financing		49,019				57,189
	Amortizing Notes		40,483				—
	Capital lease obligation		2,802				—
	Other financing		743				—
	NO 102 Construction Financing		—				31,373
		$	891,547			$	88,562
	Less: Amounts due within one year		27,026				39,543
	Total long-term debt	$	864,521			$	49,019
	Maturities of long-term debt during the five years subsequent to December 31, 2014 are as follows:
		(In thousands)
2015	$	27,026
2016		28,274
2017		20,558
2018		11,616
2019		295,903
Thereafter		508,170
Total	$	891,547

PENSION_PLANS_AND_POSTRETIREME

PENSION PLANS AND POSTRETIREMENT BENEFITS	12 Months Ended
	Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]
PENSION PLANS AND POSTRETIREMENT BENEFITS	NOTE 4—PENSION PLANS AND POSTRETIREMENT BENEFITS
	Although we currently provide retirement benefits for most of our U.S. employees through sponsorship of the McDermott Thrift Plan (see “Defined Contribution Plans” below), some of our longer-term U.S. employees and former employees are entitled to retirement benefits under the McDermott (U.S.) Retirement Plan, a non-contributory qualified defined benefit pension plan (the “McDermott Plan”), and several non-qualified supplemental defined benefit pension plans. The McDermott Plan and the non-qualified supplemental defined benefit pension plans are collectively referred to herein as the “Domestic Plans.” The McDermott Plan has been closed to new participants since 2006, and benefit accruals under the McDermott Plan were frozen completely in 2010.
	We also sponsor a defined benefit pension plan established under the laws of the Commonwealth of the Bahamas, the J. Ray McDermott, S.A. Third Country National Employees Pension Plan (the “TCN Plan”) which provides retirement benefits for certain of our current and former foreign employees. Effective August 1, 2011, new entry into the TCN Plan was closed, and effective December 31, 2011, benefit accruals under the TCN Plan were frozen. Effective January 1, 2012, we established a new global defined contribution plan to provide retirement benefits to non-U.S. expatriate employees who may have otherwise obtained benefits under the TCN Plan.
	Retirement benefits under the McDermott Plan and the TCN Plan are generally based on final average compensation and years of service, subject to the applicable freeze in benefit accruals under the plans. Our funding policy is to fund the plans as recommended by the respective plan actuaries and in accordance with the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), or other applicable law. The Pension Protection Act of 2006 (“PPA”) amended ERISA and modified the funding requirements for certain defined benefit pension plans including the McDermott Plan. Funding provisions under the PPA accelerated funding requirements are applicable to the McDermott Plan to ensure full funding of benefits accrued.
	As described in Note 1, we elected to change our accounting method for recognizing actuarial gains and losses for our pension and other postretirement benefit plans. Accordingly, we have made revisions to previously disclosed amounts, specifically net periodic benefit cost and accumulated other comprehensive income (loss), where certain amounts have been reclassified to retained earnings.
		Domestic Plans						TCN Plan
		Year Ended						Year Ended
		December 31,						December 31,
		2014			2013			2014			2013
		(In thousands)
	Change in benefit obligation:
	Benefit obligation at beginning of year	$	583,421		$	615,361		$	40,396		$	48,009
	Interest cost		26,972			23,996			1,900			1,867
	Actuarial loss (gain)		36,885			(25,137	)		4,438			(5,860	)
	Terminated Vested Employees Lump Sum Settlement (1)		(54,551	)		—			—			—
	Curtailments and other adjustments		—			3,850			—			(621	)
	Benefits paid		(36,095	)		(34,649	)		(2,749	)		(2,999	)
	Benefit obligation at end of year	$	556,632		$	583,421		$	43,985		$	40,396
	Change in plan assets:
	Fair value of plan assets at beginning of year		567,801			605,892			43,483			39,039
	Actual return on plan assets		73,114			(4,982	)		1,372			6,943
	Company contributions		1,552			1,540			—			500
	Terminated Vested Employees Lump Sum Settlement(1)		(54,551	)		—			—			—
	Benefits paid		(36,095	)		(34,649	)		(2,749	)		(2,999	)
	Fair value of plan assets at end of year		551,821			567,801			42,106			43,483
	Funded status	$	(4,811	)	$	(15,620	)	$	(1,879	)	$	3,087
	Amounts recognized in balance sheet consist of:
	Other Assets	$	12,685		$	598		$	—		$	3,087
	Accrued pension liability—current		(1,519	)		(1,519	)		—			—
	Pension liability		(15,977	)		(14,699	)		(1,879	)		—
	Accrued benefit liability		(17,496	)		(16,218	)		(1,879	)		—
	Net (Liability)/ Asset	$	(4,811	)	$	(15,620	)	$	(1,879	)	$	3,087
	-1	During the year ended December 31, 2014 we offered our former employees with vested pension benefits under the McDermott Plan a one-time voluntary opportunity, for a six-week period, to receive the value of their pension benefit as a lump-sum payment. This program resulted in a $54.6 million release of pension liability and a corresponding decrease in plan assets.
		Domestic Plans						TCN Plan
		Year Ended						Year Ended
		December 31,						December 31,
		2014			2013			2014			2013
		(In thousands)
	Supplemental information:
	Plans with accumulated benefit obligation in excess of plan assets
	Projected benefit obligation	$	556,632		$	583,421		$	43,985		$	40,396
	Accumulated benefit obligation	$	556,632		$	583,421		$	43,985		$	40,396
	Fair value of plan assets	$	551,821		$	567,801		$	42,106		$	43,483
	Assumptions
		Domestic Plans						TCN Plan
		2014			2013			2014			2013
	Weighted average assumptions used to determine net periodic benefit obligations at December 31:
	Discount rate		4	%		4.8	%		3.8	%		4.8	%
	Rate of compensation increase		N/A			N/A			N/A			N/A
		Domestic Plans									TCN Plan
		Year Ended									Year Ended
		December 31,									December 31,
		2014			2013			2012			2014			2013			2012
		(In thousands)
	Supplemental information:
	Components of periodic benefit cost:
	Interest cost	$	26,972		$	23,996		$	26,521		$	1,900		$	1,867		$	1,843
	Expected return on plan assets		(27,501	)		(38,306	)		(35,809	)		(2,961	)		(2,602	)		(2,443	)
	Current period (gain) loss		(8,728	)		22,002			19,580			6,027			(10,822	)		3,998
	Net periodic benefit (gain) cost	$	(9,257	)	$	7,692		$	10,292		$	4,966		$	(11,557	)	$	3,398
	Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31:
	Discount rate		4.8	%		4	%		4.8	%		4.8	%		4	%		4.8	%
	Expected return on plan assets		5	%		6.5	%		6.5	%		6.9	%		6.9	%		6.9	%
	Rate of compensation increase		N/A			N/A			N/A			N/A			N/A			N/A
As of December 31, 2014, we reassessed the assumptions for expected rates of return on plan assets based on current conditions and our investment strategies, resulting in a reduction of the rate of return to 5.0% for the Domestic Plans with no change to the 6.9%rate of return for the TCN Plan. The expected rate of return is determined to be the weighted average of the nominal returns based on the weightings of the asset classes within the McDermott Trust and TCN Trust investment portfolios. In setting these rates, we used a building-block approach. Historic real return trends for the various asset classes in both investment portfolios were combined with anticipated future market conditions to estimate the real rate of return for each class. These rates were then adjusted for anticipated future inflation to determine estimated nominal rates of return for each class.
Investment Goals
General
The investment goals of the McDermott Trust and the trust underlying the TCN Plan (“TCN Trust”) are generally to provide for the solvency of the respective plans and fulfillment of pension obligations over time, and to maximize long-term investment return consistent with a reasonable level of risk. Asset allocations within the McDermott Trust and TCN Trust are reviewed periodically and rebalanced, if appropriate, to ensure the continued conformance to the investment goals, objectives and strategies. Both the McDermott Trust and the TCN Trust employ a professional investment advisor and a number of professional investment managers whose individual benchmarks are, in the aggregate, consistent with the applicable trust’s overall investment objectives.
The specific goals of each investment manager are set out in the investment policy adopted by the investment committee for the respective trust, but, in general, the goals are (1) to perform in line with (in the case of passive accounts) or outperform (for actively managed accounts) the benchmark selected and agreed upon by the manager and the trust, and (2) to display an overall level of risk in its portfolio that is consistent with the risk associated with the agreed upon benchmark. The estimated allocations discussed below are periodically reviewed to assess the appropriateness of the particular funds in which they are invested, and these estimated allocations are subject to change.
The performance of each investment manager’s portfolio is periodically measured against commonly accepted benchmarks, including the individual investment manager’s benchmarks. In evaluating investment manager performance, consideration is also given to personnel, strategy, research capabilities, organizational and business matters, adherence to discipline and other qualitative factors that may impact the ability to achieve desired investment results.
The following is a summary of the asset allocations at December 31, 2014 and 2013 by asset category. The estimated allocation for 2015, by asset class, is expected to remain approximately the same as the year ended December 31, 2014.
	Domestic Plans						TCN Plan
	2014			2013			2014			2013
Asset Category:
Fixed Income		85	%		85	%		28	%		25	%
Equity Securities		15	%		15	%		72	%		75	%
Total		100	%		100	%		100	%		100	%
Fair Value
The following is a summary of total investments for our plans, measured at fair value at December 31, 2014 and 2013.
	12/31/14			Level 1			Level 2			Level 3
	(In thousands)
Pension Benefits:
Fixed Income	$	471,704		$	64,575		$	402,116		$	5,013
Equities	$	110,267			109,781			486		—
Cash and Accrued Items	$	11,956			11,956		—			—
Total Investments	$	593,927		$	186,312		$	402,602		$	5,013
	12/31/13			Level 1			Level 2			Level 3
	(In thousands)
Pension Benefits:
Fixed Income	$	479,529		$	58,556		$	417,204		$	3,769
Equities	$	119,669			31,687			87,982		—
Cash and Accrued Items	$	12,086			12,086		—			—
Total Investments	$	611,284		$	102,329		$	505,186		$	3,769
Changes in Level 3 Instrument
The following is a summary of the changes in our Level 3 fixed income instruments measured on a recurring basis for the years ended December 31, 2014 and 2013:
	December 31,
	2014			2013
	(In thousands)
Balance at beginning of period	$	3,769		$	1,576
Purchases, net		1,347			2,120
Total unrealized gains (loss)		(103	)		73
Balance at end of period	$	5,013		$	3,769
Cash Flows
Cash Flows
	Domestic Plans			TCN Plan
	(In thousands)
Expected employer contributions to trusts of defined benefit plans:
2015	—			—
Expected benefit payments:
2015	$	37,344		$	2,379
2016	$	37,288		$	2,799
2017	$	37,060		$	2,690
2018	$	36,887		$	2,498
2019	$	36,633		$	2,604
2020-2024	$	178,455		$	11,540
Defined Contribution Plans
We provide retirement benefits for most of our U.S. employees through the McDermott Thrift Plan, a qualified defined contribution plan with a Code section 401(k) feature (the “Thrift Plan”). The Thrift Plan generally provides for matching employer contributions of 50% of participants’ contributions up to 6% of compensation and unmatched employer cash contributions equal to 3% of participants’ base pay, plus overtime pay, expatriate pay and commissions, which we refer to collectively as “thriftable earnings.” Amounts charged to expense for employer contributions under the Thrift Plan totaled approximately $3.9 million, $6.4 million and $6.8 million in the years ended December 31, 2014, 2013 and 2012, respectively.
We provide retirement benefits for some of our international employees through the McDermott Global Defined Contribution Plan (the “Global Thrift Plan”), a defined contribution plan established on January 1, 2012 and operated under Luxembourg law. The Global Thrift Plan generally provides for matching employer contributions of 50% of participants’ contributions up to 6% of base salary and unmatched employer cash contributions equal to 3% of participants’ base salary. Amounts charged to expense for employer contributions under the Global Thrift Plan totaled approximately $1.2 million, $1.6 million and $1.6 million in the years ended December 31, 2014, 2013 and 2012, respectively.
We also provide benefits under the McDermott International, Inc. Director and Executive Deferred Compensation Plan (“Deferred Compensation Plan”), which is a non-qualified defined contribution plan. Expense associated with the Deferred Compensation Plan was not material to the consolidated financial statements for the years presented.

INVESTMENTS

INVESTMENTS	12 Months Ended
	Dec. 31, 2014
Investments Debt And Equity Securities [Abstract]
INVESTMENTS	NOTE 5—INVESTMENTS
	As of December 31, 2014, we had investments with a fair value of $3.9 million. Our investment portfolio consists of investments in commercial paper and mutual funds. Our investments are classified as available-for-sale and are carried at fair value with unrealized gains and losses, net of tax, reported as a component of other comprehensive income (loss). During the year ended December 31, 2013, we recognized other than temporary impairment of $1.6 million on the asset-backed securities and collateralized mortgage obligations. Our net unrealized gain on investments was $0.2 million as of December 31, 2014 and December 31, 2013.
	As of December 31, 2014, investments in commercial paper were classified as short-term and were included in other current assets in the consolidated balance sheet.
	The following is a summary of our available-for-sale securities:
		Year Ended December 31, 2014
		Amortized Cost		Gross Unrealized Gains		Estimated Fair Value
		(In thousands)
	Mutual funds(1)	$	1,975	$	241	$	2,216
	Commercial paper(2)		1,699		—	$	1,699
		$	3,674	$	241	$	3,915
		Year Ended December 31, 2013
		Amortized Cost		Gross Unrealized Gains		Estimated Fair Value
		(In thousands)
	Mutual funds(1)	$	1,975	$	198	$	2,173
	Commercial paper(2)		3,699		—	$	3,699
	Asset-backed securities and collateralized mortgage obligations(3)(4)(5)		7,599		40	$	7,639
		$	13,273	$	238	$	13,511
	-1	Various U.S. equities and other investments managed under mutual funds.
	-2	Commercial paper with maturities less than one year.
	-3	Included in our asset-backed securities and collateralized mortgage obligations is approximately $5.6 million of commercial paper secured by mortgage-backed securities.
	-4	Asset-backed and mortgage-backed securities with maturities of up to 26 years.
	-5	Asset-backed and mortgage-backed securities and collateralized mortgage obligations is net of a $1.6 million impairment that was recognized in the year ended December 31, 2013.
	Proceeds, gross realized gains and gross realized losses from sales and maturities of available-for-sale securities were as follows:
		Proceeds		Gross Realized Gains		Gross Realized Losses
		(In thousands)
	Year Ended December 31, 2014	$	12,978	$	—	$	(326	)
	Year Ended December 31, 2013	$	43,959	$	—	$	—
	Year Ended December 31, 2012	$	191,298	$	—	$	—

DERIVATIVE_FINANCIAL_INSTRUMEN

DERIVATIVE FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	NOTE 6—DERIVATIVE FINANCIAL INSTRUMENTS
	We enter into derivative financial instruments primarily to hedge certain firm purchase or sale commitments and forecasted transactions denominated in foreign currencies. We record these contracts at fair value on our consolidated balance sheets. Depending on the hedge designation at the inception of the contract, the related gains and losses on these contracts are either: (1) deferred as a component of AOCI until the hedged item is recognized in earnings; (2) offset against the change in fair value of the hedged firm commitment through earnings; or (3) recognized immediately in earnings. At inception and on an ongoing basis, we assess the hedging relationship to determine its effectiveness in offsetting changes in cash flows or fair value attributable to the hedged risk. We exclude from our assessment of effectiveness the portion of the fair value of the forward contracts attributable to the difference between spot exchange rates and forward exchange rates. The ineffective portion of a derivative’s change in fair value and any portion excluded from the assessment of effectiveness are immediately recognized in earnings. Gains and losses on derivative financial instruments that are immediately recognized in earnings are included as a component of gain (loss) on foreign currency-net in our consolidated statements of operations. At December 31, 2014, we had designated the majority of our foreign currency forward contracts as cash flow hedging instruments.
	As of December 31, 2014, we had deferred approximately $82.8 million of net losses on these derivative financial instruments in AOCI, and we expect to reclassify approximately $61.9 million of the net deferred losses out of AOCI by December 31, 2015.
	As of December 31, 2014, the majority of our derivative financial instruments consisted of foreign currency forward contracts. The notional value of our outstanding derivative contracts totaled $844.3 million at December 31, 2014, with maturities extending to October 2017. Of this amount, approximately $534.4 million is associated with various foreign currency expenditures we expect to incur on one of our ASA segment EPCI projects. These instruments consist of contracts to purchase or sell foreign-denominated currencies. As of December 31, 2014, the fair value of these contracts was in a net liability position totaling $46.9 million. The fair value of outstanding derivative instruments is determined using observable financial market inputs, such as quoted market prices, and is classified as Level 2 in nature.
	The following tables summarize our derivative financial instruments:
	Asset and Liability Derivatives
		December 31,			December 31,
		2014			2013
		(in thousands)
	Derivatives Designated as Hedges:
	Location:
	Accounts receivable-other	$	1,173		$	11,641
	Other assets		16			1,647
	Total asset derivatives	$	1,189		$	13,288
	Accounts payable	$	32,431		$	20,209
	Other liabilities		15,670			21,846
	Total liability derivatives	$	48,101		$	42,055
	The Effects of Derivative Instruments on our Financial Statements
		December 31,
		2014			2013
		(in thousands)
	Derivatives Designated as Hedges:
	Amount of gain/(loss) recognized in AOCI	$	(65,503	)	$	(52,781	)
	Income (loss)  reclassified from AOCI into income: effective portion
	Location
	Cost of operations	$	26,418		$	1,715
	Gain(loss) recognized in income (loss): ineffective portion and amount excluded from effectiveness testing
	Location
	Gain (loss) on foreign currency—net	$	6,910		$	13,247
	Credit Risk
	In the event of nonperformance by counterparties to our derivative financial instruments, we may be exposed to credit-related losses. However, when possible, we enter into International Swaps and Derivative Association agreements with our derivative counterparties to mitigate this risk. We also attempt to mitigate this risk by using highly-rated major financial institutions as counterparties. Our derivative counterparties have the benefit of the same collateral arrangements and covenants as described under our Credit Agreement.

FAIR_VALUES_OF_FINANCIAL_INSTR

FAIR VALUES OF FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
FAIR VALUES OF FINANCIAL INSTRUMENTS	NOTE 7—FAIR VALUES OF FINANCIAL INSTRUMENTS
	The valuation methodologies we use to measure the fair values of our derivatives and available-for-sale securities are as follows:
	Derivatives
	Level 2 derivative assets and liabilities primarily include over-the-counter forward contracts, largely consisting of foreign currency derivative instruments. Where applicable, the value of these derivative assets and liabilities is computed by discounting the projected future cash flow amounts to present value using market-based observable inputs, including foreign exchange forward and spot rates, interest rates and counterparty performance risk adjustments.
	At December 31, 2014, we had forward contracts outstanding to purchase or sell foreign currencies with a total notional value of $844.3 million and a total liability position fair value of $46.9 million.
	Available-for-Sale Securities
	The following is a summary of our available-for-sale securities measured at fair value:
		31-Dec-14
		Total				Level 1				Level 2				Level 3
		(in thousands)
	Mutual funds(1)	$	2,216			$	—			$	2,216			$	—
	Commercial paper		1,699				—				1,699				—
	Total	$	3,915			$	—			$	3,915			$	—
		31-Dec-13
		Total				Level 1				Level 2				Level 3
		(in thousands)
	Mutual funds(1)	$	2,173			$	—			$	2,173			$	—
	Commercial paper		3,699				—				3,699				—
	Asset-backed securities and collateralized mortgage obligations(2)		7,639				—				2,082				5,557
	Total	$	13,511			$	—			$	7,954			$	5,557
	-1	Various U.S. equities and other investments managed under mutual funds
	-2	Asset-backed and mortgage-backed securities with maturities of up to 26 years
	Our Level 2 investments consist primarily of commercial paper, asset-backed commercial paper notes backed by a pool of mortgage-backed securities and mutual funds. The fair value of our Level 2 investments was determined using a market approach which is based on quoted prices and other information for similar or identical instruments.
	Our Level 3 investment consists of asset-backed commercial paper notes backed by a pool of mortgage-backed securities. The fair value of this Level 3 investment was based on the calculation of an overall weighted-average valuation, using the prices of the underlying individual securities. Individual securities in the pool were valued based on market observed prices, where available. If market prices were not available, prices of similar securities backed by similar assets were used.
	Changes in Level 3 Instrument
	The following is a summary of the changes in our Level 3 instrument measured on a recurring basis for the years ended December 31, 2014 and 2013:
		December 31,
		2014				2013
		(in thousands)
	Balance at beginning of period	$	5,557			$	6,343
	Total realized and unrealized gains (losses)		(375	)			484
	Sales and principal repayments		(5,182	)			(1,270	)
	Balance at end of period	$	—			$	5,557
	Other Financial Instruments
	We used the following methods and assumptions in estimating our fair value disclosures for our other financial instruments:
	Cash and cash equivalents and restricted cash and cash equivalents. The carrying amounts that we have reported in the accompanying consolidated balance sheets for cash, cash equivalents and restricted cash and cash equivalents approximate their fair values and are classified as Level 1 within the fair value hierarchy.
	Short-term and long-term debt. The fair value of debt instruments is classified as Level 2 within the fair value hierarchy and is valued using a market approach based on quoted prices for similar instruments traded in active markets. Where quoted prices are not available, the income approach is used to value these instruments based on the present value of future cash flows discounted at estimated borrowing rates for similar debt instruments or on estimated prices based on current yields for debt issues of similar quality and terms.
	Forward contracts. The fair value of forward contracts is classified as Level 2 within the fair value hierarchy and is valued using observable market parameters for similar instruments traded in active markets. Where quoted prices are not available, the income approach is used to value forward contracts, which discounts future cash flows based on current market expectations and credit risk.
	The estimated fair values of certain of our financial instruments are as follows:
			31-Dec-14								31-Dec-13
			Carrying				Fair Value				Carrying				Fair Value
			Amount								Amount
			(In thousands)
	Balance Sheet Instruments
	Cash and cash equivalents		$	665,309			$	665,309			$	118,702			$	118,702
	Restricted cash and cash equivalents		$	187,585			$	187,585			$	23,652			$	23,652
	Investments		$	3,915			$	3,915			$	13,511			$	13,511
	Debt		$	(891,547	)		(737,980		)		$	(88,562	)		$	(90,005	)
	Forward contracts		$	(46,912	)		$	(46,912	)		$	(28,767	)		$	(28,767	)
	See Note 1 “Basis of Presentation and Significant Accounting Policies—Impairment Review,” for a description of significant Level 3 inputs used in development of fair value of nonfinancial assets during the year ended December 31, 2014.

STOCKBASED_COMPENSATION

STOCK-BASED COMPENSATION	12 Months Ended
	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
STOCK-BASED COMPENSATION	NOTE 8—STOCK-BASED COMPENSATION
	Equity instruments are measured at fair value on the grant date. Stock-based compensation expense is generally recognized on a straight-line basis over the requisite service periods of the awards. Compensation expense is based on awards we expect to ultimately vest. Therefore, we have reduced compensation expense for estimated forfeitures based on our historical forfeiture rates. Our estimate of forfeitures is determined at the grant date and is revised if our actual forfeiture rate is materially different from our estimate.
	Total compensation expense recognized for the years ended December 31, 2014, 2013 and 2012 was as follows:
			December 31,
			2014				2013				2012
			(In thousands)
	Stock options		$	1,747			$	4,321			$	3,984
	Restricted stock and restricted stock units			14,417				12,326				6,880
	Performance shares			352				4,453				4,505
	Total		$	16,516			$	21,100			$	15,369
	Included in stock-based compensation expense, net is a reversal of prior recognized expense resulting from personnel severance arrangements of $2.0 million for the year ended December 31, 2014, which is reflected in restructuring expenses in the consolidated statement of operations.
	As of December 31, 2014, total unrecognized estimated compensation expense related to nonvested awards was $26.8 million.
	The components of the total gross unrecognized estimated compensation expense and their expected remaining weighted-average periods for expense recognition are as follows (amounts in thousands; periods in years):
			Amount				Weighted-Average Period
	Stock options		$	1,457				1.1
	Restricted stock and restricted stock units		$	21,164				2.1
	Performance shares		$	4,140				1.9
	Stock Plans
	2014 McDermott International, Inc. Long-Term Incentive Plan
	In May 2014, our shareholders approved the 2014 LTIP. Members of the Board of Directors, officers, employees and consultants are eligible to participate in the plan. The Compensation Committee of the Board of Directors selects the participants for the plan. The plan provides for a number of forms of stock-based compensation, including incentive and non-qualified stock options, restricted stock, restricted stock units and performance shares and performance share units, subject to satisfaction of specific performance goals. Shares approved under the 2009 McDermott International, Inc. Long-Term Incentive Plan (the “2009 LTIP”) that were not awarded as of the date of approval of the 2014 LTIP, or shares that are subject to awards that are cancelled, terminated, forfeited, expired or settled in cash in lieu of shares, are available for issuance under the 2014 LTIP. As part of the approval of the 2014 LTIP, 6,600,000 shares were authorized for issuance.
	2009 McDermott International, Inc. Long-Term Incentive Plan
	We no longer issue awards under the 2009 LTIP. Members of the Board of Directors, executive officers and key employees were eligible to participate in the plan. The Compensation Committee of the Board of Directors selected the participants for the plan. The plan provided for a number of forms of stock-based compensation, including incentive and non-qualified stock options, restricted stock, restricted stock units and performance shares and performance units, subject to satisfaction of specific performance goals. Shares approved under the 2001 Directors and Officers Long-Term Incentive Plan (the “2001 LTIP”) that were not awarded as of the date of approval of the 2009 LTIP, or shares that were subject to awards that were cancelled, terminated, forfeited, expired or settled in cash in lieu of shares, were available for issuance under the 2009 LTIP. As part of the approval of the 2009 LTIP, 9,000,000 shares were authorized for issuance. Options to purchase shares were granted at the fair market value (closing trading price) on the date of grant, became exercisable at such time or times as determined when granted and expired not more than seven years after the date of grant.
	2001 Directors and Officers Long-Term Incentive Plan
	We no longer issue awards under the 2001 LTIP. Members of the Board of Directors, executive officers, key employees and consultants were eligible to participate in the 2001 LTIP. The Compensation Committee of the Board of Directors selected the participants for the plan. The plan provided for a number of forms of stock-based compensation, including incentive and nonqualified stock options, stock appreciation rights, restricted stock, deferred stock units, performance shares and performance units, subject to satisfaction of specific performance goals. Options to purchase shares were granted at not less than 100% of the fair market value (average of the high and low trading price) on the date of grant, became exercisable at such time or times as determined when granted and expire not more than seven years after the date of the grant. Options granted prior to May 2009 expire not more than ten years after the date of the grant. Shares of common stock available to be awarded under the 2001 LTIP are available under the terms of the 2009 LTIP and have been included in the amount available for grant discussed above.
	Thrift Plan
	On November 12, 1991, 15,000,000 of the authorized and unissued shares of common stock were reserved for issuance for the employer match to the Thrift Plan. On October 11, 2002, an additional 15,000,000 of the authorized and unissued shares of common stock were reserved for issuance for the employer match to the Thrift Plan. Those employer matching contributions equal 50% of the first 6% of compensation, as defined in the Thrift Plan, contributed by participants, and fully vest and are nonforfeitable after three years of service or upon retirement, death, involuntary termination of employment due to reduction in force or approved disability. Effective June 2010, we began making employer matching contributions in cash, in lieu of shares of common stock. Accordingly, there were no shares issued under the Thrift Plan during the years ended December 31, 2014, 2013 and 2012.
	In the event of a change in control of our company, all of these stock-based compensation programs have provisions that may cause restrictions to lapse with respect to restricted stock units and accelerate the exercisability of outstanding options.
	Stock Options
	The fair value of each option grant was estimated with the following weighted-average assumptions:
			Year Ended December 31,
			2014		2013				2012
	Risk-free interest rate		—			0.68	%			0.77	%
	Expected volatility		—			56	%			59	%
	Expected life of the option in years		—			4.6				4.6
	Expected dividend yield		—			0	%			0	%
	The risk-free interest rate is based on the implied yield on a U.S. Treasury zero-coupon issue with a remaining term equal to the expected life of the option. The expected volatility is based on implied volatility from publicly traded options on our common stock, historical volatility of the price of our common stock and other factors. The expected life of the option is based on observed historical patterns. The expected dividend yield is zero based on the projected annual dividend payment. This amount is zero because we have not paid cash dividends historically and do not expect to pay cash dividends for the foreseeable future, although management continues to review and may elect to change this practice.
	The following table summarizes activity for our stock options for the year ended December 31, 2014 (share data in thousands):
			Number of Option Shares				Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
													(in millions)
	Outstanding at beginning of period			3,762			$	11.78
	Granted			—				—
	Exercised			(169	)			2.14
	Cancelled/expired/forfeited			(300	)			12.75
	Outstanding at end of period(1)			3,293			$	12.18			3.3 Years		$	0
	Exercisable at end of period			2,521			$	12.47			2.8 Years		$	0
	-1	Of the remaining outstanding options at the end of the period, we expect approximately 0.7 million shares underlying the options to vest at a weighted-average exercise price of $11.27.
	The aggregate intrinsic value included in the table above represents the total intrinsic value that would have been received by the option holders had all option holders exercised their options on December 31, 2014. The intrinsic value is calculated as the total number of option shares multiplied by the excess of the closing price of our common stock on the last trading day over the exercise price of the options. This amount changes based on the fair market value of our common stock.
	During the years ended December 31, 2014, 2013 and 2012, the total intrinsic value of stock options exercised was $0.9 million, $0.5 million and $1.9 million, respectively. We recorded cash received in the years ended December 31, 2014, 2013 and 2012 from the exercise of these stock options totaling $0.6 million, $0.3 million and $1.4 million, respectively. The weighted-average fair value of the stock options granted in the years ended December 31, 2013 and 2012 was $4.78 and $6.93, respectively. The total fair value of shares vested during the years ended December 31, 2014, 2013 and 2012 was $4.4 million, $3.7 million and $3.6 million, respectively.
	There were no tax benefits realized related to stock options exercised during the years ended December 31, 2014, 2013 and 2012.
	Restricted Stock and Restricted Stock Units
	Nonvested restricted stock and restricted stock units and changes during the year ended December 31, 2014 were as follows (share data in thousands):
			Number of Shares				Weighted-Average Grant Date Fair Value
	Nonvested at beginning of period			3,767			$	9.18
	Granted			2,536				7.56
	Vested			(1,097	)			10.69
	Cancelled/forfeited			(558	)			8.66
	Nonvested at end of period			4,648			$	8
	There were no tax benefits realized related to restricted stock and restricted stock units lapsed during the years ended December 31, 2014 and 2013.
	Performance Shares
	Nonvested performance share awards and changes during the year ended December 31, 2014 were as follows (share data in thousands):
			Number of Shares				Weighted-Average Grant Date Fair Value
	Nonvested at beginning of period			1,168			$	13.7
	Granted			626				7.76
	Vested			—				—
Cancelled/forfeited			(342	)			11.97
Nonvested at end of period			1,452			$	11.55

INCOME_TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
INCOME TAXES	NOTE 9—INCOME TAXES
	The provision for income taxes consisted of:
			Year Ended December 31,
			2014			2013				2012
			(In thousands)
	Other than U.S.:
	Current		$	21,619		$	54,410			$	125,402
	Deferred			(1,546	)		(5,359	)			3,802
	Total provision for income taxes		$	20,073		$	49,051			$	129,204
	The geographic sources of income before income taxes are as follows:
			Year Ended December 31,
			2014			2013				2012
			(In thousands)
	U.S.			(31,124	)	$	(151,904	)		$	(92,025	)
	Other than U.S.			(14,197	)		(288,955	)			422,967
	Income before provision for income taxes		$	(45,321	)	$	(440,859	)(1)		$	330,942	-1
	-1	These amounts have been restated to reflect the effect of a pension accounting change, as discussed in Note 1.
	The following is a reconciliation of the Panama statutory federal tax rate to the consolidated effective tax rate:
			Year Ended December 31,
			2014			2013				2012
	Panama federal statutory rate			25	%		25	%			25	%
	Non-Panama operations			3.5	%		-16.4	%			-4.4	%
	Valuation allowance for deferred tax assets			-86.6	%		-19.1	%			14.7	%
	Audit settlements and reserves			14.2	%		-0.9	%			3	%
	Other			-0.4	%		0.3	%			0.7	%
	Effective tax rate attributable to continuing operations			-44.3	%		-11.1	%	-1		39	-1%
	-1	Rate has been updated to reflect the effect of a pension accounting change, as discussed in Note 1. There has been no change in overall provision for income taxes.
	Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for tax purposes, as well as operating loss and tax credit carryforwards.
	Significant components of deferred tax assets and liabilities were as follows:
			December 31,
			2014			2013
	Deferred tax assets:
	Pension liability		$	10,976		$	16,658
	Accrued liabilities for incentive compensation			19,015			15,032
	Net operating loss carryforward			294,722			259,600
	State net operating loss carryforward			21,296			24,679
	Long-term contracts			39,817			13,504
	Other			1,549			4,936
	Total deferred tax assets			387,375			334,409
	Valuation allowance for deferred tax assets			(331,589	)		(292,388	)
	Deferred tax assets		$	55,786		$	42,021
	Deferred tax liabilities:
	Property, plant and equipment			28,815			19,115
	Prepaid drydock			10,280			13,025
	Investments in joint ventures and affiliated companies			13,583			8,354
	Unrealized exchange gains and other			3,162			3,236
	Total deferred tax liabilities		$	55,840		$	43,730
	Net deferred tax liability		$	54		$	1,709
			December 31,
			2014			2013
	Deferred tax assets and liabilities in the accompanying consolidated balance sheets include:
	Current deferred tax assets		$	7,514		$	7,091
	Noncurrent deferred tax assets			17,313			16,766
	Total		$	24,827		$	23,857
	Current deferred tax liabilities		$	19,753		$	17,892
	Noncurrent deferred tax liabilities			5,128			7,674
	Total		$	24,881		$	25,566
	Net deferred tax liability		$	54		$	1,709
	As of December 31, 2014, we had a valuation allowance of $331.6  million for deferred tax assets that we expect cannot be realized through carrybacks, future reversals of existing taxable temporary differences or based on our estimate of future taxable income. We believe that our remaining deferred tax assets will more likely than not be realized through carrybacks, future reversals of existing taxable temporary differences and future taxable income. Any changes to our estimated valuation allowance could be material to our consolidated financial statements.
	We have foreign net operating loss carryforwards of $538.3 million available to offset future taxable income in foreign jurisdictions. Of the foreign net operating loss carryforwards, $9.0 million is scheduled to expire in years 2015 to 2017. The foreign net operating losses have a valuation allowance of $127.0 million against the related deferred taxes. We have U.S. federal net operating loss carryforwards of approximately $459.7 million, which includes $16.2 million for which the benefit will be recorded in APIC when realized, and carry a $160.9 million valuation allowance against the related deferred taxes. The U.S. federal net operating loss carryforwards are scheduled to expire in years 2023 to 2034. We have state net operating losses of $409.5 million available to offset future taxable income in states where we operate. The state net operating loss carryforwards are scheduled to expire in years 2015 to 2028. We are carrying a valuation allowance of $21.3 million against the deferred tax asset related to the state loss carryforwards. We also have an approximate $28.1 million valuation allowance against other deferred tax assets.
	We have provided $13.0 million of taxes on earnings we intend to remit. All other earnings are considered permanently reinvested. We would be subject to withholding taxes if we were to distribute these permanently reinvested earnings from our U.S. subsidiaries and certain foreign subsidiaries. At December 31, 2014, the undistributed earnings of these subsidiaries were $136.8 million. Unrecognized deferred income tax liabilities, including withholding taxes, of approximately $0.3 million would be payable upon distribution of these earnings.
	We conduct business globally and, as a result, we or one or more of our subsidiaries file income tax returns in a number of jurisdictions. In the normal course of business, we are subject to examination by taxing authorities throughout the world, including such major jurisdictions as Australia, Indonesia, Singapore, Saudi Arabia, Kuwait, India, Azerbaijan and the United States. With few exceptions, we are no longer subject to tax examinations for years prior to 2009.
	A reconciliation of unrecognized tax benefits is as follows (in thousands):
			Year Ended December 31,
		2014			2013				2012
Balance at beginning of period		$	40,613		$	40,516			$	31,664
Increases based on tax positions taken in the current year			3,479			539				10,830
Increases based on tax positions taken in prior years			3,195			3,831				158
Decreases based on tax positions taken in prior years			(863	)		(3,688	)			(1,465	)
Decreases due to lapse of applicable statute of limitation			(12,318	)		(585	)			(671	)
Balance at end of period		$	34,106		$	40,613			$	40,516
The entire balance of unrecognized tax benefits at December 31, 2014 would reduce our effective tax rate if recognized.
We recognize accrued interest and penalties related to unrecognized tax benefits in income tax expense. During the year ended December 31, 2014, we had recorded liabilities of approximately $15.1 million for the payment of tax-related interest and penalties. At December 31, 2013 and 2012, we had recorded liabilities of approximately $15.4 million and $15.3 million, respectively, for the payment of tax-related interest and penalties.

EARNINGS_PER_SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
EARNINGS PER SHARE	NOTE 10—EARNINGS PER SHARE
	Basic earnings per share is computed by dividing net income attributable to McDermott International, Inc. by the weighted average number of common shares outstanding during the period. Diluted earnings per share equals net income attributable to McDermott International, Inc. divided by the weighted average common shares outstanding adjusted for the dilutive effect of our stock–based awards.
	The diluted earnings per share calculation excludes 3.1 million, 3.2 million and 1.8 million shares underlying outstanding stock-based awards for the years ended December 31, 2014, 2013 and 2012, respectively, as they were antidilutive.
	Potential dilutive common shares for the settlement of our common stock purchase contracts totaling 30.7 million shares were considered in the calculation of diluted weighted-average shares for year ended December 31, 2014; however, due to our net loss position, those shares have not been reflected below because they would be anti-dilutive.
	The following table sets forth the computation of basic and diluted earnings per share:
		Year Ended December 31,
		2014			2013			2012
		(In thousands, except share and per share amounts)
	Income (loss) from continuing operations less noncontrolling interest	$	(75,994	)	$	(508,868	)	$	190,968
	Income from discontinued operations, net of tax		—			—			3,497
	Net income (loss) attributable to McDermott International, Inc.	$	(75,994	)	$	(508,868	)	$	194,465
	Weighted average common shares (basic)		237,229,086			236,514,584			235,638,422
	Effect of dilutive securities:
	Stock options, restricted stock and restricted stock units		—			—			1,981,266
	Adjusted weighted average common shares and assumed exercises of stock options and vesting of stock awards (diluted)		237,229,086			236,514,584			237,619,688
	Basic earnings (loss) per share
	Income (loss) from continuing operations less noncontrolling interest		(0.32	)		(2.15	)		0.81
	Income (loss) from discontinued operations, net of tax		—			—			0.01
	Net income (loss) attributable to McDermott International, Inc.		(0.32	)		(2.15	)		0.83
	Diluted earnings (loss) per share:
	Income (loss) from continuing operations less noncontrolling interest		(0.32	)		(2.15	)		0.8
	Income (loss) from discontinued operations, net of tax		—			—			0.01
	Net income (loss) attributable to McDermott International, Inc.		(0.32	)		(2.15	)		0.82

SEGMENT_REPORTING

SEGMENT REPORTING	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
SEGMENT REPORTING	NOTE 11—SEGMENT REPORTING
	In the first quarter of 2015, we completed changes to our organizational structure which resulted in realignment of our reporting segments. The North Sea and Africa operations were previously aggregated into the MEA operating segment. However, the responsibility for business decisions relating to the North Sea and Africa was moved to our Americas operating segment in the first quarter of 2015. As a result, the North Sea and Africa businesses are now reflected in our Americas segment, now referred to as AEA. All comparable periods presented have been revised to reflect this change. Accordingly, we now report financial results under three reporting segments consisting of (1) AEA, (2) MEA and (3) ASA. We also report certain corporate and other non-operating activities under the heading “Corporate and other,” which primarily reflects corporate personnel and activities, incentive compensation programs and other costs that are generally fully allocated to our reporting segments. However, corporate restructuring costs associated with our corporate reorganization are not allocated to our reporting segments.
	We account for intersegment sales at prices that we generally establish by reference to similar transactions with unaffiliated customers. Reporting segments are measured based on operating income, which is defined as revenues reduced by total costs and expenses and equity in loss of unconsolidated affiliates.
	1. Information about Operations:
			Year Ended December 31,
			2014			2013			2012
			(In thousands)
	Revenues:
	ASA		$	937,615		$	953,838		$	1,575,682
	MEA			795,666			1,167,804			1,591,881
	AEA			567,608			537,290			474,061
	Total revenues(1):		$	2,300,889		$	2,658,932		$	3,641,624
	Operating income (loss):
	ASA		$	55,412		$	(72,159	)	$	236,874
	MEA			11,421			(169,224	)		138,733
	AEA			(49,337	)		(215,362	)		(68,468	)
	Corporate			(8,942	)		—			—
	Total operating income (loss)		$	8,554		$	(456,745	)	$	307,139
	Capital expenditures:
	ASA		$	154,735		$	117,060		$	219,920
	MEA			99,974			127,498			29,736
	AEA			53,431			22,177			32,699
	Corporate and Other			13,047			17,227			3,955
	Total capital expenditures(2):		$	321,187		$	283,962		$	286,310
	Depreciation and amortization:
	ASA		$	19,020		$	18,693		$	23,797
	MEA			31,876			31,699			31,119
	AEA			34,494			26,788			24,589
	Corporate and Other			7,795			7,400			6,935
	Total depreciation and amortization:		$	93,185		$	84,580		$	86,440
	Drydock amortization
	ASA		$	6,255		$	8,917		$	9,487
	MEA			2,011			2,133			2,489
	AEA			11,453			7,417			13,569
	Total drydock amortization		$	19,719		$	18,467		$	25,545
	-1	Intercompany transactions were not significant for the years ended December 31, 2014, 2013 and 2012.
	-2	Total capital expenditures represent expenditures for which cash payments were made during the period. Capital expenditures for the year ended December 31, 2014 include $27.0 million of cash payments for accrued capital expenditures outstanding at December 31, 2013. Capital expenditures for the year ended December 31, 2013 exclude approximately $48.3 million in accrued capital expenditures. There were no accrued capital expenditures for the year ended December 31, 2012.
	2. Information about our most significant Customers
	Our customers, which significantly impacted our segments during the years ended December 31, 2014, 2013 and 2012, were as follows:
			% of
			Consolidated			Reportable
			Revenues			Segment
	Year Ended December 31, 2014:
	Saudi Aramco			27	%	MEA
	Inpex Operations Australia Pty Ltd.			25	%	ASA
	Year Ended December 31, 2013:
	Saudi Aramco			25	%	MEA
	Azerbaijan International Oil Company			13	%	MEA
	Year Ended December 31, 2012:
	Exxon Mobil Corporation			24	%	ASA
	Saudi Aramco			22	%	MEA
	BHP Billiton Petroleum Pty Ltd.			10	%	ASA
	3. Information about our Service Lines and Operations in Different Geographic Areas:
			Year Ended December 31,
			2014			2013			2012
			(In thousands)
	Service line revenues:
	Installation Operations		$	1,041,525		$	1,155,516		$	1,885,143
	Fabrication Operations			266,854			370,854			487,215
	Project Services and Engineering
	Operations			314,776			341,084			337,774
	Procurement Activities			677,734			791,478			931,492
			$	2,300,889		$	2,658,932		$	3,641,624
	Geographic revenues:
Saudi Arabia		$	616,659		$	720,879		$	1,057,930
Australia			614,164			481,123			1,485,503
Brazil			290,561			176,475			87,597
Indonesia			150,205			144,538			—
United States			148,606			126,986			119,785
Mexico			130,642			117,813			55,974
Azerbaijan			111,382			345,742			268,419
Malaysia			98,004			329,689			67,553
United Arab Emirates			57,249			19,528			156,395
Other countries			83,417			196,159			342,468
		$	2,300,889		$	2,658,932		$	3,641,624
4. Information about our Segment Assets and Property, Plant and Equipment by Country:
		Year Ended December 31,
		2014			2013			2012
		(In thousands)
Segment assets:
ASA		$	601,394		$	1,030,823		$	1,402,923
MEA			990,671			1,116,916			1,006,284
AEA			979,310			535,326			536,734
Corporate and Other			872,582			124,306			387,686
Total assets		$	3,443,957		$	2,807,371		$	3,333,627
Property, plant and equipment, net(1):
Brazil		$	458,199		$	192,101		$	52,955
United Arab Emirates			306,320			145,635			110,292
Mexico			245,226			96,830			61,390
Singapore			219,570			306,948			324,106
Indonesia			189,064			154,630			144,322
Spain			154,078			94,917			15,159
United States			46,537			54,647			201,815
Saudi Arabia			20,561			191,400			102,334
Australia			—			14			212,955
Malaysia			—			240,042			—
Other countries			3,541			1,513			56,463
Total property, plant and equipment, net		$	1,643,096		$	1,478,677		$	1,281,791
-1	Our marine vessels are included in the country in which they were located as of year-end.
5. Information about our Unconsolidated Affiliates:
		Year Ended December 31,
		2014			2013			2012
		(In thousands)
Equity in loss of unconsolidated affiliates:
ASA		$	(10,009	)	$	(10,738	)	$	(10,123	)
AEA			4,829			(4,275	)		(6,016	)
MEA			(2,668	)		(1,103	)		(580	)
		$	(7,848	)	$	(16,116	)	$	(16,719	)
Investments in unconsolidated affiliates:
ASA		$	35,722		$	49,423
AEA			1,598			120
Corporate			866			993
Total investments in unconsolidated affiliates		$	38,186		$	50,536
Our consolidated balance sheets include accounts receivable attributable to our unconsolidated affiliates of approximately $20.1 million and $36.2 million as of December 31, 2014 and 2013, respectively.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	NOTE 12—COMMITMENTS AND CONTINGENCIES
	Investigations and Litigation
	On or about August 23, 2004, a declaratory judgment action entitled Certain Underwriters at Lloyd’s London, et al. v. J. Ray McDermott, Inc. et al., was filed by certain underwriters at Lloyd’s, London and Threadneedle Insurance Company Limited (the “London Insurers”), in the 23rd Judicial District Court, Assumption Parish, Louisiana, against MII, J. Ray McDermott, Inc. (“JRMI”) and two insurer defendants, Travelers and INA, seeking a declaration that the London Insurers have no obligation to indemnify MII and JRMI for certain bodily injury claims, including claims for asbestos and welding rod fume personal injury which have been filed by claimants in various state courts. Additionally, Travelers filed a cross-claim requesting a declaration of non-coverage in approximately 20 underlying matters. This proceeding was stayed by the Court on January 3, 2005. We do not believe an adverse judgment or material losses in this matter are probable, and, accordingly, we have not accrued any amounts relating to this contingency. Although there is a possibility of an adverse judgment, the amount or potential range of loss is not estimable at this time. The insurer-plaintiffs in this matter commenced this proceeding in a purported attempt to obtain a determination of insurance coverage obligations for occupational exposure and/or environmental matters for which we have given notice that we could potentially seek coverage. Because estimating losses would require, for every matter, known and unknown, on a case by case basis, anticipating what impact on coverage a judgment would have and a determination of an otherwise expected insured value, damages cannot be reasonably estimated.
	On December 16, 2005, a proceeding entitled Antoine, et al. vs. J. Ray McDermott, Inc., et al. (“Antoine Suit”), was filed in the 24th Judicial District Court, Jefferson Parish, Louisiana, by approximately 88 plaintiffs against approximately 215 defendants, including our subsidiaries formerly known as JRMI and Delta Hudson Engineering Corporation (“DHEC”), generally alleging injuries for exposure to asbestos, and unspecified chemicals, metals and noise while the plaintiffs were allegedly employed as Jones Act seamen. This case was dismissed by the Court on January 10, 2007, without prejudice to plaintiffs’ rights to refile their claims. On January 29, 2007, 21 plaintiffs from the dismissed Antoine Suit filed a matter entitled Boudreaux, et al. v. McDermott, Inc., et al. (the “Boudreaux Suit”), in the United States District Court for the Southern District of Texas, against JRMI and our subsidiary formerly known as McDermott Incorporated, and approximately 30 other employer defendants, alleging Jones Act seaman status and generally alleging exposure to welding fumes, solvents, dyes, industrial paints and noise. The Boudreaux Suit was transferred to the United States District Court for the Eastern District of Louisiana on May 2, 2007, which entered an order in September 2007 staying the matter until further order of the Court due to the bankruptcy filing of one of the co-defendants. On June 18, 2014, the Boudreaux Suit was voluntarily dismissed without prejudice. On January 29, 2007, another 43 plaintiffs from the dismissed Antoine Suit filed a matter entitled Antoine, et al. v. McDermott, Inc., et al. (the “New Antoine Suit”), in the 164th Judicial District Court for Harris County, Texas, against JRMI, our subsidiary formerly known as McDermott Incorporated and approximately 65 other employer defendants and 42 maritime products defendants, alleging Jones Act seaman status and generally alleging personal injuries for exposure to asbestos and noise. On April 27, 2007, the District Court entered an order staying all activity and deadlines in the New Antoine Suit, other than service of process and answer/appearance dates, until further order of the Court. The New Antoine Suit plaintiffs filed a motion to lift the stay on February 20, 2009, which is pending before the Texas District Court. On April 4, 2014, 20 of the plaintiffs in the New Antoine Suit voluntarily dismissed their claims without prejudice. The remaining plaintiffs seek monetary damages in an unspecified amount and attorneys’ fees. We cannot reasonably estimate the extent of a potential judgment against us, if any, and we intend to vigorously defend this suit.
	On August 15, 2013 and August 20, 2013, two separate alleged purchasers of our common stock filed purported class action complaints against us, Stephen M. Johnson and Perry L. Elders in the United States District Court for the Southern District of Texas. Both of the complaints sought to represent a class of purchasers of our stock between November 6, 2012 and August 5, 2013, and alleged, among other things, that the defendants violated federal securities laws by disseminating materially false and misleading information and failing to disclose material information relating to weaknesses in project bidding and execution, poor risk evaluation, poor project management and losses in each of our reporting segments. Each complaint sought relief, including unspecified compensatory damages and an award for attorneys’ fees and other costs. By order dated December 5, 2013, the District Court consolidated the two cases and appointed a lead plaintiff and lead plaintiff’s counsel. The lead plaintiff filed a consolidated amended complaint on February 6, 2014. The consolidated amended complaint asserts substantially the same claims as were made in the two original complaints, with some additional factual allegations, and purports to extend the class period to August 6, 2013. It also seeks relief, including unspecified compensatory damages and an award for attorneys’ fees and other costs. On April 7, 2014, MII and the other defendants filed a motion to dismiss the case. On May 22, 2014, the lead plaintiff filed an opposition to the motion to dismiss, and MII and the other defendants filed a reply in support of the defendants’ motion to dismiss on June 23, 2014. The motion to dismiss is still pending before the District Court. We believe the substantive allegations contained in the consolidated amended complaint are without merit, and we intend to defend against these claims vigorously.
	Additionally, due to the nature of our business, we and our affiliates are, from time to time, involved in litigation or subject to disputes or claims related to our business activities, including, among other things:
	·	performance—or warranty-related matters under our customer and supplier contracts and other business arrangements; and
	·	workers’ compensation claims, Jones Act claims, occupational hazard claims, including asbestos-exposure claims, premises liability claims and other claims.
	Based upon our prior experience, we do not expect that any of these other litigation proceedings, disputes and claims will have a material adverse effect on our consolidated financial condition, results of operations or cash flows; however, because of the inherent uncertainty of litigation and, in some cases, the availability and amount of potentially applicable insurance, we can provide no assurance that the resolution of any particular claim or proceeding to which we are a party will not have a material effect on our consolidated financial condition, results of operations or cash flows for the fiscal period in which that resolution occurs.
	Environmental Matters
	We have been identified as a potentially responsible party at various cleanup sites under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended (“CERCLA”). CERCLA and other environmental laws can impose liability for the entire cost of cleanup on any of the potentially responsible parties, regardless of fault or the lawfulness of the original conduct. Generally, however, where there are multiple responsible parties, a final allocation of costs is made based on the amount and type of wastes disposed of by each party and the number of financially viable parties, although this may not be the case with respect to any particular site. We have not been determined to be a major contributor of wastes to any of these sites. On the basis of our relative contribution of waste to each site, we expect our share of the ultimate liability for the various sites will not have a material adverse effect on our consolidated financial condition, results of operations or cash flows in any given year.
	As of December 31, 2014, we had total environmental reserves of $3.7 million, all which was included in current liabilities. At December 31, 2013, we had total environmental reserves of $6.3 million. Our environmental reserves are primarily reserves related to our Morgan City facility, which we established in connection with our plan to discontinue the utilization of this facility. Inherent in our estimates of environmental reserves are our expectations regarding the levels of contamination and remediation costs, which may vary significantly as remediation activities progress. Accordingly, changes in estimates could result in material adjustments to our operating results, and the ultimate loss may differ materially from the amounts we have provided for in our consolidated financial statements.
	Contracts Containing Liquidated Damages Provisions
	Some of our contracts contain provisions that require us to pay liquidated damages if we are responsible for the failure to meet specified contractual milestone dates and the applicable customer asserts a claim under those provisions. Those contracts define the conditions under which our customers may make claims against us for liquidated damages. In many cases in which we have historically had potential exposure for liquidated damages, such damages ultimately were not asserted by our customers. As of December 31, 2014, it is possible that we may incur liabilities for liquidated damages aggregating approximately $118.5 million, of which approximately $28.0 million has been recorded in our financial statements, based on our actual or projected failure to meet certain specified contractual milestone dates. The dates for which these potential liquidated damages could arise extend to July 2015. We believe we will be successful in obtaining schedule extensions or other customer-agreed changes that should resolve the potential for additional liquidated damages. Accordingly, we believe that no amounts for these potential liquidated damages in excess of the amounts currently reflected in our financial statements are probable of being paid by us. However, we may not achieve relief on some or all of the issues involved and, as a result, could be subject to higher damage amounts.
	Contractual Obligations
	At December 31, 2014, we had outstanding obligations related to our vessel construction contracts on the CSV 108 and DLV 2000 of approximately $253.8 million, all of which is due in 2015.
	Operating Leases
	Future minimum payments required under operating leases that have initial or remaining noncancellable lease terms in excess of one year at December 31, 2014 are as follows (in thousands):
	Fiscal Year Ending December 31,		Amount
	2015		$	25,051
	2016		$	18,531
	2017		$	15,155
	2018		$	11,457
	2019		$	12,288
	Thereafter		$	127,373
	Total rental expense for the years ended December 31, 2014, 2013 and 2012 was $106.5 million, $116.6 million and $60.7 million, respectively. These expense amounts include contingent rentals and are net of sublease income, neither of which is material.

QUARTERLY_FINANCIAL_DATA_UNAUD

QUARTERLY FINANCIAL DATA (UNAUDITED)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
QUARTERLY FINANCIAL DATA (UNAUDITED)	NOTE 13—QUARTERLY FINANCIAL DATA (UNAUDITED)
	The following tables set forth selected unaudited quarterly financial information for the years ended December 31, 2014 and 2013:
			Quarter Ended
			March 31,					June 30,					September 30,					December 31,
			2014					2014					2014					2014
			(In thousands, except per share data amounts)
	Revenues		$	603,811				$	476,083				$	414,595				$	806,400
	Operating income (loss)			(38,209	)				31,525					(10,711	)				25,949
	Net income (loss)			(45,984	)				(5,698	)				(25,946	)				12,234
	Net income attributable to non-controlling interest			536					1,699					4,306					4,059
	Net income (loss) attributable to McDermott International, Inc.			(46,520	)				(7,397	)				(30,252	)				8,175
			Per Share Data
			Quarter Ended
			March 31,					June 30,					September 30,					December 31,
			2014					2014					2014					2014
	Basic loss per common share:
	Income (loss) from continuing operations less noncontrolling interest			(0.20	)				(0.03	)				(0.13	)				0.03
	Net loss attributable to McDermott International, Inc.			(0.20	)				(0.03	)				(0.13	)				0.03
	Diluted loss per common share:
	Income (loss) from continuing operations less noncontrolling interest			(0.20	)				(0.03	)				(0.13	)				0.03
	Net loss attributable to McDermott International, Inc.			(0.20	)				(0.03	)				(0.13	)				0.03
	-1	Operating income for the quarter ended March 31, 2014 was influenced by negative changes in estimates on projects, mainly in our MEA segment.
	-2	Operating income for the quarter ended June 30, 2014 was influenced by a gain on the sale of assets, mainly of our Harbor Island facility of approximately $25.1 million and some of Morgan City facility assets.
	-3	Operating income for the quarter ended December 31, 2014 was influenced by positive changes in estimates and recognition of approved change orders.
			Quarter Ended
			March 31,			June 30,				September 30,			December 31,
			2013			2013				2013			2013
			(In thousands, except per share data amounts)
	Revenues		$	807,488		$	647,250			$	686,856		$	517,338
	Operating income (loss)			56,688			(146,321	)			(49,216	)		(317,896	)
	Net income (loss)			27,973			(142,922	)			(55,609	)		(319,352	)
	Net income attributable to non-controlling interest			3,765			3,286				5,023			6,884
	Net income (loss) attributable to McDermott International, Inc.			24,208			(146,208	)			(60,632	)		(326,236	)
			Per Share Data
			Quarter Ended
			March 31,			June 30,				September 30,			December 31,
			2013			2013				2013			2013
	Basic loss per common share:
	Income (loss) from continuing operations less noncontrolling interest			0.1			(0.62	)			(0.26	)		(1.38	)
	Net loss attributable to McDermott International, Inc.			0.1			(0.62	)			(0.26	)		(1.38	)
	Diluted loss per common share:
	Income (loss) from continuing operations less noncontrolling interest			0.1			(0.62	)			(0.26	)		(1.38	)
	Net loss attributable to McDermott International, Inc.			0.1			(0.62	)			(0.26	)		(1.38	)
	-1	Operating income for the quarter ended June 30, 2013 was influenced by increased cost estimates on projects in our MEA and ASA segments, as well as restructuring charges.
	-2	Operating income for the quarter ended September 30, 2013 was influenced by increased project losses.
	-3	Operating income for the quarter ended December 31, 2013 was influenced by increased cost estimates, impairment losses of $84.3 million and restructuring charges.
	We have retrospectively applied the new accounting method for recognizing actuarial gains and losses relating to our pension and other post-retirement benefit plans, as described in Note 1. The impact of these adjustments on previously reported quarterly results is summarized below (in thousands, except per share amounts).
			Quarter ended March 31,							Quarter ended June 30,						Quarter ended September 30,						Quarter ended December 31,
	Increase (decrease) to		2014			2013				2014			2013			2014				2013		2014(1)		2013(1)
	Operating income (loss)		$	3,433		$	3,655			$	3,433		$	3,215		$	3,432			$	3,438	$	6,369	$	(2,263	)
	Net income (loss)		$	3,433		$	3,655			$	3,433		$	3,215		$	3,432			$	3,438	$	6,369	$	(2,263	)
	Basic loss per common share:
	Net loss attributable to McDermott International, Inc.			0.01			0.02				0.01			0.01			0.01				0.01		—		(0.01	)
	Diluted loss per common share:
	Net loss attributable to McDermott International, Inc.			0.01			0.02				0.01			0.01			0.01				0.01		—		(0.01	)
	-1	Impact of the adjustments on quarters ended December 31, 2014 and 2013 includes effect of the actuarial adjustment recognized at the end of the year.

EFFECT_OF_ACCOUNTING_CHANGE

EFFECT OF ACCOUNTING CHANGE	12 Months Ended
	Dec. 31, 2014
Accounting Changes And Error Corrections [Abstract]
EFFECT OF ACCOUNTING CHANGE	NOTE 14—EFFECT OF ACCOUNTING CHANGE
	We have retrospectively applied the new accounting method for recognizing actuarial gains and losses, as described in Note 1. We recorded a cumulative increase to accumulated deficit of $88.3 million as of January 1, 2012 related to this accounting method change. The impact of these adjustments on our consolidated results and financial position is as follows:
			2014									2013									2012
			New method			Historical Method			Net Effect of Change			As Adjusted			Previously Reported			Net Effect of Change			As Adjusted		Previously Reported			Net Effect of Change
			(In thousands, except per share data amounts)
	Consolidated Statements of Operations:
	Selling, general and administrative expenses		$	208,564		$	225,231		$	(16,667	)	$	193,126		$	201,171		$	(8,045	)	$	218,162	$	205,974		$	12,188
	Operating Income (Loss)		$	8,554		$	(8,113	)	$	16,667		$	(456,745	)	$	(464,790	)	$	8,045		$	307,139	$	319,327		$	(12,188	)
	Net Income (Loss)		$	(65,394	)	$	(82,061	)	$	16,667		$	(489,910	)	$	(497,955	)	$	8,045		$	205,235	$	217,423		$	(12,188	)
	Net Income (Loss) Attributable to McDermott International, Inc.		$	(75,994	)	$	(92,661	)	$	16,667		$	(508,868	)	$	(516,913	)	$	8,045		$	194,465	$	206,653		$	(12,188	)
	Earnings per common share:
	Basic:
	Net Income (Loss) Attributable to McDermott International, Inc.			(0.32	)		(0.39	)		0.07			(2.15	)		(2.19	)		0.04			0.83		0.88			(0.05	)
	Diluted:
	Net Income (Loss) Attributable to McDermott International, Inc.			(0.32	)		(0.39	)		0.07			(2.15	)		(2.19	)		0.04			0.82		0.87			(0.05	)
	Consolidated Statements of Comprehensive Income (Loss):
	Unrealized gain (loss) on benefit plan revaluation		$	—		$	2,937		$	(2,937	)	$	—		$	(9,542	)	$	9,542		$	—	$	(23,821	)	$	23,821
	Amortization of benefit plan		$	—		$	13,730		$	(13,730	)	$	—		$	17,587		$	(17,587	)	$	—	$	11,633		$	(11,633	)
	costs
	Consolidated Balance Sheets:
	Retained Earnings/ (Accumulated Deficit)		$	(239,572	)	$	(163,818	)	$	(75,754	)	$	(163,578	)	$	(71,157	)	$	(92,421	)
	Accumulated Other Comprehensive		$	(97,808	)	$	(173,562	)	$	75,754		$	(47,710	)	$	(140,131	)	$	92,421
	Income (Loss)
	Consolidated Statements of Cash Flows:
	Net Income (Loss)		$	(65,394	)	$	(82,061	)	$	16,667		$	(489,910	)	$	(497,955	)	$	8,045		$	205,235	$	217,423		$	(12,188	)
	Other non-cash items		$	(3,605	)	$	8,961		$	(12,566	)	$	(6,029	)	$	(3,463	)	$	(2,566	)	$	6,837	$	8,367		$	(1,530	)
	Other assets and liabilities(1)		$	11,653		$	15,754		$	(4,101	)	$	(46,301	)	$	(40,822	)	$	(5,479	)	$	55,303	$	39,535		$	15,768
	Pension liability and accrued postretirement and employee benefits		$	-1,861		$	-1,861		$	—		$	-30,828		$	-30,828		$	—		$	34,847	$	36,897		$	(2,050	)
	-1	Other assets and liabilities for the years ended December 31, 2013 and 2012 have been adjusted to conform with the current year presentation for the non-cash impacts of gain of foreign exchange, as described in Note 1.

BASIS_OF_PRESENTATION_AND_SIGN1

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations
	McDermott International, Inc. (“MII”), a corporation incorporated under the laws of the Republic of Panama in 1959, is a engineering, procurement, construction and installation (“EPCI”) company focused on designing and executing complex offshore oil and gas projects worldwide. Providing fully integrated EPCI services, we deliver fixed and floating production facilities, pipeline installations and subsea systems from concept to commissioning. Operating in approximately 20 countries across the Americas, Middle East, Asia, the North Sea and Africa, our integrated resources include approximately 13,400 employees and a diversified fleet of marine vessels, fabrication facilities and engineering offices. We support our activities with comprehensive project management and procurement services, while utilizing our fully integrated capabilities in both shallow water and deepwater construction. Our customers include national, major integrated and other oil and gas companies, and we operate in most major offshore oil and gas producing regions throughout the world. We execute our contracts through a variety of methods, principally fixed-price, but also including cost reimbursable, cost-plus, day-rate and unit-rate basis or some combination of those methods. In these notes to our consolidated financial statements, unless the context otherwise indicates, “we,” “us” and “our” mean MII and its consolidated subsidiaries.
Basis of Presentation	Basis of Presentation
	We have presented our consolidated financial statements in U.S. Dollars in accordance with accounting principles generally accepted in the United States (“GAAP”). These consolidated financial statements include the accounts of McDermott International, Inc., its consolidated subsidiaries and controlled entities. We use the equity method to account for investments in entities that we do not control, but over which we have significant influence. We generally refer to these entities as “joint ventures” or “unconsolidated affiliates.” We have eliminated all intercompany transactions and accounts.
	We report financial results under three reporting segments consisting of Asia (“ASA”), Americas, Europe and Africa (“AEA”) and the Middle East (“MEA”). We also report certain corporate and other non-operating activities under the heading “Corporate and Other.” Corporate and Other primarily reflects corporate personnel and activities, incentive compensation programs and other costs, which are generally fully allocated to our operating segments. For financial information about our segments, see Note 11—“Segment Reporting”.
	Consolidated statements of cash flows for the years ended December 31, 2013 and 2012 include amounts of gain on foreign currency of $13.2 million and $23.1 million, respectively, that have been reclassified to conform to 2014 presentation. Certain 2013 amounts in consolidated balance sheet have been reclassified to conform to 2014 presentation.
Business Segments	Business Segments
	We continue to evolve our operating model to improve efficiency of decision-making so that we are able to better optimize market opportunities. In the first quarter of 2015, we completed changes to our organizational structure which resulted in realignment of our reporting segments. The North Sea and Africa operations were previously aggregated into the Middle East operating segment. However, the responsibility for business decisions relating to the North Sea and Africa was moved to our Americas operating segment in the first quarter of 2015. As a result, the North Sea and Africa business is reflected in our Americas segment, now referred to as Americas, Europe and Africa. All comparable periods presented have been revised to reflect this change. Accordingly, we now report financial results under three reporting segments consisting of (1) Americas, Europe and Africa (“AEA”), (2) the Middle East (“MEA”) and (3) Asia (“ASA”). We also report certain corporate and other non-operating activities under the heading “Corporate and other,” which primarily reflects corporate personnel and activities, incentive compensation programs and other costs that are generally fully allocated to our operating segments. However, corporate restructuring costs associated with our corporate reorganization are not allocated. See Note 11 for summarized financial information on our segments.
Pension Accounting Change	Pension Accounting Change
	In the fourth quarter of 2014, we elected to change our accounting method for recognizing actuarial gains and losses for our pension and other post-retirement benefit plans. Historically, these gains and losses were recognized as a component of accumulated other comprehensive income (loss) on our consolidated balance sheets and amortized into our consolidated statements of operations and comprehensive income (loss) over the average future service period or the average remaining life expectancy of the plan participants.   Under the new accounting method, we immediately recognize actuarial gains and losses into earnings in the fourth quarter each year as a component of net periodic benefit cost. We believe the new accounting method is preferable as it accelerates recognition of gains and losses into net income to be closer to when events resulting in gains and losses occur, such as plan investment performance, changes in discount rates, interest rate movements, mortality expectations and changes in other actuarial assumptions. This change has been reported through retrospective application of the new accounting method to all periods presented. See Note 4 for a further discussion of our pension and postretirement benefits and Notes 13 and 14 for disclosures relating to the effect of this change in our accounting method. Also see “— Accumulated Other Comprehensive Loss” and Note 9 for certain tax restated disclosures relating to pension accounting change.
Revenue Recognition	Revenue Recognition
	We determine the appropriate accounting method for each of our long-term contracts before work on the project begins. We generally recognize contract revenues and related costs on a percentage-of-completion method for individual contracts or combinations of contracts based on work performed, man hours, or a cost-to-cost method, as applicable to the activity involved. We include the amount of accumulated contract costs and estimated earnings that exceed billings to customers in contracts in progress. We include billings to customers that exceed accumulated contract costs and estimated earnings in advance billings on contracts. Most long-term contracts contain provisions for progress payments. We expect to invoice customers for all unbilled revenues. Certain costs are generally excluded from the cost-to-cost method of measuring progress, such as significant costs for materials and third-party subcontractors. Costs incurred prior to a project award are generally expensed during the period in which they are incurred. Total estimated project costs, and resulting contract income, are affected by changes in the expected cost of materials and labor, productivity, vessel costs, scheduling and other factors. Additionally, external factors such as weather, customer requirements and other factors outside of our control may affect the progress and estimated cost of a project’s completion and, therefore, the timing and amount of revenue and income recognition. In addition, change orders, which are a normal and recurring part of our business, can increase (sometimes substantially) the future scope and cost of a job. Therefore, change order awards (although frequently beneficial in the long term) can have the short-term effect of reducing the job percentage of completion and thus the revenues and profits recognized to date. We regularly review contract price and cost estimates as the work progresses and reflect adjustments in profit, proportionate to the job percentage of completion in the period when those estimates are revised. Revenue from unapproved change orders is generally recognized to the extent of the lesser of amounts we expect to recover or costs incurred. Additionally, to the extent that claims included in backlog, including those which arise from change orders which are under dispute or which have been previously rejected by the customer, are not resolved in our favor, there could be reductions in, or reversals of previously reported amounts of, revenues and profits, and charges against current earnings, which could be material.
	Claims Revenue
	Claims revenue may relate to various factors, including the procurement of materials, equipment performance failures, change order disputes or schedule disruptions and other delays, including those associated with weather or sea conditions. Claims revenue, when recorded, is only recorded to the extent of the lesser of the amounts management expects to recover or the associated costs incurred in our consolidated financial statements. We include certain unapproved claims in the applicable contract values when we have a legal basis to do so, consider collection to be probable and believe we can reliably estimate the ultimate value. Amounts attributable to unapproved change orders are not included in claims. We continue to actively engage in negotiations with our customers on our outstanding claims. However, these claims may be resolved at amounts that differ from our current estimates, which could result in increases or decreases in future estimated contract profits or losses. Claims are generally negotiated over the course of the respective projects and many of our projects are long-term in nature. None of the claims included in our estimates at completion at December 31, 2014 were the subject of any litigation proceedings.
	The amount of revenues and costs included in our estimates at completion (i.e., contract values) associated with such claims was $6.5 million and $17.2 million as of December 31, 2014 and December 31, 2013, respectively. All of those claim amounts at December 31, 2014 and 2013 were related to our MEA segment. These amounts are determined based on various factors, including our analysis of the underlying contractual language and our experience in making and resolving claims. There were no costs in the year ended December 31, 2014 in our consolidated financial statements pertaining to claims.  For the year ended December 31, 2013, $11.7 million of revenues and costs are included in our consolidated financial statements pertaining to claims, all of which were related to the MEA segment. Our unconsolidated joint ventures did not include any claims revenue or associated costs in their financial results for the year ended December 31, 2014 and 2013.
	We continue to actively engage in negotiations with our applicable customers with respect to our outstanding claims. However, these claims may be resolved at amounts that differ from our current estimates, which could result in increases or decreases in future estimated contract profits or losses.
	Deferred Profit Recognition
	For contracts as to which we are unable to estimate the final profitability due to their uncommon nature, including first-of-a-kind projects, we recognize equal amounts of revenue and cost until the final results can be estimated more precisely. For these contracts, we only recognize gross margin when reliably estimable and the level of uncertainty has been significantly reduced, which we generally determine to be when the contract is at least 70% complete. We treat long-term construction contracts that contain such a level of risk and uncertainty that estimation of the final outcome is impractical, as deferred profit recognition contracts If, while being accounted for under our deferred profit recognition policy, a current estimate of total contract costs indicates a loss, the projected loss is recognized in full and the project is accounted for under our normal revenue recognition guidelines. Prior to the fourth quarter of 2013, we accounted for an AEA segment project under our deferred profit recognition policy. The project was completed during the year ended December 31, 2014. Currently, we are not accounting for any projects under our deferred profit recognition policy.
	Completed Contract Method
	Under the completed contract method, revenue and gross profit is recognized only when a contract is completed or substantially complete. We generally do not enter into fixed-price contracts without an estimate of cost to complete that we believe to be accurate. However, it is possible that in the time between contract award and the commencement of work on a project, we could lose the ability to forecast costs to complete adequately, based on intervening events, including, but not limited to, experience on similar projects, civil unrest, strikes and volatility in our expected costs. In such a situation, we would use the completed contract method of accounting for that project. We did not enter into any contracts that we accounted for under the completed contract method during 2014, 2013 or 2012.
	Loss Recognition
	A risk associated with fixed-priced contracts is that revenue from customers may not cover increases in our costs. It is possible that current estimates could materially change for various reasons, including, but not limited to, fluctuations in forecasted labor and vessel productivity, vessel repair requirements, weather downtime, subcontractor or supplier performance, pipeline lay rates or steel and other raw material prices. Increases in costs associated with our fixed-price contracts could have a material adverse impact on our consolidated financial condition, results of operations and cash flows. Alternatively, reductions in overall contract costs at completion could materially improve our consolidated financial condition, results of operations and cash flows.
	As of December 31, 2014, we have provided for our estimated costs to complete on all of our ongoing contracts. However, it is possible that current estimates could change due to unforeseen events, which could result in adjustments to overall contract costs. Variations from estimated contract performance could result in material adjustments to operating results. For all contracts, if a current estimate of total contract cost indicates a loss, the projected loss is recognized in full when determined.
	Of the December 31, 2014 backlog, approximately $401.2 million relates to five active projects that are in a loss position, whereby future revenues are expected to equal costs when recognized. Included in this amount are $146.4 million of backlog associated with an EPCI project in Altamira which is expected to be completed in the fourth quarter of 2015, $102.2 million of backlog pertaining to a five-year charter of the Agile in Brazil, which began in early 2012, and $50.1 million of backlog relating to a charter project in Brazil scheduled for completion during the second quarter of 2015, all of which are being conducted by our AEA segment. The amount also includes $92.9 million of backlog relating to an EPCI project in Saudi Arabia which is expected to be completed by the third quarter of 2016 and $9.6 million of backlog relating to a hook-up project in Saudi Arabia scheduled for completion by the second quarter of 2015, both being conducted in our MEA segment. It is possible that our estimates of gross profit could increase or decrease based on changes in productivity, actual downtime and the resolution of change orders and claims with the customers.
Use of Estimates	Use of Estimates
	We use estimates and assumptions to prepare our financial statements in conformity with GAAP. These estimates and assumptions affect the amounts we report in our financial statements and accompanying notes. Our actual results could differ from these estimates, and variances could materially affect our financial condition and results of operations in future periods. Changes in project estimates generally exclude change orders and changes in scope, but may include, without limitation, changes in cost recovery estimates, unexpected changes in weather conditions, productivity, unidentified required vessel repairs, customer and vendor delays and other costs. We generally expect to experience a reasonable amount of unanticipated events, and some of these events can result in significant cost increases above cost amounts we previously estimated. As of December 31, 2014, we have provided for our estimated costs to complete on all of our ongoing contracts. However, it is possible that current estimates could change due to unforeseen events, which could result in adjustments to overall contract costs. Variations from estimated contract performance could result in material adjustments to operating results. For all contracts, if a current estimate of total contract cost indicates a loss, the projected loss is recognized in full when determined.
	The following is a discussion of our most significant changes in estimates, which impacted operating income for the years ended December 31, 2014, 2013 and 2012.
	Year ended December 31, 2014
	Operating income for the year ended December 31, 2014 was impacted by changes in estimates relating to projects in each of our segments.
	The ASA segment experienced net favorable changes aggregating approximately $51.6 million, primarily attributable to changes in estimates on seven projects. Changes in estimates on a recently completed subsea project in Malaysia resulted in an improvement of approximately $34.3 million during the year ended December 31, 2014, primarily related to productivity improvements on our marine vessels and offshore support activities, as well as the favorable resolution of cost contingencies relating to offshore performance risks. On a recently completed marine installation project in Brunei, a reduction in estimated cost to complete from productivity improvements on marine vessels and offshore support activities resulted in a favorable change of approximately $11.8 million. On two previously completed projects, insurance claim collection and final project close-out adjustments resulted in a combined additional recovery of approximately $10.3 million during the year ended December 31, 2014. In addition, completion of two projects resulted in project close-out savings of approximately $6.3 million. These positive changes were partially offset by a negative change in estimate of $11.0 million on an EPCI project in Australia, primarily due to lower than expected fabrication productivity, increase in procurement costs as well as an increase in marine costs primarily due to changes in marine asset utilization.
	The MEA segment was negatively impacted by net unfavorable changes aggregating approximately $4.4 million, primarily attributable to changes in four projects. On one EPCI project in Saudi Arabia, we increased our estimated cost at completion by approximately $22.5 million (which may be recoverable from the customer, but which were not recognizable at December 31, 2014), primarily as a result of vessel downtime due to weather and standby delays amounting to $43.0 million, partially offset by increased cost recovery estimates of approximately $20.5 million based on positive discussions with the customer during the fourth quarter of 2014. On another EPCI project in Saudi Arabia, we increased our estimated cost to complete by $19.2 million, primarily as a result of increased cost estimates to complete the onshore scope. Although the project recognized a loss in the year ended December 31, 2013, it remains in an overall profitable position and is expected to be fully closed out by the quarter ending June 2015. On a third EPCI project in Saudi Arabia, we increased our estimated costs to complete by approximately $12.2 million, to reflect cost overruns related to (1) the onshore work, which was substantially completed in July 2014, and (2) delays in completing the offshore work, due to delayed access to the project site, resulting in a revised execution plan. The revised execution plan included the costs of an incremental mobilization and reflected inefficiencies of executing out-of-sequence work. This project remains profitable and is expected to be completed by March 2015. These negative changes were partially offset by approximately $53.5 million of increased cost recovery estimates on a recently completed pipelay project in the Caspian based on positive negotiations with the customer during the year ended December 31, 2014 in connection with the ongoing project close-out process. We expect final settlement on this process during early 2015, which could result in further changes to be recognized in 2015.
	The AEA segment was negatively impacted by net unfavorable changes in estimates aggregating $37.2 million associated with five projects. On an EPCI project in Altamira, we increased our estimated cost to complete by approximately $68.9 million, due to liquidated damages and extended project management costs arising from unexpected project delays and projected fabrication cost increases reflecting reduced productivity and execution plan changes to mitigate further project delays, as well as procurement and marine installation cost increases. This project is in a loss position and is estimated to be completed in the fourth quarter of 2015. On a subsea project in the U. S.  Gulf of Mexico, we increased our estimated cost to complete by approximately $5.5 million, primarily due to increased costs from equipment downtime issues on the North Ocean 102 (the “NO 102”), our primary vessel working on the project, partially offset by project close-out savings on marine spread costs and increased cost recovery estimates based on positive developments from the ongoing negotiations with the customer. This project, which was in a loss position, was completed during the year ended December 31, 2014. On a fabrication project in Morgan City completed during 2013, we reduced our cost recovery estimates by approximately $7.8 million, mainly based on an agreement in principle with the customer during the year ended December 31, 2014, which resulted in lower-than-anticipated recoveries. These negative impacts were partially offset by $39.8 million of project close-out improvements on an EPCI project in Brazil, which resulted from marine cost reductions upon completion of activities and increased recoveries due to successful developments from the ongoing approval process for additional weather-related compensation. We also recognized $5.2 million of cost reductions on a marine installation project in the U. S. Gulf of Mexico, mainly due to project close-out improvements.
	Year ended December 31, 2013
	For the year ended December 31, 2013, we recognized net project losses of approximately $315.1 million due to changes in estimates across all three of our operating segments.
	The ASA segment was negatively impacted by net losses of approximately $62.2 million due to changes in estimates on four projects. On the subsea project in Malaysia discussed above, we increased our estimated cost at completion by approximately $126.9 million primarily due to downtime on the NO 105 resulting from mechanical and offshore productivity issues. This project was completed in June 2014 with subsequent improvements of approximately $34.3 million in 2014, as discussed above. On an EPCI project in Australia we completed a settlement with the customer which resulted in lower-than-expected recoveries. This project was completed in the first quarter of 2013 and the settlement documents were executed on February 5, 2014. These deteriorations were partially offset by improvements on two projects. On another EPCI project in Australia, we reduced estimated costs to complete the project by approximately $64.1 million as a result of efficiencies and productivity improvements related to offshore hookup activities. This project was completed in early 2013. On a fabrication project in Australia, we increased our change order recovery and bonuses recognized by approximately $14.7 million resulting from settlements and achieved milestones. This project was completed in March 2014.
	The MEA segment was negatively impacted by losses of $174.4 million due to changes in estimates on four projects. On the pipelay project in the Caspian Sea, we reduced the estimate of cost recovery as a result of ongoing negotiations with the customer.  This project was completed in June 2014 with subsequent improvements of approximately $53.5 million in 2014, as discussed above. On an EPCI project in Saudi Arabia, we increased our estimated cost at completion by approximately $62.5 million, primarily as a result of revisions to the project’s execution plans, increases in our estimated cost to complete due to an extended offshore hookup campaign requiring multiple vessel mobilizations and delays in completion of onshore activities. On another EPCI project in Saudi Arabia, we increased our estimated cost to complete by approximately $16.5 million, primarily due to weather downtime and revisions to our estimated cost to complete the hookup campaign. On a third EPCI project in Saudi Arabia, we increased our estimated cost to complete by approximately $16.4 million due to procurement and design issues which were settled on less favorable terms than previously expected. This project is currently in a loss position and is expected to be completed during the third quarter of 2016.
	The AEA segment was negatively impacted by changes in estimates on six projects resulting in approximately $78.5 million of project losses. In Morgan City, we incurred additional costs of approximately $9.3 million to complete a fabrication project, primarily due to poor labor productivity. That project was completed during the fourth quarter of 2013. On a marine project in Mexico completed during 2012, we reversed previously recognized claim revenue by approximately $10.0 million due to unsuccessful claim resolution efforts. On the five-year charter of the Agile in Brazil, we increased the estimated cost to complete the project by approximately $8.6 million. The completion of this charter is expected during the first quarter of 2017. On two EPCI projects in Altamira, we increased our estimated costs at completion by approximately $40.9 million, primarily due to higher procurement costs, reduced labor productivity, and reduced utilization of the fabrication facility. Both of these projects are in a loss position. One was completed during the year ended December 31, 2014 and the other is expected to be completed by the fourth quarter of 2015. On a subsea project in the U.S. Gulf of Mexico, we recognized a loss of approximately $9.7 million, primarily driven by the recognition of liquidated damages due to the anticipated late arrival of vessels currently engaged on projects in Brazil and Malaysia. This project was completed during the year ended December 31, 2014.
	Year ended December 31, 2012
	Operating income for the year ended December 31, 2012 in our ASA segment benefited significantly from certain changes in estimates, which resulted in a reduction of remaining costs as a result of efficiencies and productivity improvements related to offshore hook-up activities on one of our EPCI projects, which was completed in early 2013. Excluding those cost savings, our costs increased by approximately 8% for the year ended December 31, 2012. These benefits were partially offset by certain project charges of approximately $23.0 million associated with anticipated productivity changes and project delays on one of our subsea projects, which was completed in 2014. In addition, our AEA segment was impacted by project charges of approximately $16.0 million relating to two projects, which were completed in 2013 primarily due to lower than expected fabrication productivity. In our MEA segment, we experienced project charges of approximately $13.0 million associated with increased cost estimates resulting from fabrication productivity and, to a lesser extent, higher than expected marine costs on a project, which was completed in early 2013.
Loss Contingencies	Loss Contingencies
	We record liabilities for loss contingencies when it is probable that a liability has been incurred and the amount of loss is reasonably estimable. We provide disclosure when there is a reasonable possibility that the ultimate loss will exceed the recorded provision or if such loss is not reasonably estimable. We are currently involved in litigation and other proceedings, as discussed in Note 12. We have accrued our estimates of the probable losses associated with these matters and associated legal costs are generally recognized in selling, general and administrative expenses as incurred. However, our losses are typically resolved over long periods of time and are often difficult to estimate due to various factors, including the possibility of multiple actions by third parties. Therefore, it is possible future earnings could be affected by changes in our estimates related to these matters.
Cash and Cash Equivalents	Cash and Cash Equivalents
	Our cash and cash equivalents are highly liquid investments with maturities of three months or less when we purchase them. We record cash and cash equivalents as restricted when we are unable to freely use such cash and cash equivalents for our general operating purposes. A majority of our restricted cash and cash equivalents serves as collateral for outstanding letters of credit, as further discussed in Note 3.
Investments	Investments
	We classify investments available for current operations as current assets in the accompanying balance sheet, and we classify investments held for long-term purposes as noncurrent assets. We adjust the amortized cost of debt securities for amortization of premiums and accretion of discounts to maturity. That amortization is included in interest income. We include realized gains and losses on our investments in other income (expense)—net. The cost of securities sold is based on the specific identification method. We include interest earned on securities in interest income.
Investments in Unconsolidated Affiliates	Investments in Unconsolidated Affiliates
	We generally use the equity method of accounting for affiliates in which our investment ownership ranges from 20% to 50% and over which we exercise significant influence. Currently, all of our significant investments in affiliates that are not consolidated are recorded using the equity method.
Accounts Receivable	Accounts Receivable
	Accounts Receivable—Trade, Net
	A summary of contract receivables is as follows:
	We expect to invoice our unbilled receivables once certain milestones or other metrics are reached, and we expect to collect all unbilled amounts. We believe that our provision for losses on uncollectible accounts receivable is adequate for our credit loss exposure.
			31-Dec-14				31-Dec-13
			(in thousands)
	Contract receivables:
	Contracts in progress		$	106,174			$	192,745
	Completed contracts			34,698				77,248
	Retainages			28,586				127,698
	Unbilled			4,303				14,571
	Less allowances			(30,391	)			(30,404	)
	Accounts receivable—trade, net		$	143,370			$	381,858
	The following amounts represent retainages on contracts:
			31-Dec-14				31-Dec-13
			(in thousands)
	Retainages expected to be collected within one year		$	28,586			$	127,698
	Retainages expected to be collected after one year			137,468				65,365
	Total retainages		$	166,054			$	193,063
	We have included in accounts receivable—trade, net, retainages expected to be collected in 2015. Retainages expected to be collected after one year are included in other assets. Of the long-term retainages at December 31, 2014, we expect to collect $86.0 million in 2016 and $51.5 million in 2017.
	Accounts Receivable—Other
	A summary of accounts receivable—other is as follows:
		31-Dec-14				31-Dec-13
		(In thousands)
	Other taxes receivable	$	31,392			$	14,934
	Receivables from unconsolidated affiliates		20,061				36,181
	Accrued unbilled revenue		15,442				15,696
	Intercompany unbilled cost		3,978				5,373
	Employee receivables		4,336				4,532
	Foreign currency forward contracts		1,173				11,641
	Other		4,706				916
	Accounts receivable-other	$	81,088			$	89,273
	Employee receivables are expected to be collected within 12 months, and any allowance for doubtful accounts on our accounts receivable—other is based on our estimate of the amount of probable losses due to the inability to collect these amounts (based on historical collection experience and other available information). As of December 31, 2014 and December 31, 2013, no such allowance for doubtful accounts was recorded.
Contracts in Progress and Advance Billings on Contracts	Contracts in Progress and Advance Billings on Contracts
	Contracts in progress were $357.6 million and $426.0 million at December 31, 2014 and December 31, 2013, respectively. Advance billings on contracts were $199.9 million and $278.9 million at December 31, 2014 and December 31, 2013, respectively. A detail of the components of contracts in progress and advance billings on contracts is as follows:
			31-Dec-14				31-Dec-13
			(In thousands)
	Costs incurred less costs of revenue recognized		$	90,191			$	65,113
	Revenues recognized less billings to customers			267,426				360,873
	Contracts in Progress		$	357,617			$	425,986
	Billings to customers less revenue recognized		$	578,896			$	466,205
	Costs incurred less costs of revenue recognized			(379,031	)			(187,276	)
	Advance Billings on Contracts		$	199,865			$	278,929
Other Non-Current Assets	Other Non-Current Assets
	We have included debt issuance costs in other non-current assets. The current portion of debt-issuance costs has been included in other current assets. We amortize debt issuance costs as interest expense on a straight-line basis over the life of the related debt. The following summarizes the changes in the carrying amount of these assets:
		Year ended December 31, 2014				Year ended December 31, 2013
		(In thousands)
	Balance at beginning of period	$	14,951			$	13,761
	Debt issuance costs		47,737				4,905
	Former Credit Agreement debt issuance cost write off		(11,913	)			—
	Amortization of interest expense		(10,999	)			(3,715	)
			39,776				14,951
	Less: Current portion		(12,936	)			—
	Noncurrent portion	$	26,840			$	14,951
	Also included in other non-current assets are long-term deferred drydock expenses, long-term prepaid rent and other prepaid expenses.
Fair Value of Financial Instruments	Fair Value of Financial Instruments
	Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. An established hierarchy for inputs is used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs that market participants would use in valuing the asset or liability and are developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors that market participants would use in valuing the asset or liability.
	Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:
	·	Level 1—inputs are based on quoted prices for identical instruments traded in active markets.
	·	Level 2—inputs are based on quoted prices for similar instruments in active markets, quoted prices for similar or identical instruments in inactive markets and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets and liabilities.
	·	Level 3—inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models and similar valuation techniques.
	The carrying amounts that we have reported for financial instruments, including cash and cash equivalents, accounts receivables and accounts payable approximate their fair values. See Note 7 for additional information regarding fair value measurements.
Derivative Financial Instruments	Derivative Financial Instruments
	Our worldwide operations give rise to exposure to changes in certain market conditions, which may adversely impact our financial performance. When we deem it appropriate, we use derivatives as a risk management tool to mitigate the potential impacts of certain market risks. The primary market risk we manage through the use of derivative instruments is movement in foreign currency exchange rates. We use foreign currency derivative contracts to reduce the impact of changes in foreign currency exchange rates on our operating results. We use these instruments to hedge our exposure associated with revenues and/or costs on our long-term contracts and other cash flow exposures that are denominated in currencies other than our operating entities’ functional currencies. We do not hold or issue financial instruments for trading or other speculative purposes.
	In certain cases, contracts with our customers contain provisions under which some payments from our customers are denominated in U.S. Dollars and other payments are denominated in a foreign currency. In general, the payments denominated in a foreign currency are designed to compensate us for costs that we expect to incur in such foreign currency. In these cases, we may use derivative instruments to reduce the risks associated with foreign currency exchange rate fluctuations arising from differences in timing of our foreign currency cash inflows and outflows. We recognize all derivatives at fair value on the balance sheet. Derivatives that are not accounted for as hedges under ASC 815 - Derivatives and Hedging, are adjusted to fair value and such changes are reflected through the results of operations. If the derivative is designated as a hedge, depending on the nature of the hedge, changes in the fair value of derivatives are either offset against the change in fair value of the hedged assets, liabilities or firm commitments through earnings or recognized in other comprehensive income (loss) until the hedged item is recognized in earnings. See Note 5 for additional information regarding derivative financial instruments.
	The ineffective portion of a derivative’s change in fair value and any portion excluded from the assessment of effectiveness are immediately recognized in earnings. Gains and losses on derivative financial instruments that are immediately recognized in earnings are included as a component of gain (loss) on foreign currency-net in our consolidated statements of operations.
Concentration of Credit Risk	Concentration of Credit Risk
	Our principal customers are businesses in the offshore oil and gas industry. This concentration of customers may impact our overall exposure to credit risk, either positively or negatively, in that our customers may be similarly affected by changes in economic or other conditions. In addition, we and many of our customers operate worldwide and are therefore exposed to risks associated with the economic and political forces of various countries and geographic areas. We generally do not obtain any collateral for our receivables. See Note 11 for additional information about our operations in different geographic areas.
Foreign Currency Translation	Foreign Currency Translation
	We translate assets and liabilities of our foreign operations, other than operations in highly inflationary economies, into U.S. Dollars at year-end exchange rates, and we translate income statement items at average exchange rates for the periods presented. We record adjustments resulting from the translation of foreign currency financial statements as a component of other comprehensive income (loss), net of tax.
Capitalization of Interest Cost	Capitalization of Interest Cost
	We incurred interest of $85.4 million and capitalized, primarily on the vessels under construction, $23.9 million of interest in the year ended December 31, 2014. We incurred and capitalized $8.9 million and $8.6 million of interest in the years ended December 31, 2013 and 2012, respectively.
Earnings per Share	Earnings per Share
	We have computed earnings per common share on the basis of the weighted average number of common shares, and, where dilutive, common share equivalents, outstanding during the indicated periods. See Note 10 for our earnings per share computations.
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss
	Components of accumulated other comprehensive income (loss) (“AOCI”) have been restated to reflect the retrospective change in accounting method for recognizing actuarial gain and losses related to pension and postretirement benefit plans.
	The components of AOCI included in stockholders’ equity are as follows:
		31-Dec-14				31-Dec-13
		(In thousands)
	Foreign currency translation adjustments	$	(15,212	)		$	(2,562	)
	Net gain on investments		241				238
	Net loss on derivative financial instruments		(82,837	)			(45,386	)
	Accumulated other comprehensive loss	$	(97,808	)		$	(47,710	)
	The following tables present the components of AOCI and the amounts that were reclassified during the period:
			Foreign currency translation gain (loss)				Unrealized holding gain (loss) on investments			Deferred gain (loss) on derivatives(1)				TOTAL
			(in thousands)
	Balance, January 1, 2013		$	(3,366	)		$	(2,316	)	$	11,735			$	6,053
	Other comprehensive income (loss) before reclassification			804				920			(52,781	)			(51,057	)
	Amounts reclassified from AOCI		—					1,634			(4,340	)	-2		(2,706	)
	Net current period other comprehensive income (loss)			804				2,554			(57,121	)			(53,763	)
	Balance, December 31, 2013		$	(2,562	)		$	238		$	(45,386	)		$	(47,710	)
	Other comprehensive income (loss) before reclassification			(9,250	)			3			(65,503	)			(74,750	)
	Amounts reclassified from AOCI			(3,400	)		—				28,052		-2		24,652
	Net current period other comprehensive income (loss)			(12,650	)			3			(37,451	)			(50,098	)
	Balance, December 31, 2014		$	(15,212	)		$	241		$	(82,837	)		$	(97,808	)
	-1	Refer to Note 6 for additional details
	-2	Reclassified to cost of operations and gain on foreign currency, net
Stock-Based Compensation	Stock-Based Compensation
	Equity instruments are measured at fair value on the grant date. Stock-based compensation expense is generally recognized on a straight-line basis over the requisite service periods of the awards. We use a Black-Scholes model to determine the fair value of certain share-based awards, such as stock options. Additionally, we use a Monte Carlo model to determine the fair value of certain share-based awards that contain market and performance-based conditions. The use of these models requires highly subjective assumptions, such as assumptions about the expected life of the award, vesting probability, expected dividend yield and the volatility of our stock price.
Property, Plant and Equipment	Property, Plant and Equipment
	We carry our property, plant and equipment at depreciated cost. Except for major marine vessels, we depreciate our property, plant and equipment using the straight-line method, over estimated economic useful lives of eight to 33 years for buildings and three to 28 years for machinery and equipment. We do not depreciate property, plant and equipment classified as held for sale.
	We depreciate major marine vessels using the units-of-production method based on the utilization of each vessel. Our units-of-production method of depreciation involves the calculation of depreciation expense on each vessel based on the product of actual utilization for the vessel for the period and the applicable daily depreciation value (which is based on vessel book value, standard utilization and vessel life) for the vessel. Our actual utilization is determined based on the actual days that the vessel was working or otherwise actively engaged (other than in transit between regions) under a contract, as determined by daily vessel operating reports prepared by the crew of the vessel. Our standard utilization is determined by vessel at least annually based on recent actual utilization combined with an expectation of future utilization, both of which allow for idle time. We ensure that a minimum amount of accumulated depreciation of at least 50% of equivalent life-to-date straight-line depreciation is recorded. Additionally, in periods of very low utilization, a minimum amount of depreciation expense of at least 25% of an equivalent straight-line depreciation expense (which is based on an initial 25-year life) is recorded.
	Our depreciation expense was $93.2 million, $84.6 million and $86.4 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	A summary of property, plant and equipment by asset category is as follows:
			Year Ended December 31,
			2014				2013
			(In thousands)
	Marine Vessels		$	1,241,105			$	1,089,121
	Construction Equipment			496,557				576,855
	Construction in Progress			435,447				408,705
	Buildings			159,623				161,407
	All other			140,831				131,598
	Total Cost		$	2,473,563			$	2,367,686
	Accumulated Depreciation			(830,467	)			(889,009	)
	Net Book Value		$	1,643,096			$	1,478,677
	We capitalize drydocking costs in other assets when incurred and amortize the costs over the period of time between drydockings, which is generally three to five years. We expense the costs of other maintenance, repairs and renewals, which do not materially prolong the useful life of an asset, as we incur them.
Impairment Review	Impairment Review
	We review goodwill for impairment on an annual basis or more frequently if circumstances indicate that impairment may exist. The annual impairment review involves comparing the fair value to the net book value of each applicable reporting unit and, therefore, is significantly impacted by estimates and judgments.
	We recorded a goodwill impairment charge of approximately $46.7 million in the fourth quarter of 2013 in our consolidated statements of operations. This amount represented the total amount of our goodwill, which was primarily related to a 2007 acquisition.
	We review our tangible and intangible long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. If an evaluation is required, the fair value of each applicable asset is compared to its carrying value. Factors that impact our determination of potential impairment include forecasted utilization of equipment and estimates of forecasted cash flows from projects expected to be performed in future periods. Our estimates of cash flow may differ from actual cash flow due to, among other things, economic conditions or changes in operating performance. Any changes in such factors may negatively affect our business segments and result in future asset impairments. During the year ended December 31, 2014, we determined that certain of our intangible assets were fully impaired and recorded an impairment charge of approximately $1.7 million in the quarter ended December 31, 2014.
	In June 2014, we cancelled a pipelay system originally intended for the CSV 108, which resulted in a $10.7 million improvement to the cancellation cost estimate included in the $37.8 million of vessel-impairment charges recognized during the year ended December 31, 2013.
	Based on market conditions and expected future utilization of our entire marine fleet, we recognized impairment charges totaling approximately $37.8 million during the year ended December 31, 2013 in our consolidated statements of operations related to the cancellation of in-progress upgrades to one of our existing marine vessels and the deferral of a portion of the scope of work relating to one of our marine vessels under construction. We used appraised values and discounted future cash flows associated with the assets to determine the impairment amounts. Appraised values and discounted cash flows involve significant management judgments.
	We did not recognize any impairment for the year ended December 31, 2012.
Income Taxes	Income Taxes
	We provide for income taxes based on the tax laws and rates in the countries in which we conduct our operations. MII is a Panamanian corporation that earns all of its income outside of Panama. As a result, we are not subject to income tax in Panama. We operate in various taxing jurisdictions around the world. Each of these jurisdictions has a regime of taxation that varies, not only with respect to nominal rates, but also with respect to the basis on which these rates are applied. These variations, along with changes in our mix of income or loss from these jurisdictions, may contribute to shifts, sometimes significant, in our effective tax rate.
	We believe that our deferred tax assets recorded as of December 31, 2014 are realizable through carrybacks, future reversals of existing taxable temporary differences and future taxable income. We record a valuation allowance to reduce our deferred tax assets to the amount that is more likely than not to be realized. If we subsequently determine that we will be able to realize deferred tax assets in the future in excess of our net recorded amount, the resulting adjustment would increase earnings for the period in which such determination was made. We will continue to assess the adequacy of the valuation allowance on a quarterly basis. Any changes to our estimated valuation allowance could be material to our consolidated financial condition and results of operations. See Note 9 for additional disclosures relating to income taxes.
Insurance and Self-Insurance	Insurance and Self-Insurance
	Our wholly owned “captive” insurance subsidiary provides coverage for our retentions under employer’s liability, general and products liability, automobile liability and workers’ compensation insurance and, from time to time, builder’s risk and marine hull insurance within certain limits. We may also have business reasons in the future to arrange for our insurance subsidiary to insure other risks which we cannot or do not wish to transfer to outside insurance companies. Premiums charged and reserves related to these insurance programs are based on the facts and circumstances specific to the insurance claims, our past experience with similar claims, loss factors and the performance of the outside insurance market for the type of risk at issue. The actual outcome of insured claims could differ significantly from estimated amounts. We maintain actuarially determined accruals in our consolidated balance sheets to cover self-insurance retentions for the coverages discussed above. These accruals are based on various assumptions developed utilizing historical data to project future losses. Loss estimates in the calculation of these accruals are adjusted as required based upon actual claim settlements and reported claims. We reduced our self-insurance accruals, primarily due to fewer and less severe Workers’ Compensation claims, by $8.0 million, $7.2 million and $6.8 million during the years ended December 31, 2014, 2013 and 2012, respectively, and recognized these reductions in cost of operations in our consolidated statements of operations.
Recently Issued Accounting Standards	Recently Issued Accounting Standards
	In August 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2014-15, “Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern” (“ASU 2014-15”). Currently, there is no guidance in effect under U.S. GAAP regarding management’s responsibility to assess whether there is substantial doubt about an entity’s ability to continue as a going concern. Under ASU 2014-15, we will be required to assess our ability to continue as a going concern each interim and annual reporting period and provide certain disclosures if there is substantial doubt about our ability to continue as a going concern, including management’s plan to alleviate the substantial doubt. ASU 2014-15 is effective for annual periods ending after December 15, 2016 and interim periods thereafter with early adoption permitted. We are currently assessing the impact of the adoption of ASU 2014-15 on our future financial statements and related disclosures.
	In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers”. This ASU will supersede most of the existing revenue recognition requirements in U.S. GAAP and will require entities to recognize revenue at an amount that reflects the consideration to which an entity expects to be entitled in exchange for transferring goods or services to a customer. It also requires significantly expanded disclosures regarding the qualitative and quantitative information of an entity’s nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. ASU No. 2014-09 will be effective for us for annual and interim reporting periods beginning after December 15, 2016, with early application not permitted. We have the choice to apply it either retrospectively to each reporting period presented or by recognizing the cumulative effect of applying it at the date of initial application (January 1, 2017) and not adjusting comparative information. We are currently evaluating the requirements of this ASU and have not yet determined its impact on our consolidated financial statements.
	In April 2014, the FASB issued ASU No. 2014-08, “Presentation of Financial Statements and Property, Plant, and Equipment — Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity”, which amends the definition of a discontinued operation by raising the threshold for a disposal to qualify as discontinued operations. ASU 2014-08 will also require entities to provide additional disclosures about discontinued operations as well as disposal transactions that do not meet the discontinued operations criteria. The pronouncement is effective prospectively for all disposals (except disposals classified as held for sale before the adoption date) or components initially classified as held for sale in periods beginning on or after December 15, 2014. We have assessed the impact of the adoption of ASU 2014-08 and have determined that it has no impact on the presented financial statements and related disclosures.

BASIS_OF_PRESENTATION_AND_SIGN2

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2014
Contract Receivables	A summary of contract receivables is as follows:
	We expect to invoice our unbilled receivables once certain milestones or other metrics are reached, and we expect to collect all unbilled amounts. We believe that our provision for losses on uncollectible accounts receivable is adequate for our credit loss exposure.
			31-Dec-14				31-Dec-13
			(in thousands)
	Contract receivables:
	Contracts in progress		$	106,174			$	192,745
	Completed contracts			34,698				77,248
	Retainages			28,586				127,698
	Unbilled			4,303				14,571
	Less allowances			(30,391	)			(30,404	)
	Accounts receivable—trade, net		$	143,370			$	381,858
Retainages on Contracts	The following amounts represent retainages on contracts:
			31-Dec-14				31-Dec-13
			(in thousands)
	Retainages expected to be collected within one year		$	28,586			$	127,698
	Retainages expected to be collected after one year			137,468				65,365
	Total retainages		$	166,054			$	193,063
Summary of Accounts Receivable Other	A summary of accounts receivable—other is as follows:
		31-Dec-14				31-Dec-13
		(In thousands)
	Other taxes receivable	$	31,392			$	14,934
	Receivables from unconsolidated affiliates		20,061				36,181
	Accrued unbilled revenue		15,442				15,696
	Intercompany unbilled cost		3,978				5,373
	Employee receivables		4,336				4,532
	Foreign currency forward contracts		1,173				11,641
	Other		4,706				916
	Accounts receivable-other	$	81,088			$	89,273
Components of Contracts in Progress and Advance Billings on Contracts	A detail of the components of contracts in progress and advance billings on contracts is as follows:
			31-Dec-14				31-Dec-13
			(In thousands)
	Costs incurred less costs of revenue recognized		$	90,191			$	65,113
	Revenues recognized less billings to customers			267,426				360,873
	Contracts in Progress		$	357,617			$	425,986
	Billings to customers less revenue recognized		$	578,896			$	466,205
	Costs incurred less costs of revenue recognized			(379,031	)			(187,276	)
	Advance Billings on Contracts		$	199,865			$	278,929
Summary of Changes in Carrying Amount of Other Non-Current Assets	The following summarizes the changes in the carrying amount of these assets:
		Year ended December 31, 2014				Year ended December 31, 2013
		(In thousands)
	Balance at beginning of period	$	14,951			$	13,761
	Debt issuance costs		47,737				4,905
	Former Credit Agreement debt issuance cost write off		(11,913	)			—
	Amortization of interest expense		(10,999	)			(3,715	)
			39,776				14,951
	Less: Current portion		(12,936	)			—
	Noncurrent portion	$	26,840			$	14,951
Summary of Property Plant Equipment by Asset Category	A summary of property, plant and equipment by asset category is as follows:
			Year Ended December 31,
			2014				2013
			(In thousands)
	Marine Vessels		$	1,241,105			$	1,089,121
	Construction Equipment			496,557				576,855
	Construction in Progress			435,447				408,705
	Buildings			159,623				161,407
	All other			140,831				131,598
	Total Cost		$	2,473,563			$	2,367,686
	Accumulated Depreciation			(830,467	)			(889,009	)
	Net Book Value		$	1,643,096			$	1,478,677
Reclassifications [Member]
Components of Accumulated Other Comprehensive Income (Loss) Included in Stockholders' Equity	Components of accumulated other comprehensive income (loss) (“AOCI”) have been restated to reflect the retrospective change in accounting method for recognizing actuarial gain and losses related to pension and postretirement benefit plans.
	The components of AOCI included in stockholders’ equity are as follows:
		31-Dec-14				31-Dec-13
		(In thousands)
	Foreign currency translation adjustments	$	(15,212	)		$	(2,562	)
	Net gain on investments		241				238
	Net loss on derivative financial instruments		(82,837	)			(45,386	)
	Accumulated other comprehensive loss	$	(97,808	)		$	(47,710	)
	The following tables present the components of AOCI and the amounts that were reclassified during the period:
			Foreign currency translation gain (loss)				Unrealized holding gain (loss) on investments			Deferred gain (loss) on derivatives(1)				TOTAL
			(in thousands)
	Balance, January 1, 2013		$	(3,366	)		$	(2,316	)	$	11,735			$	6,053
	Other comprehensive income (loss) before reclassification			804				920			(52,781	)			(51,057	)
	Amounts reclassified from AOCI		—					1,634			(4,340	)	-2		(2,706	)
	Net current period other comprehensive income (loss)			804				2,554			(57,121	)			(53,763	)
	Balance, December 31, 2013		$	(2,562	)		$	238		$	(45,386	)		$	(47,710	)
	Other comprehensive income (loss) before reclassification			(9,250	)			3			(65,503	)			(74,750	)
	Amounts reclassified from AOCI			(3,400	)		—				28,052		-2		24,652
	Net current period other comprehensive income (loss)			(12,650	)			3			(37,451	)			(50,098	)
	Balance, December 31, 2014		$	(15,212	)		$	241		$	(82,837	)		$	(97,808	)
	-1	Refer to Note 6 for additional details
	-2	Reclassified to cost of operations and gain on foreign currency, net

ACQUISITIONS_DISPOSITIONS_AND_1

ACQUISITIONS, DISPOSITIONS AND RESTRUCTURING (Tables)	12 Months Ended
	Dec. 31, 2014
Discontinued Operations And Disposal Groups [Abstract]
Selected Financial Information Regarding Results of Operations	The following table presents selected financial information regarding the results of operations attributable to our former charter fleet business:
			Year ended
			December 31,
			2012
			(In thousands)
	Revenues		$	8,184
	Gain on disposal of discontinued operations, before taxes			257
	Income before provision for income taxes			3,240
				3,497
	Provision for income taxes			—
	Income from discontinued operations, net of tax		$	3,497
Amounts Incurred and Amounts Expected to be Incurred in Future by Major Type of Cost and by Segment	The following table presents total amounts incurred during the year ended December 31, 2014, as well as amounts incurred from the inception of our restructuring efforts up to December 31, 2014 and amounts expected to be incurred in the future by major type of cost and by segment.
		Incurred in the			Incurred in the			Incurred from restructuring inception to			Estimate of remaining amounts to be incurred			Total
		year ended			year ended			December 31, 2014
		31-Dec-14			December 31, 2013
	AEA
	Impairments and write offs	$	(1,240	)	$	14,163		$	12,923		$	—		$	12,923
	Severance and other personnel-related costs		3,735			9,645			13,380			476			13,856
	Morgan City environmental reserve		—			5,925			5,925			—			5,925
	Morgan City yard-related expenses		6,675			4,175			10,850			5,252			16,102
	Other		—			158			158			3,272			3,430
		$	9,170		$	34,066		$	43,236		$	9,000		$	52,236
	Corporate
	Severance and other personnel-related costs	$	938		$	1,661		$	2,599			—		$	2,599
	Legal and other advisor fees		7,207			—			7,207			—			7,207
	Other		798			—			798			—			798
		$	8,943		$	1,661		$	10,604			—			10,604
	Total	$	18,113		$	35,727		$	53,840		$	9,000		$	62,840
Roll Forward of Accrued Liabilities Associated with Restructuring Activities	The following table presents a roll forward of accrued liabilities associated with our restructuring activities:
		Morgan City			Severance and			Morgan City			Total
		environmental			other			yard-related
		reserve			personnel-			expenses and
					related accruals			other
		(In thousands)
	Balance at January 1, 2013	$	—		$	—		$	—		$	—
	Accruals		5,925			5,820			1,105			12,850
	Payments		—			(4,893	)		—			(4,893	)
	Balance at December 31, 2013	$	5,925		$	927		$	1,105		$	7,957
	Accruals		—			2,626			183			2,809
	Payments		(2,250	)		(3,553	)		(915	)		(6,718	)
	Balance at December 31, 2014	$	3,675		$	—		$	373		$	4,048

LONGTERM_DEBT_AND_NOTES_PAYABL1

LONG-TERM DEBT AND NOTES PAYABLE (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Summary of Redemption Prices Expressed as Percentage	At any time, or from time to time, on or after May 1, 2017, at our option, we may redeem the Notes, in whole or in part, at the redemption prices (expressed as percentages of principal amount of the Notes to be redeemed) set forth below, together with accrued and unpaid interest to the redemption date, if redeemed during the 12-month period beginning May 1 of the years indicated:
	Year		Percentage
	2017			104	%
	2018			102	%
	2019 and thereafter			100	%
Long-Term Debt Obligations	A summary of our long-term debt obligations are as follows:
		December 31,				December 31,
		2014				2013
		(In thousands)
	Long-term debt consists of:
	Senior Notes	$	500,000			$	—
	Term Loan		298,500				—
	NO 105 Construction Financing		49,019				57,189
	Amortizing Notes		40,483				—
	Capital lease obligation		2,802				—
	Other financing		743				—
	NO 102 Construction Financing		—				31,373
		$	891,547			$	88,562
	Less: Amounts due within one year		27,026				39,543
	Total long-term debt	$	864,521			$	49,019
Maturities of Long-Term Debt During Five Years	Maturities of long-term debt during the five years subsequent to December 31, 2014 are as follows:
		(In thousands)
	2015	$	27,026
	2016		28,274
	2017		20,558
	2018		11,616
	2019		295,903
	Thereafter		508,170
	Total	$	891,547

PENSION_PLANS_AND_POSTRETIREME1

PENSION PLANS AND POSTRETIREMENT BENEFITS (Tables)	12 Months Ended
	Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]
Obligations and Funded Status	As described in Note 1, we elected to change our accounting method for recognizing actuarial gains and losses for our pension and other postretirement benefit plans. Accordingly, we have made revisions to previously disclosed amounts, specifically net periodic benefit cost and accumulated other comprehensive income (loss), where certain amounts have been reclassified to retained earnings.
		Domestic Plans						TCN Plan
		Year Ended						Year Ended
		December 31,						December 31,
		2014			2013			2014			2013
		(In thousands)
	Change in benefit obligation:
	Benefit obligation at beginning of year	$	583,421		$	615,361		$	40,396		$	48,009
	Interest cost		26,972			23,996			1,900			1,867
	Actuarial loss (gain)		36,885			(25,137	)		4,438			(5,860	)
	Terminated Vested Employees Lump Sum Settlement (1)		(54,551	)		—			—			—
	Curtailments and other adjustments		—			3,850			—			(621	)
	Benefits paid		(36,095	)		(34,649	)		(2,749	)		(2,999	)
	Benefit obligation at end of year	$	556,632		$	583,421		$	43,985		$	40,396
	Change in plan assets:
	Fair value of plan assets at beginning of year		567,801			605,892			43,483			39,039
	Actual return on plan assets		73,114			(4,982	)		1,372			6,943
	Company contributions		1,552			1,540			—			500
	Terminated Vested Employees Lump Sum Settlement(1)		(54,551	)		—			—			—
	Benefits paid		(36,095	)		(34,649	)		(2,749	)		(2,999	)
	Fair value of plan assets at end of year		551,821			567,801			42,106			43,483
	Funded status	$	(4,811	)	$	(15,620	)	$	(1,879	)	$	3,087
	Amounts recognized in balance sheet consist of:
	Other Assets	$	12,685		$	598		$	—		$	3,087
	Accrued pension liability—current		(1,519	)		(1,519	)		—			—
	Pension liability		(15,977	)		(14,699	)		(1,879	)		—
	Accrued benefit liability		(17,496	)		(16,218	)		(1,879	)		—
	Net (Liability)/ Asset	$	(4,811	)	$	(15,620	)	$	(1,879	)	$	3,087
	-1	During the year ended December 31, 2014 we offered our former employees with vested pension benefits under the McDermott Plan a one-time voluntary opportunity, for a six-week period, to receive the value of their pension benefit as a lump-sum payment. This program resulted in a $54.6 million release of pension liability and a corresponding decrease in plan assets.
		Domestic Plans						TCN Plan
		Year Ended						Year Ended
		December 31,						December 31,
		2014			2013			2014			2013
		(In thousands)
	Supplemental information:
	Plans with accumulated benefit obligation in excess of plan assets
	Projected benefit obligation	$	556,632		$	583,421		$	43,985		$	40,396
	Accumulated benefit obligation	$	556,632		$	583,421		$	43,985		$	40,396
	Fair value of plan assets	$	551,821		$	567,801		$	42,106		$	43,483
Weighted Average Assumptions used Determine Net Periodic Benefit Obligations	Assumptions
		Domestic Plans						TCN Plan
		2014			2013			2014			2013
	Weighted average assumptions used to determine net periodic benefit obligations at December 31:
	Discount rate		4	%		4.8	%		3.8	%		4.8	%
	Rate of compensation increase		N/A			N/A			N/A			N/A
Net Periodic Benefit Cost
		Domestic Plans									TCN Plan
		Year Ended									Year Ended
		December 31,									December 31,
		2014			2013			2012			2014			2013			2012
		(In thousands)
	Supplemental information:
	Components of periodic benefit cost:
	Interest cost	$	26,972		$	23,996		$	26,521		$	1,900		$	1,867		$	1,843
	Expected return on plan assets		(27,501	)		(38,306	)		(35,809	)		(2,961	)		(2,602	)		(2,443	)
	Current period (gain) loss		(8,728	)		22,002			19,580			6,027			(10,822	)		3,998
	Net periodic benefit (gain) cost	$	(9,257	)	$	7,692		$	10,292		$	4,966		$	(11,557	)	$	3,398
	Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31:
	Discount rate		4.8	%		4	%		4.8	%		4.8	%		4	%		4.8	%
	Expected return on plan assets		5	%		6.5	%		6.5	%		6.9	%		6.9	%		6.9	%
	Rate of compensation increase		N/A			N/A			N/A			N/A			N/A			N/A
Asset Allocations, by Asset Class	The following is a summary of the asset allocations at December 31, 2014 and 2013 by asset category. The estimated allocation for 2015, by asset class, is expected to remain approximately the same as the year ended December 31, 2014.
		Domestic Plans						TCN Plan
		2014			2013			2014			2013
	Asset Category:
	Fixed Income		85	%		85	%		28	%		25	%
	Equity Securities		15	%		15	%		72	%		75	%
	Total		100	%		100	%		100	%		100	%
Total Investments Plans Measured at Fair Value	The following is a summary of total investments for our plans, measured at fair value at December 31, 2014 and 2013.
		12/31/14			Level 1			Level 2			Level 3
		(In thousands)
	Pension Benefits:
	Fixed Income	$	471,704		$	64,575		$	402,116		$	5,013
	Equities	$	110,267			109,781			486		—
	Cash and Accrued Items	$	11,956			11,956		—			—
	Total Investments	$	593,927		$	186,312		$	402,602		$	5,013
		12/31/13			Level 1			Level 2			Level 3
		(In thousands)
	Pension Benefits:
	Fixed Income	$	479,529		$	58,556		$	417,204		$	3,769
	Equities	$	119,669			31,687			87,982		—
	Cash and Accrued Items	$	12,086			12,086		—			—
	Total Investments	$	611,284		$	102,329		$	505,186		$	3,769
Changes in Level 3 Fixed Income Instrument Measured on Recurring Basis	The following is a summary of the changes in our Level 3 fixed income instruments measured on a recurring basis for the years ended December 31, 2014 and 2013:
		December 31,
		2014			2013
		(In thousands)
	Balance at beginning of period	$	3,769		$	1,576
	Purchases, net		1,347			2,120
	Total unrealized gains (loss)		(103	)		73
	Balance at end of period	$	5,013		$	3,769
Expected Employer Contributions and Expected Benefit Payments
	Cash Flows
		Domestic Plans			TCN Plan
		(In thousands)
	Expected employer contributions to trusts of defined benefit plans:
	2015	—			—
	Expected benefit payments:
	2015	$	37,344		$	2,379
	2016	$	37,288		$	2,799
	2017	$	37,060		$	2,690
	2018	$	36,887		$	2,498
	2019	$	36,633		$	2,604
	2020-2024	$	178,455		$	11,540

INVESTMENTS_Tables

INVESTMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Investments Debt And Equity Securities [Abstract]
Available-For-Sale Securities	The following is a summary of our available-for-sale securities:
		Year Ended December 31, 2014
		Amortized Cost		Gross Unrealized Gains		Estimated Fair Value
		(In thousands)
	Mutual funds(1)	$	1,975	$	241	$	2,216
	Commercial paper(2)		1,699		—	$	1,699
		$	3,674	$	241	$	3,915
		Year Ended December 31, 2013
		Amortized Cost		Gross Unrealized Gains		Estimated Fair Value
		(In thousands)
	Mutual funds(1)	$	1,975	$	198	$	2,173
	Commercial paper(2)		3,699		—	$	3,699
	Asset-backed securities and collateralized mortgage obligations(3)(4)(5)		7,599		40	$	7,639
		$	13,273	$	238	$	13,511
	-1	Various U.S. equities and other investments managed under mutual funds.
	-2	Commercial paper with maturities less than one year.
	-3	Included in our asset-backed securities and collateralized mortgage obligations is approximately $5.6 million of commercial paper secured by mortgage-backed securities.
	-4	Asset-backed and mortgage-backed securities with maturities of up to 26 years.
	-5	Asset-backed and mortgage-backed securities and collateralized mortgage obligations is net of a $1.6 million impairment that was recognized in the year ended December 31, 2013.
Proceeds, Gross Realized Gains and Gross Realized Losses From Sales and Maturities Available-For-Sale Securities	Proceeds, gross realized gains and gross realized losses from sales and maturities of available-for-sale securities were as follows:
		Proceeds		Gross Realized Gains		Gross Realized Losses
		(In thousands)
	Year Ended December 31, 2014	$	12,978	$	—	$	(326	)
	Year Ended December 31, 2013	$	43,959	$	—	$	—
	Year Ended December 31, 2012	$	191,298	$	—	$	—

DERIVATIVE_FINANCIAL_INSTRUMEN1

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	The following tables summarize our derivative financial instruments:
	Asset and Liability Derivatives
		December 31,			December 31,
		2014			2013
		(in thousands)
	Derivatives Designated as Hedges:
	Location:
	Accounts receivable-other	$	1,173		$	11,641
	Other assets		16			1,647
	Total asset derivatives	$	1,189		$	13,288
	Accounts payable	$	32,431		$	20,209
	Other liabilities		15,670			21,846
	Total liability derivatives	$	48,101		$	42,055
Effects of Derivative Instruments on Financial Statements	The Effects of Derivative Instruments on our Financial Statements
		December 31,
		2014			2013
		(in thousands)
	Derivatives Designated as Hedges:
	Amount of gain/(loss) recognized in AOCI	$	(65,503	)	$	(52,781	)
	Income (loss)  reclassified from AOCI into income: effective portion
	Location
	Cost of operations	$	26,418		$	1,715
	Gain(loss) recognized in income (loss): ineffective portion and amount excluded from effectiveness testing
	Location
	Gain (loss) on foreign currency—net	$	6,910		$	13,247

FAIR_VALUES_OF_FINANCIAL_INSTR1

FAIR VALUES OF FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Available-for-Sale Securities Measured at Fair Value	The following is a summary of our available-for-sale securities measured at fair value:
		31-Dec-14
		Total				Level 1				Level 2				Level 3
		(in thousands)
	Mutual funds(1)	$	2,216			$	—			$	2,216			$	—
	Commercial paper		1,699				—				1,699				—
	Total	$	3,915			$	—			$	3,915			$	—
		31-Dec-13
		Total				Level 1				Level 2				Level 3
		(in thousands)
	Mutual funds(1)	$	2,173			$	—			$	2,173			$	—
	Commercial paper		3,699				—				3,699				—
	Asset-backed securities and collateralized mortgage obligations(2)		7,639				—				2,082				5,557
	Total	$	13,511			$	—			$	7,954			$	5,557
	-1	Various U.S. equities and other investments managed under mutual funds
	-2	Asset-backed and mortgage-backed securities with maturities of up to 26 years
Changes in Level Three Instrument Measured on Recurring Basis	The following is a summary of the changes in our Level 3 instrument measured on a recurring basis for the years ended December 31, 2014 and 2013:
		December 31,
		2014				2013
		(in thousands)
	Balance at beginning of period	$	5,557			$	6,343
	Total realized and unrealized gains (losses)		(375	)			484
	Sales and principal repayments		(5,182	)			(1,270	)
	Balance at end of period	$	—			$	5,557
Estimated Fair Values of Financial Instruments	The estimated fair values of certain of our financial instruments are as follows:
			31-Dec-14								31-Dec-13
			Carrying				Fair Value				Carrying				Fair Value
			Amount								Amount
			(In thousands)
	Balance Sheet Instruments
	Cash and cash equivalents		$	665,309			$	665,309			$	118,702			$	118,702
	Restricted cash and cash equivalents		$	187,585			$	187,585			$	23,652			$	23,652
	Investments		$	3,915			$	3,915			$	13,511			$	13,511
	Debt		$	(891,547	)		(737,980		)		$	(88,562	)		$	(90,005	)
	Forward contracts		$	(46,912	)		$	(46,912	)		$	(28,767	)		$	(28,767	)

STOCKBASED_COMPENSATION_Tables

STOCK-BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Total Stock-Based Compensation Expense Recognized	Total compensation expense recognized for the years ended December 31, 2014, 2013 and 2012 was as follows:
			December 31,
			2014				2013				2012
			(In thousands)
	Stock options		$	1,747			$	4,321			$	3,984
	Restricted stock and restricted stock units			14,417				12,326				6,880
	Performance shares			352				4,453				4,505
	Total		$	16,516			$	21,100			$	15,369
Total Gross Unrecognized Estimated Compensation Expense and Expected Weighted-Average Periods	The components of the total gross unrecognized estimated compensation expense and their expected remaining weighted-average periods for expense recognition are as follows (amounts in thousands; periods in years):
			Amount				Weighted-Average Period
	Stock options		$	1,457				1.1
	Restricted stock and restricted stock units		$	21,164				2.1
	Performance shares		$	4,140				1.9
Weighted Average Assumptions	The fair value of each option grant was estimated with the following weighted-average assumptions:
			Year Ended December 31,
			2014		2013				2012
	Risk-free interest rate		—			0.68	%			0.77	%
	Expected volatility		—			56	%			59	%
	Expected life of the option in years		—			4.6				4.6
	Expected dividend yield		—			0	%			0	%
Activity for Stock Option	The following table summarizes activity for our stock options for the year ended December 31, 2014 (share data in thousands):
			Number of Option Shares				Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
													(in millions)
	Outstanding at beginning of period			3,762			$	11.78
	Granted			—				—
	Exercised			(169	)			2.14
	Cancelled/expired/forfeited			(300	)			12.75
	Outstanding at end of period(1)			3,293			$	12.18			3.3 Years		$	0
	Exercisable at end of period			2,521			$	12.47			2.8 Years		$	0
	-1	Of the remaining outstanding options at the end of the period, we expect approximately 0.7 million shares underlying the options to vest at a weighted-average exercise price of $11.27.
Nonvested Restricted Stock, Restricted Stock Units and Changes	Nonvested restricted stock and restricted stock units and changes during the year ended December 31, 2014 were as follows (share data in thousands):
			Number of Shares				Weighted-Average Grant Date Fair Value
	Nonvested at beginning of period			3,767			$	9.18
	Granted			2,536				7.56
	Vested			(1,097	)			10.69
	Cancelled/forfeited			(558	)			8.66
	Nonvested at end of period			4,648			$	8
Nonvested Performance Shares and Performance Unit Awards and Changes	Nonvested performance share awards and changes during the year ended December 31, 2014 were as follows (share data in thousands):
			Number of Shares				Weighted-Average Grant Date Fair Value
	Nonvested at beginning of period			1,168			$	13.7
	Granted			626				7.76
	Vested			—				—
	Cancelled/forfeited			(342	)			11.97
	Nonvested at end of period			1,452			$	11.55

INCOME_TAXES_Tables

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Provision for income taxes	The provision for income taxes consisted of:
			Year Ended December 31,
			2014			2013				2012
			(In thousands)
	Other than U.S.:
	Current		$	21,619		$	54,410			$	125,402
	Deferred			(1,546	)		(5,359	)			3,802
	Total provision for income taxes		$	20,073		$	49,051			$	129,204
Geographic Source of Income Before Provision for Income Taxes	The geographic sources of income before income taxes are as follows:
			Year Ended December 31,
			2014			2013				2012
			(In thousands)
	U.S.			(31,124	)	$	(151,904	)		$	(92,025	)
	Other than U.S.			(14,197	)		(288,955	)			422,967
	Income before provision for income taxes		$	(45,321	)	$	(440,859	)(1)		$	330,942	-1
Reconciliation of Panama Statutory Federal Tax Rate to Consolidated Effective Tax Rate	The following is a reconciliation of the Panama statutory federal tax rate to the consolidated effective tax rate:
			Year Ended December 31,
			2014			2013				2012
	Panama federal statutory rate			25	%		25	%			25	%
	Non-Panama operations			3.5	%		-16.4	%			-4.4	%
	Valuation allowance for deferred tax assets			-86.6	%		-19.1	%			14.7	%
	Audit settlements and reserves			14.2	%		-0.9	%			3	%
	Other			-0.4	%		0.3	%			0.7	%
	Effective tax rate attributable to continuing operations			-44.3	%		-11.1	%	-1		39	-1%
	-1	Rate has been updated to reflect the effect of a pension accounting change, as discussed in Note 1. There has been no change in overall provision for income taxes.
Significant Components of Deferred Tax Assets and Liabilities	Significant components of deferred tax assets and liabilities were as follows:
			December 31,
			2014			2013
	Deferred tax assets:
	Pension liability		$	10,976		$	16,658
	Accrued liabilities for incentive compensation			19,015			15,032
	Net operating loss carryforward			294,722			259,600
	State net operating loss carryforward			21,296			24,679
	Long-term contracts			39,817			13,504
	Other			1,549			4,936
	Total deferred tax assets			387,375			334,409
	Valuation allowance for deferred tax assets			(331,589	)		(292,388	)
	Deferred tax assets		$	55,786		$	42,021
	Deferred tax liabilities:
	Property, plant and equipment			28,815			19,115
	Prepaid drydock			10,280			13,025
	Investments in joint ventures and affiliated companies			13,583			8,354
	Unrealized exchange gains and other			3,162			3,236
	Total deferred tax liabilities		$	55,840		$	43,730
	Net deferred tax liability		$	54		$	1,709
			December 31,
			2014			2013
	Deferred tax assets and liabilities in the accompanying consolidated balance sheets include:
	Current deferred tax assets		$	7,514		$	7,091
	Noncurrent deferred tax assets			17,313			16,766
	Total		$	24,827		$	23,857
	Current deferred tax liabilities		$	19,753		$	17,892
	Noncurrent deferred tax liabilities			5,128			7,674
	Total		$	24,881		$	25,566
	Net deferred tax liability		$	54		$	1,709
Reconciliation of Unrecognized Tax Benefits	A reconciliation of unrecognized tax benefits is as follows (in thousands):
			Year Ended December 31,
			2014			2013				2012
	Balance at beginning of period		$	40,613		$	40,516			$	31,664
	Increases based on tax positions taken in the current year			3,479			539				10,830
	Increases based on tax positions taken in prior years			3,195			3,831				158
	Decreases based on tax positions taken in prior years			(863	)		(3,688	)			(1,465	)
	Decreases due to lapse of applicable statute of limitation			(12,318	)		(585	)			(671	)
	Balance at end of period		$	34,106		$	40,613			$	40,516

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share:
		Year Ended December 31,
		2014			2013			2012
		(In thousands, except share and per share amounts)
	Income (loss) from continuing operations less noncontrolling interest	$	(75,994	)	$	(508,868	)	$	190,968
	Income from discontinued operations, net of tax		—			—			3,497
	Net income (loss) attributable to McDermott International, Inc.	$	(75,994	)	$	(508,868	)	$	194,465
	Weighted average common shares (basic)		237,229,086			236,514,584			235,638,422
	Effect of dilutive securities:
	Stock options, restricted stock and restricted stock units		—			—			1,981,266
	Adjusted weighted average common shares and assumed exercises of stock options and vesting of stock awards (diluted)		237,229,086			236,514,584			237,619,688
	Basic earnings (loss) per share
	Income (loss) from continuing operations less noncontrolling interest		(0.32	)		(2.15	)		0.81
	Income (loss) from discontinued operations, net of tax		—			—			0.01
	Net income (loss) attributable to McDermott International, Inc.		(0.32	)		(2.15	)		0.83
	Diluted earnings (loss) per share:
	Income (loss) from continuing operations less noncontrolling interest		(0.32	)		(2.15	)		0.8
	Income (loss) from discontinued operations, net of tax		—			—			0.01
	Net income (loss) attributable to McDermott International, Inc.		(0.32	)		(2.15	)		0.82

SEGMENT_REPORTING_Tables

SEGMENT REPORTING (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Information about Operations in Different Segments	1. Information about Operations:
			Year Ended December 31,
			2014			2013			2012
			(In thousands)
	Revenues:
	ASA		$	937,615		$	953,838		$	1,575,682
	MEA			795,666			1,167,804			1,591,881
	AEA			567,608			537,290			474,061
	Total revenues(1):		$	2,300,889		$	2,658,932		$	3,641,624
	Operating income (loss):
	ASA		$	55,412		$	(72,159	)	$	236,874
	MEA			11,421			(169,224	)		138,733
	AEA			(49,337	)		(215,362	)		(68,468	)
	Corporate			(8,942	)		—			—
	Total operating income (loss)		$	8,554		$	(456,745	)	$	307,139
	Capital expenditures:
	ASA		$	154,735		$	117,060		$	219,920
	MEA			99,974			127,498			29,736
	AEA			53,431			22,177			32,699
	Corporate and Other			13,047			17,227			3,955
	Total capital expenditures(2):		$	321,187		$	283,962		$	286,310
	Depreciation and amortization:
	ASA		$	19,020		$	18,693		$	23,797
	MEA			31,876			31,699			31,119
	AEA			34,494			26,788			24,589
	Corporate and Other			7,795			7,400			6,935
	Total depreciation and amortization:		$	93,185		$	84,580		$	86,440
	Drydock amortization
	ASA		$	6,255		$	8,917		$	9,487
	MEA			2,011			2,133			2,489
	AEA			11,453			7,417			13,569
	Total drydock amortization		$	19,719		$	18,467		$	25,545
	-1	Intercompany transactions were not significant for the years ended December 31, 2014, 2013 and 2012.
	-2	Total capital expenditures represent expenditures for which cash payments were made during the period. Capital expenditures for the year ended December 31, 2014 include $27.0 million of cash payments for accrued capital expenditures outstanding at December 31, 2013. Capital expenditures for the year ended December 31, 2013 exclude approximately $48.3 million in accrued capital expenditures. There were no accrued capital expenditures for the year ended December 31, 2012.
Significant Impact of Customers on Company Segments	2. Information about our most significant Customers
	Our customers, which significantly impacted our segments during the years ended December 31, 2014, 2013 and 2012, were as follows:
			% of
			Consolidated			Reportable
			Revenues			Segment
	Year Ended December 31, 2014:
	Saudi Aramco			27	%	MEA
	Inpex Operations Australia Pty Ltd.			25	%	ASA
	Year Ended December 31, 2013:
	Saudi Aramco			25	%	MEA
	Azerbaijan International Oil Company			13	%	MEA
	Year Ended December 31, 2012:
	Exxon Mobil Corporation			24	%	ASA
	Saudi Aramco			22	%	MEA
	BHP Billiton Petroleum Pty Ltd.			10	%	ASA
Information about Service Lines and Operations in Different Geographic Areas	3. Information about our Service Lines and Operations in Different Geographic Areas:
			Year Ended December 31,
			2014			2013			2012
			(In thousands)
	Service line revenues:
	Installation Operations		$	1,041,525		$	1,155,516		$	1,885,143
	Fabrication Operations			266,854			370,854			487,215
	Project Services and Engineering
	Operations			314,776			341,084			337,774
	Procurement Activities			677,734			791,478			931,492
			$	2,300,889		$	2,658,932		$	3,641,624
	Geographic revenues:
	Saudi Arabia		$	616,659		$	720,879		$	1,057,930
	Australia			614,164			481,123			1,485,503
	Brazil			290,561			176,475			87,597
	Indonesia			150,205			144,538			—
	United States			148,606			126,986			119,785
	Mexico			130,642			117,813			55,974
	Azerbaijan			111,382			345,742			268,419
	Malaysia			98,004			329,689			67,553
	United Arab Emirates			57,249			19,528			156,395
	Other countries			83,417			196,159			342,468
			$	2,300,889		$	2,658,932		$	3,641,624
Information about Segment Assets and Property, Plant and Equipment by Country	4. Information about our Segment Assets and Property, Plant and Equipment by Country:
			Year Ended December 31,
			2014			2013			2012
			(In thousands)
	Segment assets:
	ASA		$	601,394		$	1,030,823		$	1,402,923
	MEA			990,671			1,116,916			1,006,284
	AEA			979,310			535,326			536,734
	Corporate and Other			872,582			124,306			387,686
	Total assets		$	3,443,957		$	2,807,371		$	3,333,627
	Property, plant and equipment, net(1):
	Brazil		$	458,199		$	192,101		$	52,955
	United Arab Emirates			306,320			145,635			110,292
	Mexico			245,226			96,830			61,390
	Singapore			219,570			306,948			324,106
	Indonesia			189,064			154,630			144,322
	Spain			154,078			94,917			15,159
	United States			46,537			54,647			201,815
	Saudi Arabia			20,561			191,400			102,334
	Australia			—			14			212,955
	Malaysia			—			240,042			—
	Other countries			3,541			1,513			56,463
	Total property, plant and equipment, net		$	1,643,096		$	1,478,677		$	1,281,791
	-1	Our marine vessels are included in the country in which they were located as of year-end.
Other Information about Segment	5. Information about our Unconsolidated Affiliates:
			Year Ended December 31,
			2014			2013			2012
			(In thousands)
	Equity in loss of unconsolidated affiliates:
	ASA		$	(10,009	)	$	(10,738	)	$	(10,123	)
	AEA			4,829			(4,275	)		(6,016	)
	MEA			(2,668	)		(1,103	)		(580	)
			$	(7,848	)	$	(16,116	)	$	(16,719	)
	Investments in unconsolidated affiliates:
	ASA		$	35,722		$	49,423
	AEA			1,598			120
	Corporate			866			993
	Total investments in unconsolidated affiliates		$	38,186		$	50,536

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Future Minimum Payments Required under Operating Leases that have Initial or Remaining Noncancellable Lease Terms in Excess of One Year	Future minimum payments required under operating leases that have initial or remaining noncancellable lease terms in excess of one year at December 31, 2014 are as follows (in thousands):
	Fiscal Year Ending December 31,	Amount
	2015	$	25,051
	2016	$	18,531
	2017	$	15,155
	2018	$	11,457
	2019	$	12,288
	Thereafter	$	127,373

QUARTERLY_FINANCIAL_DATA_UNAUD1

QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Selected Unaudited Quarterly Financial Information	The following tables set forth selected unaudited quarterly financial information for the years ended December 31, 2014 and 2013:
			Quarter Ended
			March 31,					June 30,					September 30,					December 31,
			2014					2014					2014					2014
			(In thousands, except per share data amounts)
	Revenues		$	603,811				$	476,083				$	414,595				$	806,400
	Operating income (loss)			(38,209	)				31,525					(10,711	)				25,949
	Net income (loss)			(45,984	)				(5,698	)				(25,946	)				12,234
	Net income attributable to non-controlling interest			536					1,699					4,306					4,059
	Net income (loss) attributable to McDermott International, Inc.			(46,520	)				(7,397	)				(30,252	)				8,175
			Per Share Data
			Quarter Ended
			March 31,					June 30,					September 30,					December 31,
			2014					2014					2014					2014
	Basic loss per common share:
	Income (loss) from continuing operations less noncontrolling interest			(0.20	)				(0.03	)				(0.13	)				0.03
	Net loss attributable to McDermott International, Inc.			(0.20	)				(0.03	)				(0.13	)				0.03
	Diluted loss per common share:
	Income (loss) from continuing operations less noncontrolling interest			(0.20	)				(0.03	)				(0.13	)				0.03
	Net loss attributable to McDermott International, Inc.			(0.20	)				(0.03	)				(0.13	)				0.03
	-1	Operating income for the quarter ended March 31, 2014 was influenced by negative changes in estimates on projects, mainly in our MEA segment.
	-2	Operating income for the quarter ended June 30, 2014 was influenced by a gain on the sale of assets, mainly of our Harbor Island facility of approximately $25.1 million and some of Morgan City facility assets.
	-3	Operating income for the quarter ended December 31, 2014 was influenced by positive changes in estimates and recognition of approved change orders.
			Quarter Ended
			March 31,			June 30,				September 30,			December 31,
			2013			2013				2013			2013
			(In thousands, except per share data amounts)
	Revenues		$	807,488		$	647,250			$	686,856		$	517,338
	Operating income (loss)			56,688			(146,321	)			(49,216	)		(317,896	)
	Net income (loss)			27,973			(142,922	)			(55,609	)		(319,352	)
	Net income attributable to non-controlling interest			3,765			3,286				5,023			6,884
	Net income (loss) attributable to McDermott International, Inc.			24,208			(146,208	)			(60,632	)		(326,236	)
			Per Share Data
			Quarter Ended
			March 31,			June 30,				September 30,			December 31,
			2013			2013				2013			2013
	Basic loss per common share:
	Income (loss) from continuing operations less noncontrolling interest			0.1			(0.62	)			(0.26	)		(1.38	)
	Net loss attributable to McDermott International, Inc.			0.1			(0.62	)			(0.26	)		(1.38	)
	Diluted loss per common share:
	Income (loss) from continuing operations less noncontrolling interest			0.1			(0.62	)			(0.26	)		(1.38	)
	Net loss attributable to McDermott International, Inc.			0.1			(0.62	)			(0.26	)		(1.38	)
	-1	Operating income for the quarter ended June 30, 2013 was influenced by increased cost estimates on projects in our MEA and ASA segments, as well as restructuring charges.
	-2	Operating income for the quarter ended September 30, 2013 was influenced by increased project losses.
	-3	Operating income for the quarter ended December 31, 2013 was influenced by increased cost estimates, impairment losses of $84.3 million and restructuring charges.
Summary of Adjustments on Previously Reported Quarterly Results	The impact of these adjustments on previously reported quarterly results is summarized below (in thousands, except per share amounts).
			Quarter ended March 31,							Quarter ended June 30,						Quarter ended September 30,						Quarter ended December 31,
	Increase (decrease) to		2014			2013				2014			2013			2014				2013		2014(1)		2013(1)
	Operating income (loss)		$	3,433		$	3,655			$	3,433		$	3,215		$	3,432			$	3,438	$	6,369	$	(2,263	)
	Net income (loss)		$	3,433		$	3,655			$	3,433		$	3,215		$	3,432			$	3,438	$	6,369	$	(2,263	)
	Basic loss per common share:
	Net loss attributable to McDermott International, Inc.			0.01			0.02				0.01			0.01			0.01				0.01		—		(0.01	)
	Diluted loss per common share:
	Net loss attributable to McDermott International, Inc.			0.01			0.02				0.01			0.01			0.01				0.01		—		(0.01	)
	-1	Impact of the adjustments on quarters ended December 31, 2014 and 2013 includes effect of the actuarial adjustment recognized at the end of the year.

EFFECT_OF_ACCOUNTING_CHANGE_Ta

EFFECT OF ACCOUNTING CHANGE (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Changes And Error Corrections [Abstract]
Schedule of Consolidated Results and Financial Position	The impact of these adjustments on our consolidated results and financial position is as follows:
		2014									2013									2012
		New method			Historical Method			Net Effect of Change			As Adjusted			Previously Reported			Net Effect of Change			As Adjusted		Previously Reported			Net Effect of Change
		(In thousands, except per share data amounts)
	Consolidated Statements of Operations:
	Selling, general and administrative expenses	$	208,564		$	225,231		$	(16,667	)	$	193,126		$	201,171		$	(8,045	)	$	218,162	$	205,974		$	12,188
	Operating Income (Loss)	$	8,554		$	(8,113	)	$	16,667		$	(456,745	)	$	(464,790	)	$	8,045		$	307,139	$	319,327		$	(12,188	)
	Net Income (Loss)	$	(65,394	)	$	(82,061	)	$	16,667		$	(489,910	)	$	(497,955	)	$	8,045		$	205,235	$	217,423		$	(12,188	)
	Net Income (Loss) Attributable to McDermott International, Inc.	$	(75,994	)	$	(92,661	)	$	16,667		$	(508,868	)	$	(516,913	)	$	8,045		$	194,465	$	206,653		$	(12,188	)
	Earnings per common share:
	Basic:
	Net Income (Loss) Attributable to McDermott International, Inc.		(0.32	)		(0.39	)		0.07			(2.15	)		(2.19	)		0.04			0.83		0.88			(0.05	)
	Diluted:
	Net Income (Loss) Attributable to McDermott International, Inc.		(0.32	)		(0.39	)		0.07			(2.15	)		(2.19	)		0.04			0.82		0.87			(0.05	)
	Consolidated Statements of Comprehensive Income (Loss):
	Unrealized gain (loss) on benefit plan revaluation	$	—		$	2,937		$	(2,937	)	$	—		$	(9,542	)	$	9,542		$	—	$	(23,821	)	$	23,821
	Amortization of benefit plan	$	—		$	13,730		$	(13,730	)	$	—		$	17,587		$	(17,587	)	$	—	$	11,633		$	(11,633	)
	costs
	Consolidated Balance Sheets:
	Retained Earnings/ (Accumulated Deficit)	$	(239,572	)	$	(163,818	)	$	(75,754	)	$	(163,578	)	$	(71,157	)	$	(92,421	)
	Accumulated Other Comprehensive	$	(97,808	)	$	(173,562	)	$	75,754		$	(47,710	)	$	(140,131	)	$	92,421
	Income (Loss)
	Consolidated Statements of Cash Flows:
	Net Income (Loss)	$	(65,394	)	$	(82,061	)	$	16,667		$	(489,910	)	$	(497,955	)	$	8,045		$	205,235	$	217,423		$	(12,188	)
	Other non-cash items	$	(3,605	)	$	8,961		$	(12,566	)	$	(6,029	)	$	(3,463	)	$	(2,566	)	$	6,837	$	8,367		$	(1,530	)
	Other assets and liabilities(1)	$	11,653		$	15,754		$	(4,101	)	$	(46,301	)	$	(40,822	)	$	(5,479	)	$	55,303	$	39,535		$	15,768
	Pension liability and accrued postretirement and employee benefits	$	-1,861		$	-1,861		$	—		$	-30,828		$	-30,828		$	—		$	34,847	$	36,897		$	(2,050	)
	Other assets and liabilities for the years ended December 31, 2013 and 2012 have been adjusted to conform with the current year presentation for the non-cash impacts of gain of foreign exchange, as described in Note 1.

Recovered_Sheet1

Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended			1 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
	Country								Project	Segment
	Employee								Country
									Employee
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of countries	20								20
Number of employees	13,400								13,400
Gain on foreign currency									$10,310,000	$13,247,000	$23,116,000
Revenues	806,400,000	414,595,000	476,083,000	603,811,000	517,338,000	686,856,000	647,250,000	807,488,000	2,300,889,000	2,658,932,000	3,641,624,000
Cost of operations									2,113,013,000	2,801,426,000	3,100,009,000
Percentage of completion to recognize expected profit	70.00%								70.00%
Number of projects accounted under deferred profit recognition policy									5
Changes in project estimates										315,100,000
Number of operating segments										3
Cost increase percentage											8.00%
Retainages expected to be collected in 2016	86,000,000								86,000,000
Retainages expected to be collected in 2017	51,500,000								51,500,000
Allowance for doubtful accounts	0				0				0	0
Contracts in progress									357,617,000	425,986,000
Advance billing on contracts									199,865,000	278,929,000
Interest incurred									85,400,000	8,900,000	8,900,000
Interest capitalized									23,900,000	8,600,000	8,600,000
Depreciation expense									93,200,000	84,600,000	86,400,000
Goodwill impairment charges					46,700,000
Intangible assets impairment charges	1,700,000
Reduction in self-insurance accruals									-8,000,000	-7,200,000	-6,800,000
CSV 108
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Estimated cancellation costs												10,700,000
Asset impairment charges										37,800,000
Minimum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Equity method of accounting investment ownership	20.00%								20.00%
Minimum [Member] | Building [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Property, plant and equipment economic useful lives									8 years
Minimum [Member] | Machinery and Equipment [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Property, plant and equipment economic useful lives									3 years
Minimum [Member] | Other Capitalized Property Plant and Equipment
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Property, plant and equipment economic useful lives											3 years
Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Equity method of accounting investment ownership	50.00%								50.00%
Maximum [Member] | Building [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Property, plant and equipment economic useful lives									33 years
Maximum [Member] | Machinery and Equipment [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Property, plant and equipment economic useful lives									28 years
Maximum [Member] | Other Capitalized Property Plant and Equipment
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Property, plant and equipment economic useful lives											5 years
Altamira [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Loss on contracts									146,400,000
Brazil [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Loss on contracts									102,200,000
Saudi Arabia [Member] | EPCI projects [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Loss on contracts									92,900,000
Project completion year									2016
Saudi Arabia [Member] | Hook-up [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Loss on contracts									9,600,000
Project completion year									2015
Active Projects
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Loss on contracts									401,200,000
Middle East [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Revenues									795,666,000	1,167,804,000	1,591,881,000
Changes in project estimates									4,400,000	174,400,000
Number of project									4	4
Partial offset on estimated costs on project												53,500,000
Project charges											13,000,000
Middle East [Member] | Saudi Arabia [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Partial offset on estimated costs on project	20,500,000
Middle East [Member] | Saudi Arabia [Member] | EPCI projects [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Partial offset on estimated costs on project									53,500,000
Middle East [Member] | Saudi Arabia [Member] | Project Two [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Increase (decrease) in project estimated costs	19,200,000				16,500,000				19,200,000	16,500,000
Middle East [Member] | Saudi Arabia [Member] | Project One
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Increase (decrease) in project estimated costs	22,500,000				62,500,000				22,500,000	62,500,000
Partial offset on estimated costs on project									43,000,000
Middle East [Member] | Saudi Arabia [Member] | Project Three
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Increase (decrease) in project estimated costs	12,200,000				16,400,000				12,200,000	16,400,000
Americas, Europe and Africa [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Revenues									567,608,000	537,290,000	474,061,000
Loss on contracts										9,700,000
Changes in project estimates									37,200,000	78,500,000
Number of project									5	6
Additional costs incurred due to poor labor productivity in morgan city					9,300,000					9,300,000
Recognized claim revenue reversed										10,000,000
Project charges											16,000,000
Americas, Europe and Africa [Member] | Morgan City environmental reserve [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Increase (decrease) in project estimated costs	-7,800,000								-7,800,000
Americas, Europe and Africa [Member] | EPCI projects [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Increase (decrease) in project estimated costs	68,900,000								68,900,000
Partial offset on estimated costs on project									39,800,000
Americas, Europe and Africa [Member] | Altamira [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Changes in project estimates										40,900,000
Americas, Europe and Africa [Member] | Brazil [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Loss on contracts									50,100,000
Increase (decrease) in project estimated costs					8,600,000					8,600,000
Americas, Europe and Africa [Member] | Gulf Of Mexico
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Increase (decrease) in project estimated costs	5,500,000								5,500,000
Americas, Europe and Africa [Member] | Gulf Of Mexico | EPCI projects [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Increase (decrease) in project estimated costs	-5,200,000								-5,200,000
Asia [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Revenues									937,615,000	953,838,000	1,575,682,000
Number of projects accounted under deferred profit recognition policy										4
Loss on contracts									34,300,000	34,300,000
Changes in project estimates									51,600,000	62,200,000
Number of project									7
Increase (decrease) in project estimated costs	-11,800,000				126,900,000				-11,800,000	126,900,000
Recovery of Direct Costs										14,700,000
Project charges											23,000,000
Asia [Member] | Project Two [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Increase (decrease) in project estimated costs	-10,300,000								-10,300,000
Project close-out savings									6,300,000
Partial offset on estimated costs on project									11,000,000
Asia [Member] | Australia [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Increase (decrease) in project estimated costs					-64,100,000					-64,100,000
Unconsolidated joint ventures [Member] | Middle East [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Revenues									0	0
Cost of operations									0	0
Consolidated Entities [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Cost of operations									0
Consolidated Entities [Member] | Middle East [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Revenues										11,700,000
Cost of operations										11,700,000
Claims Revenue [Member] | Middle East [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Revenues									6,500,000	17,200,000
Cost of operations									$6,500,000	$17,200,000

Recovered_Sheet2

Basis of Presentation and Significant Accounting Policies - Contract Receivables (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Accounts Notes And Loans Receivable [Line Items]
Retainages	$28,586,000	$127,698,000
Less allowances	0	0
Accounts receivable – trade, net	143,370,000	381,858,000
Contract receivables [Member]
Accounts Notes And Loans Receivable [Line Items]
Unbilled	4,303,000	14,571,000
Less allowances	-30,391,000	-30,404,000
Accounts receivable – trade, net	143,370,000	381,858,000
Contract receivables [Member] | Contracts in progress [Member]
Accounts Notes And Loans Receivable [Line Items]
Contracts receivable	106,174,000	192,745,000
Contract receivables [Member] | Completed contracts [Member]
Accounts Notes And Loans Receivable [Line Items]
Contracts receivable	$34,698,000	$77,248,000

Recovered_Sheet3

Basis of Presentation and Significant Accounting Policies - Retainages on Contracts (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Contractors [Abstract]
Retainages expected to be collected within one year	$28,586	$127,698
Retainages expected to be collected after one year	137,468	65,365
Total retainages	$166,054	$193,063

Basis_of_Presentation_and_Sign3

Basis of Presentation and Significant Accounting Policies - Summary of Accounts Receivable Other (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Receivables [Abstract]
Other taxes receivable	$31,392	$14,934
Receivables from unconsolidated affiliates	20,061	36,181
Accrued unbilled revenue	15,442	15,696
Intercompany unbilled cost	3,978	5,373
Employee receivables	4,336	4,532
Foreign currency forward contracts	1,173	11,641
Other	4,706	916
Accounts receivable-other	$81,088	$89,273

Basis_of_Presentation_and_Sign4

Basis of Presentation and Significant Accounting Policies - Components of Contracts in Progress and Advance Billings on Contracts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Contractors [Abstract]
Costs incurred less costs of revenue recognized	$90,191	$65,113
Revenues recognized less billings to customers	267,426	360,873
Contracts in Progress	357,617	425,986
Billings to customers less revenue recognized	578,896	466,205
Costs incurred less costs of revenue recognized	-379,031	-187,276
Advance Billings on Contracts	$199,865	$278,929

Basis_of_Presentation_and_Sign5

Basis of Presentation and Significant Accounting Policies - Summary of Changes in Carrying Amount of Other Non-Current Assets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other Noncurrent Assets [Abstract]
Balance	$14,951	$13,761
Debt issuance costs	47,737	4,905
Former Credit Agreement debt issuance cost write off	-11,913
Amortization of interest expense	-10,999	-3,715
Balance	39,776	14,951
Less: Current portion	-12,936
Noncurrent portion	$26,840	$14,951

Basis_of_Presentation_and_Sign6

Basis of Presentation and Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (Loss) included in Stockholders' Equity (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Statement Of Income And Comprehensive Income [Abstract]
Foreign currency translation adjustments	($15,212)	($2,562)
Net gain on investments	241	238
Net loss on derivative financial instruments	-82,837	-45,386
Accumulated other comprehensive loss	($97,808)	($47,710)	$6,053

Basis_of_Presentation_and_Sign7

Basis of Presentation and Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (Loss) Reclassified (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	($47,710)		$6,053
Other comprehensive income (loss) before reclassification	-74,750		-51,057
Amounts reclassified from AOCI	24,652	[1]	-2,706	[1]
Other comprehensive income (loss), net of tax	-50,098		-53,763
Ending Balance	-97,808		-47,710
Foreign currency translation gain (loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	-2,562		-3,366
Other comprehensive income (loss) before reclassification	-9,250		804
Amounts reclassified from AOCI	-3,400	[1]
Other comprehensive income (loss), net of tax	-12,650		804
Ending Balance	-15,212		-2,562
Unrealized holding gain (loss) on investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	238		-2,316
Other comprehensive income (loss) before reclassification	3		920
Amounts reclassified from AOCI			1,634	[1]
Other comprehensive income (loss), net of tax	3		2,554
Ending Balance	241		238
Deferred gain (loss) on derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	-45,386	[2]	11,735	[2]
Other comprehensive income (loss) before reclassification	-65,503	[2]	-52,781	[2]
Amounts reclassified from AOCI	28,052	[1],[2]	-4,340	[1],[2]
Other comprehensive income (loss), net of tax	-37,451	[2]	-57,121	[2]
Ending Balance	($82,837)	[2]	($45,386)	[2]
[1]	Reclassified to cost of operations and gain on foreign currency, net
[2]	Refer to Note 6 for additional details

Basis_of_Presentation_and_Sign8

Basis of Presentation and Significant Accounting Policies - Summary of Property Plant Equipment by Asset Category (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property Plant And Equipment [Line Items]
Property, Plant and Equipment	$2,473,563	$2,367,686
Accumulated Depreciation	-830,467	-889,009
Net Book Value	1,643,096	1,478,677	1,281,791
Marine Vessels [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment	1,241,105	1,089,121
Construction Equipment [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment	496,557	576,855
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment	435,447	408,705
Building [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment	159,623	161,407
All other [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment	$140,831	$131,598

Recovered_Sheet4

Acquisitions, Dispositions and Restructuring - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended		0 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Mar. 19, 2012	Jun. 30, 2014	Apr. 30, 2014	Jun. 30, 2014
		Vessel	JointVentures	Vessel
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Issuance of tangible equity units		$240,044,000
Number of joint ventures entered			2
Equity method investment recorded	25,500,000	21,000,000	25,500,000
Non controlling interest of equity method investment	20,900,000	20,900,000	20,900,000
Capital in excess of par value	4,600,000	3,100,000	4,600,000
Decrease in equity method investment		4,500,000
Number of vessels held for sale		4
Proceeds from sale of discontinued assets	32,000,000	24,500,000
Gain on sale of assets	12,500,000	11,100,000
Minimum [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Expected restructuring charges		25,000,000
Maximum [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Expected restructuring charges		30,000,000
Charter Fleet Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of vessels sold				10
Secunda International Limited [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of vessels				14
Morgan City Facility [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of discontinued assets					13,600,000
Gain on sale of assets					11,400,000
Texas [Member] | Harbor Island Facility [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of discontinued assets						31,700,000
Americas, Europe and Africa [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain on sale of assets					1,300,000
Americas, Europe and Africa [Member] | Harbor Island Facility [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain on sale of assets						25,000,000	25,100,000
Oceanteam ASA [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Percentage of interest acquired in subsidiary		50.00%
Purchase consideration - cash		32,900,000
Decrease in noncontrolling interest recorded		-44,000,000
Issuance of tangible equity units		11,100,000
Deepsea Group Limited [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Purchase consideration - cash			6,000,000
Total purchase consideration			9,000,000
Deepsea Group Limited [Member] | Restricted Shares [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Purchase consideration - restricted shares			313,580
THHE Fabricators Sdn. Bhd [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Percentage of interest acquired in subsidiary	30.00%		30.00%
Issuance of tangible equity units		($1,500,000)

Recovered_Sheet5

Acquisitions, Dispositions and Restructuring - Selected Financial Information Regarding Results of Operations of Charter Fleet Business (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain on disposal of discontinued operations, before taxes	$257
Total income from discontinued operations, net of tax	3,497
Charter Fleet Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Revenues	8,184
Gain on disposal of discontinued operations, before taxes	257
Income before provision for income taxes	3,240
Total	3,497
Total income from discontinued operations, net of tax	$3,497

Acquisitions_Dispositions_and_2

Acquisitions, Dispositions and Restructuring - Amounts Incurred and Amounts Expected to be Incurred in Future by Major Type of Cost and by Segment (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the year ended	$18,113	$35,727
Incurred from restructuring inception to December 31, 2014	53,840
Estimate of remaining amounts to be incurred	9,000
Total	62,840
Americas, Europe and Africa [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the year ended	9,170	34,066
Incurred from restructuring inception to December 31, 2014	43,236
Estimate of remaining amounts to be incurred	9,000
Total	52,236
Americas, Europe and Africa [Member] | Impairments And Write Offs
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the year ended	-1,240	14,163
Incurred from restructuring inception to December 31, 2014	12,923
Total	12,923
Americas, Europe and Africa [Member] | Severance and other personnel-related costs [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the year ended	3,735	9,645
Incurred from restructuring inception to December 31, 2014	13,380
Estimate of remaining amounts to be incurred	476
Total	13,856
Americas, Europe and Africa [Member] | Morgan City yard-related expenses [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the year ended	6,675	4,175
Incurred from restructuring inception to December 31, 2014	10,850
Estimate of remaining amounts to be incurred	5,252
Total	16,102
Americas, Europe and Africa [Member] | Other [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the year ended		158
Incurred from restructuring inception to December 31, 2014	158
Estimate of remaining amounts to be incurred	3,272
Total	3,430
Americas, Europe and Africa [Member] | Morgan City environmental reserve [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the year ended		5,925
Incurred from restructuring inception to December 31, 2014	5,925
Total	5,925
Corporate Segment
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the year ended	8,943	1,661
Incurred from restructuring inception to December 31, 2014	10,604
Total	10,604
Corporate Segment | Severance and other personnel-related costs [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the year ended	938	1,661
Incurred from restructuring inception to December 31, 2014	2,599
Total	2,599
Corporate Segment | Other [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the year ended	798
Incurred from restructuring inception to December 31, 2014	798
Total	798
Corporate Segment | Legal And Other Consulting Fees
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the year ended	7,207
Incurred from restructuring inception to December 31, 2014	7,207
Total	$7,207

Acquisitions_Dispositions_and_3

Acquisitions, Dispositions and Restructuring - Roll Forward of Accrued Liabilities Associated with Restructuring Activities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Restructuring Reserve [Line Items]
Beginning balance	$7,957
Accruals	2,809	12,850
Payments	-6,718	-4,893
Ending balance	4,048	7,957
Morgan City environmental reserve [Member]
Restructuring Reserve [Line Items]
Beginning balance	5,925
Accruals		5,925
Payments	-2,250
Ending balance	3,675	5,925
Severance and other personnel-related accruals [Member]
Restructuring Reserve [Line Items]
Beginning balance	927
Accruals	2,626	5,820
Payments	-3,553	-4,893
Ending balance		927
Morgan City yard-related expenses and Other [Member]
Restructuring Reserve [Line Items]
Beginning balance	1,105
Accruals	183	1,105
Payments	-915
Ending balance	$373	$1,105

Recovered_Sheet6

Long-Term Debt and Notes Payable - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended	6 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2014	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Letter of credit, first lien	$950
Senior Notes [Member]
Debt Instrument [Line Items]
Issue of second-lien seven-year senior secured notes	500	500
Tangible equity units, aggregate principal amount	47.5	40.5
Unsecured bilateral letters of credit [Member]
Debt Instrument [Line Items]
Letter of credit outstanding borrowings				96.9
Letter of Credit Facility [Member]
Debt Instrument [Line Items]
Letter of credit, first lien	400
Line of credit aggregate borrowing capacity		100
Term Loan [Member]
Debt Instrument [Line Items]
Letter of credit, first lien	300
Tangible Equity Units [Member]
Debt Instrument [Line Items]
Issue of tangible equity units	287.5
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized issuance fees recognized as expenses			28
Line of credit aggregate borrowing capacity		950
Letter of credit outstanding borrowings		$214.30

Recovered_Sheet7

Long-Term Debt and Notes Payable - Additional Information 1 (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Debt Instrument [Line Items]
Aggregate amount financial letters of credit	25.00%
Line of Credit facility maximum amount outstanding	$195,800,000
Letter of credit facility covenant terms	The LC Facility requires us to generate consolidated earnings before interest, taxes, depreciation and amortization (“EBITDA”) of at least specified minimum amounts over the term of the facility. The LC Facility also requires us to maintain a ratio of fair market value of vessel collateral to the sum of (1) the outstanding principal amount of the Term Loan, (2) the aggregate amount of undrawn financial letters of credit outstanding under the LC Facility, (3) all drawn but unreimbursed letters of credit under the LC Facility, and (4) mark-to-market foreign exchange exposure that is not cash secured of at least 1.20:1.00. The LC Facility also specifies maximum capital expenditures over the term of the facility and requires us to maintain at least $200.0 million of minimum available cash, at the end of each quarter.
Minimum required cash balance as per letter of credit agreement	200,000,000
Mark-to-market foreign exchange exposure ratio	1.2
Outstanding borrowings, Term loan	298,500,000
Current notes payable	15,300,000
Excess cash flow	50.00%
Term Loan amortization amount	750,000
Date of repay to provide a prepayment premium	16-Apr-15
Aggregate principal amount of unreimbursed drawings and advances under line of credit facility	1.75
Original issue discount	25 basis points
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Base rate and applicable margin	4.25%
Maximum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Base rate and applicable margin	3.25%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Base rate and applicable margin	1.00%
Minimum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Base rate and applicable margin	2.00%
Letter of Credit Facility [Member]
Debt Instrument [Line Items]
Uncommitted increases in letter of credit capacity	400,000,000
Additional uncommitted increases in letter of credit capacity	100,000,000
Total capacity that letter of credit can be increased	100,000,000
Cash collateralize letter of credit permitted to deposit, Amount	300,000,000
Letter of credit supported by Cash collateral	88,800,000
Commitment fee on the unused portion of credit agreement	0.50%
Performance Letters of Credit [Member]
Debt Instrument [Line Items]
Letter of credit fee	4.50%
Term Loan [Member]
Debt Instrument [Line Items]
Current notes payable	3,000,000
Term Loan [Member] | Maximum [Member]
Debt Instrument [Line Items]
Reinvestment period	365 days
Financial Letter of Credit [Member]
Debt Instrument [Line Items]
Line of Credit facility maximum amount outstanding	0
Letter of credit supported by Cash collateral	$19,700,000
Letter of credit fee	2.25%

LongTerm_Debt_and_Notes_Payabl2

Long-Term Debt and Notes Payable - Additional Information 2 (Detail) (USD $)	12 Months Ended	1 Months Ended	9 Months Ended
	Dec. 31, 2014	Apr. 30, 2014	Sep. 30, 2010	Dec. 31, 2013	Apr. 20, 2012
Debt Instrument [Line Items]
Debt instrument maturity date	1-Apr-17
Units issued	11,500,000
Tangible units interest rate percentage	6.25%
Unit price per share	25
Initial principal amount per amortizing note	4.1266
Amortizing note interest rate percentage	7.75%
Issuance of tangible equity units	$240,044,000
Current notes payable	15,300,000
Maximum settlement rate per tangible equity unit	$3.56
Dilutive common shares issuable under common stock purchase contracts	40,900,000
Principal repayment	16-Apr-15
Equity method investment recorded	21,000,000			25,500,000
Mexico [Member]
Debt Instrument [Line Items]
Bonds issued related to JRMSA general agreement of indemnity	52,500,000			43,500,000
Brazil [Member]
Debt Instrument [Line Items]
Bonds issued related to JRMSA general agreement of indemnity	0			106,300,000
Reimbursement Agreement
Debt Instrument [Line Items]
Bank guarantees issued	56,200,000			55,800,000
Letters of credit outstanding	0			39,800,000
Servicer Advance Reimbursement Agreement
Debt Instrument [Line Items]
Letters of credit outstanding					109,000,000
North Ocean Construction Financing [Member] | North Ocean 102 [Member]
Debt Instrument [Line Items]
Current notes payable				31,400,000
Percentage of debt guaranteed by JRMSA	50.00%
Debt description	The outstanding debt bore interest at a rate equal to the three-month LIBOR (which was subject to reset every three months) plus a margin of 3.315%.
Applicable margin for LIBOR borrowing	3.32%
Debt maturity date	2014-01
Ownership percentage in Oceanteam ASA's	50.00%
Equity method investment recorded	32,900,000
Minimum [Member]
Debt Instrument [Line Items]
Dilutive common shares issuable under common stock purchase contracts	33,400,000
Dilutive common shares issuable under common stock purchase contracts, per unit	$2.90
Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt issued	500,000,000	500,000,000
Debt instrument interest rate	8.00%
Debt instrument maturity date	1-May-21
Tangible equity units, aggregate principal amount	40,500,000	47,500,000
Secured Debt [Member] | North Ocean Construction Financing [Member] | North Ocean 105 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate			2.76%
Current notes payable	8,200,000			8,200,000
Percentage of interest acquired in subsidiary	75.00%
Principal repayment	The agreement provides for borrowings of up to $69.4 million, bearing interest at 2.76% per year, and requires principal repayment in 17 consecutive semi-annual installments, which commenced on October 1, 2012.
Number of consecutive semi-annual installments	17
Borrowing outstanding	49,000,000			57,200,000
Secured Debt [Member] | Maximum [Member] | North Ocean Construction Financing [Member] | North Ocean 105 [Member]
Debt Instrument [Line Items]
Secured debt	$69,400,000

LongTerm_Debt_and_Notes_Payabl3

Long-Term Debt and Notes Payable - Summary of Redemption Prices Expressed as Percentage (Detail)	12 Months Ended
	Dec. 31, 2014
2017 [Member]
Debt Instrument Redemption [Line Items]
Redemption prices expressed as percentage	104.00%
2018 [Member]
Debt Instrument Redemption [Line Items]
Redemption prices expressed as percentage	102.00%
2019 and thereafter [Member]
Debt Instrument Redemption [Line Items]
Redemption prices expressed as percentage	100.00%

LongTerm_Debt_and_Notes_Payabl4

Long-Term Debt and Notes Payable - Summary of Long-Term Debt Obligations (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Long-term debt consists of:
Long-term borrowing	$891,547	$88,562
Less: Amounts due within one year	27,026	39,543
Total long-term debt	864,521	49,019
Senior Notes [Member]
Long-term debt consists of:
Long-term borrowing	500,000
Term Loan [Member]
Long-term debt consists of:
Long-term borrowing	298,500
Amortizing Notes [Member]
Long-term debt consists of:
Long-term borrowing	40,483
Capital lease obligation [Member]
Long-term debt consists of:
Long-term borrowing	2,802
Other financing [Member]
Long-term debt consists of:
Long-term borrowing	743
North Ocean 105 [Member]
Long-term debt consists of:
Long-term borrowing	49,019	57,189
North Ocean 102 [Member]
Long-term debt consists of:
Long-term borrowing		$31,373

LongTerm_Debt_and_Notes_Payabl5

Long-Term Debt and Notes Payable - Maturities of Long-Term Debt During Five Years (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
2015	$27,026
2016	28,274
2017	20,558
2018	11,616
2019	295,903
Thereafter	508,170
Total	$891,547	$88,562

Recovered_Sheet8

Pension Plans and Postretirement Benefits - Obligations and Funded Status (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in plan assets:
Fair value of plan assets at end of year	$593,927	$611,284
Amounts recognized in balance sheet consist of:
Pension liability	-18,403	-15,681
Domestic Plans [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	583,421	615,361
Interest cost	26,972	23,996	26,521
Actuarial loss (gain)	36,885	-25,137
Terminated Vested Employees Lump Sum Settlement	-54,551
Curtailments and other adjustments		3,850
Benefits paid	-36,095	-34,649
Benefit obligation at end of year	556,632	583,421	615,361
Change in plan assets:
Fair value of plan assets at beginning of year	567,801	605,892
Actual return on plan assets	73,114	-4,982
Company contributions	1,552	1,540
Terminated Vested Employees Lump Sum Settlement	-54,551
Benefits paid	-36,095	-34,649
Fair value of plan assets at end of year	551,821	567,801	605,892
Funded status	-4,811	-15,620
Amounts recognized in balance sheet consist of:
Other Assets	12,685	598
Accrued pension liability—current	-1,519	-1,519
Pension liability	-15,977	-14,699
Accrued benefit liability	-17,496	-16,218
Net (Liability)/ Asset	-4,811	-15,620
Plans with accumulated benefit obligation in excess of plan assets
Projected benefit obligation	556,632	583,421
Accumulated benefit obligation	556,632	583,421
Fair value of plan assets	551,821	567,801
TCN Plan [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	40,396	48,009
Interest cost	1,900	1,867	1,843
Actuarial loss (gain)	4,438	-5,860
Curtailments and other adjustments		-621
Benefits paid	-2,749	-2,999
Benefit obligation at end of year	43,985	40,396	48,009
Change in plan assets:
Fair value of plan assets at beginning of year	43,483	39,039
Actual return on plan assets	1,372	6,943
Company contributions		500
Benefits paid	-2,749	-2,999
Fair value of plan assets at end of year	42,106	43,483	39,039
Funded status	-1,879	3,087
Amounts recognized in balance sheet consist of:
Other Assets		3,087
Pension liability	-1,879
Accrued benefit liability	-1,879
Net (Liability)/ Asset	-1,879	3,087
Plans with accumulated benefit obligation in excess of plan assets
Projected benefit obligation	43,985	40,396
Accumulated benefit obligation	43,985	40,396
Fair value of plan assets	$42,106	$43,483

Recovered_Sheet9

Pension Plans and Postretirement Benefits - Obligations and Funded Status (Parenthetical) (Detail) (Domestic Plans [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Lump sum settlement to employees resulted in decrease in plan assets	$54,551

Pension_Plans_and_Postretireme2

Pension Plans and Postretirement Benefits - Weighted Average Assumptions used to Determine Net Periodic Benefit Obligations and Net Periodic Benefit Cost (Detail)	Dec. 31, 2014	Dec. 31, 2013
Domestic Plans [Member]
Weighted average assumptions used to determine net periodic benefit obligations at December 31:
Discount rate	4.00%	4.80%
TCN Plan [Member]
Weighted average assumptions used to determine net periodic benefit obligations at December 31:
Discount rate	3.80%	4.80%

Pension_Plans_and_Postretireme3

Pension Plans and Postretirement Benefits - Net Periodic Benefit Cost (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$26,972	$23,996	$26,521
Expected return on plan assets	-27,501	-38,306	-35,809
Current period (gain) loss	-8,728	22,002	19,580
Net periodic benefit (gain) cost	-9,257	7,692	10,292
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31:
Discount rate	4.80%	4.00%	4.80%
Expected return on plan assets	5.00%	6.50%	6.50%
TCN Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1,900	1,867	1,843
Expected return on plan assets	-2,961	-2,602	-2,443
Current period (gain) loss	6,027	-10,822	3,998
Net periodic benefit (gain) cost	$4,966	($11,557)	$3,398
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31:
Discount rate	4.80%	4.00%	4.80%
Expected return on plan assets	6.90%	6.90%	6.90%

Pension_Plans_and_Postretireme4

Pension Plans and Postretirement Benefits - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on plan assets	5.00%
Employer contributions, percentage match of participants' contributions	50.00%
Employer contributions, percentage unmatched of participants' contributions	3.00%
Defined contribution plans costs	$3.90	$6.40	$6.80
Domestic Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan matching percent of compensation	6.00%
TCN Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on plan assets	6.90%
Employer contributions, percentage match of participants' contributions	50.00%
Employer contributions, percentage unmatched of participants' contributions	3.00%
Defined contribution plans costs	$1.20	$1.60	$1.60
TCN Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan matching percent of compensation	6.00%

Pension_Plans_and_Postretireme5

Pension Plans and Postretirement Benefits - Asset Allocations by Asset Category (Detail)	Dec. 31, 2014	Dec. 31, 2013
Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations, by asset category	100.00%	100.00%
TCN Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations, by asset category	100.00%	100.00%
Fixed Income [Member] | Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations, by asset category	85.00%	85.00%
Fixed Income [Member] | TCN Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations, by asset category	28.00%	25.00%
Equity Securities [Member] | Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations, by asset category	15.00%	15.00%
Equity Securities [Member] | TCN Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations, by asset category	72.00%	75.00%

Pension_Plans_and_Postretireme6

Pension Plans and Postretirement Benefits - Total Investments Plans Measured at Fair Value (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$593,927	$611,284
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	186,312	102,329
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	402,602	505,186
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,013	3,769
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	471,704	479,529
Fixed Income [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	64,575	58,556
Fixed Income [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	402,116	417,204
Fixed Income [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,013	3,769	1,576
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	110,267	119,669
Equity Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	109,781	31,687
Equity Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	486	87,982
Cash and Accrued Items [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,956	12,086
Cash and Accrued Items [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$11,956	$12,086

Pension_Plans_and_Postretireme7

Pension Plans and Postretirement Benefits - Changes in Level Three Fixed Income Instrument Measured on Recurring Basis (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at end of year	$593,927	$611,284
Fixed Income [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at end of year	471,704	479,529
Level 3 [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at end of year	5,013	3,769
Level 3 [Member] | Fixed Income [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of plan assets at beginning of year	3,769	1,576
Purchases, net	1,347	2,120
Total unrealized gains (loss)	-103	73
Fair value of plan assets at end of year	$5,013	$3,769

Pension_Plans_and_Postretireme8

Pension Plans and Postretirement Benefits - Expected Employer Contributions to Trusts of Defined Benefit Plans (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Domestic Plans [Member]
Expected benefit payments:
2015	$37,344
2016	37,288
2017	37,060
2018	36,887
2019	36,633
2020-2024	178,455
TCN Plan [Member]
Expected benefit payments:
2015	2,379
2016	2,799
2017	2,690
2018	2,498
2019	2,604
2020-2024	$11,540

Investments_Additional_Informa

Investments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]
Available-for-sale securities	$3,915,000	$13,511,000
Asset-backed and mortgage-backed securities impairment		1,600,000
Net unrealized gain loss on investments	$200,000	$200,000

Investments_AvailableForSale_S

Investments - Available-For-Sale Securities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$3,674	$13,273
Gross Unrealized Gains	241	238
Estimated Fair Value	3,915	13,511
Mutual funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,975	1,975
Gross Unrealized Gains	241	198
Estimated Fair Value	2,216	2,173
Commercial paper [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,699	3,699
Estimated Fair Value	1,699	3,699
Asset-backed securities and collateralized mortgage obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		7,599
Gross Unrealized Gains		40
Estimated Fair Value		$7,639

Investments_AvailableForSale_S1

Investments - Available-For-Sale Securities (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Available For Sale Securities [Line Items]
Asset-backed and mortgage-backed securities impairment		1.6
Asset-backed securities and collateralized mortgage obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Commercial paper secured by mortgaged-backed securities		5.6
Maximum [Member] | Commercial paper [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, maturities	1 year	1 year
Maximum [Member] | Asset-backed securities and collateralized mortgage obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, maturities		26 years

Investments_Proceeds_Gross_Rea

Investments - Proceeds, Gross Realized Gains and Gross Realized Losses From Sales and Maturities Available-For-Sale Securities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Available For Sale Securities [Abstract]
Proceeds	$12,978	$43,959	$191,298
Gross Realized Losses	($326)

Recovered_Sheet10

Derivative Financial Instruments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Net gain (loss) on derivative financial instruments	($82,837,000)	($45,386,000)
Net deferred losses expected to be reclassified from AOCI over next 12 months	-61,900,000
Derivative contracts, maturity date	31-Oct-17
Fair value of derivative contracts	46,900,000
Foreign Exchange Forward
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Notional value of outstanding derivative contracts	844,300,000
EPCI projects [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Notional value of outstanding derivative contracts	$534,400,000

Recovered_Sheet11

Derivative Financial Instruments - Derivative Financial Instruments (Detail) (Designated as Hedging Instrument, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative [Line Items]
Asset derivatives fair value	$1,189	$13,288
Liability derivatives fair value	48,101	42,055
Accounts receivable-other [Member]
Derivative [Line Items]
Asset derivatives fair value	1,173	11,641
Accounts payable [Member]
Derivative [Line Items]
Liability derivatives fair value	32,431	20,209
Other assets [Member]
Derivative [Line Items]
Asset derivatives fair value	16	1,647
Other liabilities [Member]
Derivative [Line Items]
Liability derivatives fair value	$15,670	$21,846

Derivative_Financial_Instrumen2

Derivative Financial Instruments - Effects of Derivative Instruments on Financial Statements (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of gain/(loss) recognized in AOCI	($65,503)	($52,781)
Cost of operations [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Income (loss) reclassified from AOCI into income: effective portion	26,418	1,715
Gain (loss) on foreign currency-net [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Gain(loss) recognized in income (loss): ineffective portion and amount excluded from effectiveness testing	$6,910	$13,247

Recovered_Sheet12

Fair Values of Financial Instruments - Additional Information (Detail) (USD $)	Dec. 31, 2014
Fair Value Measurements [Line Items]
Fair value of derivative contracts	$46,900,000
Foreign Exchange Forward
Fair Value Measurements [Line Items]
Notional value of outstanding derivative contracts	$844,300,000

Recovered_Sheet13

Fair Values of Financial Instruments - Available-for-Sale Securities Measured at Fair Value (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities	$3,915	$13,511
Level 2 [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities	3,915	7,954
Level 3 [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities		5,557
Mutual funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities	2,216	2,173
Mutual funds [Member] | Level 2 [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities	2,216	2,173
Commercial paper [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities	1,699	3,699
Commercial paper [Member] | Level 2 [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities	1,699	3,699
Asset-backed securities and collateralized mortgage obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities		7,639
Asset-backed securities and collateralized mortgage obligations [Member] | Level 2 [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities		2,082
Asset-backed securities and collateralized mortgage obligations [Member] | Level 3 [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities		$5,557

Fair_Values_of_Financial_Instr2

Fair Values of Financial Instruments - Available-for-Sale Securities Measured at Fair Value (Parenthetical) (Detail) (Asset-backed securities and collateralized mortgage obligations [Member])	12 Months Ended
	Dec. 31, 2013
Asset-backed securities and collateralized mortgage obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Asset-backed and mortgage-backed securities with maturities	26 years

Fair_Values_of_Financial_Instr3

Fair Values of Financial Instruments - Changes in Level Three Instrument Measured on Recurring Basis (Detail) (Level 3 [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Level 3 [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$5,557	$6,343
Total realized and unrealized gains (losses)	-375	484
Sales and principal repayments	-5,182	-1,270
Balance at end of period		$5,557

Fair_Values_of_Financial_Instr4

Fair Values of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	$665,309	$118,702
Restricted cash and cash equivalents	187,585	23,652
Investments	3,915	13,511
Debt	-891,547	-88,562
Forward contracts	-46,912	-28,767
Fair value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	665,309	118,702
Restricted cash and cash equivalents	187,585	23,652
Investments	3,915	13,511
Debt	-737,980	-90,005
Forward contracts	($46,912)	($28,767)

Stockbased_Compensation_Total_

Stock-based Compensation - Total Stock-Based Compensation Expense Recognized (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expenses	$16,516	$21,100	$15,369
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expenses	1,747	4,321	3,984
Restricted Stock and Restricted Stock units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expenses	14,417	12,326	6,880
Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expenses	$352	$4,453	$4,505

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 11, 2002	31-May-14	Nov. 12, 1991
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation charges	$18,565,000	$21,100,000	$15,369,000
Unrecognized estimated compensation expense for nonvested awards	26,800,000
Tax benefits realized related to stock options exercised	0	0	0
Tax benefits realized related to restricted stock and restricted stock units	0	0
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized estimated compensation expense for nonvested awards	1,457,000
Common stock dividend yield	0.00%
Total intrinsic value of stock options exercised	900,000	500,000	1,900,000
Cash received from exercise of stock options	600,000	300,000	1,400,000
Weighted-average fair value of stock options granted		$4.78	$6.93
Fair value of shares vested	4,400,000	3,700,000	3,600,000
2014 McDermott International, Inc. Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized for issuance					6,600,000
2009 McDermott International, Inc. Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized for issuance	9,000,000
Options to purchase shares, maximum expiration term	7 years
2001 Directors and Officers Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options to purchase shares, maximum expiration term	10 years
Percentage of fair market value that options to purchase are granted, minimum	100.00%
Thrift Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized for issuance						15,000,000
Additional shares authorized for issuance				15,000,000
Matching employer contributions percentage of the first 6% of compensation	50.00%
Defined contribution plan matching percent of compensation	6.00%
Common stock issued	0	0	0
Severance and Related Restructuring Costs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation charges	$2,000,000

Recovered_Sheet14

Stock-Based Compensation - Total Gross Unrecognized Estimated Compensation Expense and Expected Weighted-Average Periods (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized estimated compensation expense for nonvested awards	$26,800
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized estimated compensation expense for nonvested awards	1,457
Weighted-average period for expense recognition	1 year 1 month 6 days
Restricted Stock and Restricted Stock units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized estimated compensation expense for nonvested awards	21,164
Weighted-average period for expense recognition	2 years 1 month 6 days
Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized estimated compensation expense for nonvested awards	$4,140
Weighted-average period for expense recognition	1 year 10 months 24 days

StockBased_Compensation_Weight

Stock-Based Compensation - Weighted Average Assumptions (Detail) (Stock Options [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate		0.68%	0.77%
Expected volatility		56.00%	59.00%
Expected life of the option in years	0 years	4 years 7 months 6 days	4 years 7 months 6 days
Expected dividend yield		0.00%	0.00%

StockBased_Compensation_Activi

Stock-Based Compensation - Activity for Stock Option (Detail) (Stock Options [Member], USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Option Shares, Outstanding at beginning of period	3,762,000
Number of Option Shares, Exercised	-169,000
Number of Option Shares, Cancelled/expired/forfeited	-300,000
Number of Option Shares, Outstanding at end of period	3,293,000
Number of Option Shares, Exercisable at end of period	2,521,000
Weighted-Average Exercise Price, Outstanding at beginning of period	$11.78
Weighted-Average Exercise Price, Exercised	$2.14
Weighted-Average Exercise Price, Cancelled/expired/forfeited	$12.75
Weighted-Average Exercise Price, Outstanding at end of period	$12.18
Weighted-Average Exercise Price, Exercisable at end of period	$12.47
Weighted-Average Remaining Contractual Term, Outstanding at end of period	3 years 3 months 18 days
Weighted-Average Remaining Contractual Term, Exercisable at end of period	2 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding	$0
Aggregate Intrinsic Value, Exercisable	$0

StockBased_Compensation_Activi1

Stock-Based Compensation - Activity for Stock Option (Parenthetical) (Detail) (Stock Options [Member], USD $)	Dec. 31, 2014
In Millions, except Per Share data, unless otherwise specified
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options expected to vest, shares	0.7
Stock options expected to vest, weighted-average exercise price	$11.27

StockBased_Compensation_Nonves

Stock-Based Compensation - Nonvested Restricted Stock, Restricted Stock Units and Changes (Detail) (Restricted Stock and Restricted Stock units [Member], USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
Restricted Stock and Restricted Stock units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Nonvested at beginning of period	3,767
Number of Shares, Granted	2,536
Number of Shares, Vested	-1,097
Number of Shares, Cancelled/forfeited	-558
Number of Shares, Nonvested at end of period	4,648
Weighted-Average Grant Date Fair Value, Nonvested at beginning of period	$9.18
Weighted-Average Grant Date Fair Value, Granted	$7.56
Weighted-Average Grant Date Fair Value, Vested	$10.69
Weighted-Average Grant Date Fair Value, Cancelled/forfeited	$8.66
Weighted-Average Grant Date Fair Value, Nonvested at end of period	$8

StockBased_Compensation_Nonves1

Stock-Based Compensation - Nonvested Performance Shares and Performance Unit Awards and Changes (Detail) (Performance Shares [Member], USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Nonvested at beginning of period	1,168
Number of Shares, Granted	626
Number of Shares, Cancelled/forfeited	-342
Number of Shares, Nonvested at end of period	1,452
Weighted-Average Grant Date Fair Value, Nonvested at beginning of period	$13.70
Weighted-Average Grant Date Fair Value, Granted	$7.76
Weighted-Average Grant Date Fair Value, Cancelled/forfeited	$11.97
Weighted-Average Grant Date Fair Value, Nonvested at end of period	$11.55

Income_Taxes_Provision_for_Inc

Income Taxes - Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other than U.S.:
Current	$21,619	$54,410	$125,402
Deferred	-1,546	-5,359	3,802
Total provision for income taxes	$20,073	$49,051	$129,204

Income_Taxes_Geographic_Source

Income Taxes - Geographic Source of Income Before Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
U.S.	($31,124)	($151,904)	($92,025)
Other than U.S.	-14,197	-288,955	422,967
Income (loss) from continuing operations before provision for income taxes, discontinued operations and noncontrolling interests	($45,321)	($440,859)	$330,942

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Panama Statutory Federal Tax Rate to Consolidated Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Panama federal statutory rate	25.00%	25.00%	25.00%
Non-Panama operations	3.50%	-16.40%	-4.40%
Valuation allowance for deferred tax assets	-86.60%	-19.10%	14.70%
Audit settlements and reserves	14.20%	-0.90%	3.00%
Other	-0.40%	0.30%	0.70%
Effective tax rate attributable to continuing operations	-44.30%	-11.10%	39.00%

Income_Taxes_Significant_Compo

Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Pension liability	$10,976	$16,658
Accrued liabilities for incentive compensation	19,015	15,032
Net operating loss carryforward	294,722	259,600
State net operating loss carryforward	21,296	24,679
Long-term contracts	39,817	13,504
Other	1,549	4,936
Total deferred tax assets	387,375	334,409
Valuation allowance for deferred tax assets	-331,589	-292,388
Deferred tax assets	55,786	42,021
Deferred tax liabilities:
Property, plant and equipment	28,815	19,115
Prepaid drydock	10,280	13,025
Investments in joint ventures and affiliated companies	13,583	8,354
Unrealized exchange gains and other	3,162	3,236
Total deferred tax liabilities	55,840	43,730
Net deferred tax liability	54	1,709
Deferred tax assets and liabilities in the accompanying consolidated balance sheets include:
Current deferred tax assets	7,514	7,091
Noncurrent deferred tax assets	17,313	16,766
Total	24,827	23,857
Current deferred tax liabilities	19,753	17,892
Noncurrent deferred tax liabilities	5,128	7,674
Total	24,881	25,566
Net deferred tax liability	$54	$1,709

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Valuation allowance for deferred tax assets	$331,589,000	$292,388,000
Foreign net operating loss carryforwards	538,300,000
U.S federal net operating loss carryforwards	459,700,000
State net operating loss carryforward	21,296,000	24,679,000
Taxes on earnings	13,000,000
Undistributed earnings of subsidiaries	136,800,000
Unrecognized deferred income tax liabilities	300,000
Liabilities recorded for payment of tax-related interest and penalties	15,100,000	15,400,000	15,300,000
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, valuation allowance	127,000,000
Foreign Country [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, expiration year	2015
Foreign Country [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, expiration year	2017
Domestic Country [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, valuation allowance	160,900,000
Domestic Country [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, expiration year	2023
Domestic Country [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, expiration year	2034
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance for deferred tax assets	28,100,000
Net operating loss carryforwards, valuation allowance	21,300,000
State net operating loss carryforward	409,500,000
State and Local Jurisdiction [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, expiration year	2015
State and Local Jurisdiction [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, expiration year	2028
Additional Paid-in Capital [Member]
Operating Loss Carryforwards [Line Items]
U.S federal net operating loss carryforwards	16,200,000
Expire in the years 2015 to 2017 [Member]
Operating Loss Carryforwards [Line Items]
Foreign net operating loss carryforwards	$9,000,000

Income_Taxes_Reconciliation_of1

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance at beginning of period	$40,613	$40,516	$31,664
Increases based on tax positions taken in the current year	3,479	539	10,830
Increases based on tax positions taken in prior years	3,195	3,831	158
Decreases based on tax positions taken in prior years	-863	-3,688	-1,465
Decreases due to lapse of applicable statute of limitation	-12,318	-585	-671
Balance at end of period	$34,106	$40,613	$40,516

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Antidilutive securities excluded from earnings per share computation, shares	3,100,000	3,200,000	1,800,000
Antidilutive securities excluded from diluted weighted average shares computation, shares	30,700,000		1,981,266

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Income (loss) from continuing operations less noncontrolling interest									($75,994)	($508,868)	$190,968
Income from discontinued operations, net of tax											3,497
Net income (loss) attributable to McDermott International, Inc.	$8,175	($30,252)	($7,397)	($46,520)	($326,236)	($60,632)	($146,208)	$24,208	($75,994)	($508,868)	$194,465
Weighted average common shares (basic)									237,229,086	236,514,584	235,638,422
Effect of dilutive securities:
Stock options, restricted stock and restricted stock units									30,700,000		1,981,266
Adjusted weighted average common shares and assumed exercises of stock options and vesting of stock awards (diluted)									237,229,086	236,514,584	237,619,688
Basic earnings (loss) per share
Income (loss) from continuing operations less noncontrolling interest	$0.03	($0.13)	($0.03)	($0.20)	($1.38)	($0.26)	($0.62)	$0.10	($0.32)	($2.15)	$0.81
Income (loss) from discontinued operations, net of tax											$0.01
Net income (loss) attributable to McDermott International, Inc.	$0.03	($0.13)	($0.03)	($0.20)	($1.38)	($0.26)	($0.62)	$0.10	($0.32)	($2.15)	$0.83
Diluted earnings (loss) per share:
Income (loss) from continuing operations less noncontrolling interest	$0.03	($0.13)	($0.03)	($0.20)	($1.38)	($0.26)	($0.62)	$0.10	($0.32)	($2.15)	$0.80
Income (loss) from discontinued operations, net of tax											$0.01
Net income (loss) attributable to McDermott International, Inc.	$0.03	($0.13)	($0.03)	($0.20)	($1.38)	($0.26)	($0.62)	$0.10	($0.32)	($2.15)	$0.82

Segment_Reporting_Additional_I

Segment Reporting - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	Segment
Segment Reporting [Abstract]
Number of reporting segments	3
Receivables from unconsolidated affiliates	$20,061	$36,181

Segment_Reporting_Information_

Segment Reporting - Information about Operations in Different Segments (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$806,400,000	$414,595,000	$476,083,000	$603,811,000	$517,338,000	$686,856,000	$647,250,000	$807,488,000	$2,300,889,000	$2,658,932,000	$3,641,624,000
Operating income (loss)	25,949,000	-10,711,000	31,525,000	-38,209,000	-317,896,000	-49,216,000	-146,321,000	56,688,000	8,554,000	-456,745,000	307,139,000
Capital expenditures									321,187,000	283,962,000	286,310,000
Depreciation and amortization									93,185,000	84,580,000	86,440,000
Drydock amortization									19,719,000	18,467,000	25,545,000
Asia [Member]
Segment Reporting Information [Line Items]
Revenues									937,615,000	953,838,000	1,575,682,000
Operating income (loss)									55,412,000	-72,159,000	236,874,000
Capital expenditures									154,735,000	117,060,000	219,920,000
Depreciation and amortization									19,020,000	18,693,000	23,797,000
Drydock amortization									6,255,000	8,917,000	9,487,000
Middle East [Member]
Segment Reporting Information [Line Items]
Revenues									795,666,000	1,167,804,000	1,591,881,000
Operating income (loss)									11,421,000	-169,224,000	138,733,000
Capital expenditures									99,974,000	127,498,000	29,736,000
Depreciation and amortization									31,876,000	31,699,000	31,119,000
Drydock amortization									2,011,000	2,133,000	2,489,000
Americas, Europe and Africa [Member]
Segment Reporting Information [Line Items]
Revenues									567,608,000	537,290,000	474,061,000
Operating income (loss)									-49,337,000	-215,362,000	-68,468,000
Capital expenditures									53,431,000	22,177,000	32,699,000
Depreciation and amortization									34,494,000	26,788,000	24,589,000
Drydock amortization									11,453,000	7,417,000	13,569,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating income (loss)									-8,942,000
Capital expenditures									13,047,000	17,227,000	3,955,000
Depreciation and amortization									$7,795,000	$7,400,000	$6,935,000

Segment_Reporting_Information_1

Segment Reporting - Information about Operations in Different Segments (Parenthetical) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting [Abstract]
Accrued capital expenditures		$48,300,000	$0
Cash payments for accrued capital expenditures outstanding	$27,000,000

Segment_Reporting_Significant_

Segment Reporting - Significant Impact of Customers on Company Segments (Detail) (Sales Revenue, Net [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Middle East [Member] | Saudi Aramco [Member]
Segment Reporting Information [Line Items]
Percentage of consolidated revenues	27.00%	25.00%	22.00%
Middle East [Member] | Azerbaijan International Oil Company [Member]
Segment Reporting Information [Line Items]
Percentage of consolidated revenues		13.00%
Asia [Member] | Inpex Operations Australia Pty Ltd [Member]
Segment Reporting Information [Line Items]
Percentage of consolidated revenues	25.00%
Asia [Member] | Exxon Mobil Corporation [Member]
Segment Reporting Information [Line Items]
Percentage of consolidated revenues			24.00%
Asia [Member] | BHP Billiton Petroleum Pty Ltd [Member]
Segment Reporting Information [Line Items]
Percentage of consolidated revenues			10.00%

Segment_Reporting_Information_2

Segment Reporting - Information about Service Lines and Operations in Different Geographic Areas (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	$806,400,000	$414,595,000	$476,083,000	$603,811,000	$517,338,000	$686,856,000	$647,250,000	$807,488,000	$2,300,889,000	$2,658,932,000	$3,641,624,000
Offshore Operations [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									1,041,525,000	1,155,516,000	1,885,143,000
Fabrication Operations [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									266,854,000	370,854,000	487,215,000
Project Services and Engineering Operations [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									314,776,000	341,084,000	337,774,000
Procurement Activities [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									677,734,000	791,478,000	931,492,000
Saudi Arabia [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									616,659,000	720,879,000	1,057,930,000
Australia [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									614,164,000	481,123,000	1,485,503,000
Brazil [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									290,561,000	176,475,000	87,597,000
Indonesia [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									150,205,000	144,538,000
United States [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									148,606,000	126,986,000	119,785,000
Mexico [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									130,642,000	117,813,000	55,974,000
Azerbaijan [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									111,382,000	345,742,000	268,419,000
Malaysia [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									98,004,000	329,689,000	67,553,000
United Arab Emirates [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									57,249,000	19,528,000	156,395,000
Other countries [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									$83,417,000	$196,159,000	$342,468,000

Segment_Reporting_Information_3

Segment Reporting - Information about Segment Assets and Property, Plant and Equipment by Country (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Segment Reporting Information [Line Items]
Total Assets	$3,443,957	$2,807,371	$3,333,627
Net Property, Plant and Equipment	1,643,096	1,478,677	1,281,791
Asia [Member]
Segment Reporting Information [Line Items]
Assets, continuing operations	601,394	1,030,823	1,402,923
Middle East [Member]
Segment Reporting Information [Line Items]
Assets, continuing operations	990,671	1,116,916	1,006,284
Americas, Europe and Africa [Member]
Segment Reporting Information [Line Items]
Assets, continuing operations	979,310	535,326	536,734
Brazil [Member]
Segment Reporting Information [Line Items]
Net Property, Plant and Equipment	458,199	192,101	52,955
United Arab Emirates [Member]
Segment Reporting Information [Line Items]
Net Property, Plant and Equipment	306,320	145,635	110,292
Mexico [Member]
Segment Reporting Information [Line Items]
Net Property, Plant and Equipment	245,226	96,830	61,390
Singapore [Member]
Segment Reporting Information [Line Items]
Net Property, Plant and Equipment	219,570	306,948	324,106
Indonesia [Member]
Segment Reporting Information [Line Items]
Net Property, Plant and Equipment	189,064	154,630	144,322
Spain [Member]
Segment Reporting Information [Line Items]
Net Property, Plant and Equipment	154,078	94,917	15,159
United States [Member]
Segment Reporting Information [Line Items]
Net Property, Plant and Equipment	46,537	54,647	201,815
Saudi Arabia [Member]
Segment Reporting Information [Line Items]
Net Property, Plant and Equipment	20,561	191,400	102,334
Australia [Member]
Segment Reporting Information [Line Items]
Net Property, Plant and Equipment		14	212,955
Malaysia [Member]
Segment Reporting Information [Line Items]
Net Property, Plant and Equipment		240,042
Other countries [Member]
Segment Reporting Information [Line Items]
Net Property, Plant and Equipment	3,541	1,513	56,463
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Assets, continuing operations	$872,582	$124,306	$387,686

Segment_Reporting_Information_4

Segment Reporting - Information about Unconsolidated Affiliates (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Other Significant Reconciling Item [Line Items]
Equity in Losses of Unconsolidated Affiliates	($7,848)	($16,116)	($16,719)
Investments in Unconsolidated Affiliates	38,186	50,536
Corporate and Other [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Investments in Unconsolidated Affiliates	866	993
Asia [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Equity in Losses of Unconsolidated Affiliates	-10,009	-10,738	-10,123
Investments in Unconsolidated Affiliates	35,722	49,423
Americas, Europe and Africa [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Equity in Losses of Unconsolidated Affiliates	4,829	-4,275	-6,016
Investments in Unconsolidated Affiliates	1,598	120
Middle East [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Equity in Losses of Unconsolidated Affiliates	($2,668)	($1,103)	($580)

Recovered_Sheet15

Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 23, 2004	Dec. 16, 2005	Jan. 29, 2007	Apr. 04, 2014
				LegalMatter	LegalMatter	LegalMatter	LegalMatter
Loss Contingencies [Line Items]
Legal claims	On December 16, 2005, a proceeding entitled Antoine, et al. vs. J. Ray McDermott, Inc., et al. (“Antoine Suit”), was filed in the 24th Judicial District Court, Jefferson Parish, Louisiana, by approximately 88 plaintiffs against approximately 215 defendants, including our subsidiaries formerly known as JRMI and Delta Hudson Engineering Corporation (“DHEC”), generally alleging injuries for exposure to asbestos, and unspecified chemicals, metals and noise while the plaintiffs were allegedly employed as Jones Act seamen. This case was dismissed by the Court on January 10, 2007, without prejudice to plaintiffs’ rights to refile their claims. On January 29, 2007, 21 plaintiffs from the dismissed Antoine Suit filed a matter entitled Boudreaux, et al. v. McDermott, Inc., et al. (the “Boudreaux Suit”), in the United States District Court for the Southern District of Texas, against JRMI and our subsidiary formerly known as McDermott Incorporated, and approximately 30 other employer defendants, alleging Jones Act seaman status and generally alleging exposure to welding fumes, solvents, dyes, industrial paints and noise. The Boudreaux Suit was transferred to the United States District Court for the Eastern District of Louisiana on May 2, 2007, which entered an order in September 2007 staying the matter until further order of the Court due to the bankruptcy filing of one of the co-defendants.
Environmental reserves, current	$3.70	$6.30
Aggregate possible liquidated damage due to failure to meet specified contractual milestone dates, offshore oil and gas construction segment	118.5
Liquidated damage contingencies, accrued	28
Trigger dates, potential liquidated damages	2015-07
Outstanding obligation	253.8
Total rental expense	$106.50	$116.60	$60.70
Certain Underwriters at Lloyd’s London, et al. v. J. Ray McDermott, Inc. et al. [Member]
Loss Contingencies [Line Items]
Number of defendants				2
Antoine, et al. vs. J. Ray McDermott, Inc., et al. [Member]
Loss Contingencies [Line Items]
Number of defendants					215
Number of plaintiffs					88
Antoine, et al. vs. J. Ray McDermott, Inc., et al. [Member] | Judicial District Court for Harris County, Texas [Member]
Loss Contingencies [Line Items]
Number of defendants						65
Number of plaintiffs						43
Antoine, et al. vs. J. Ray McDermott, Inc., et al. [Member] | Judicial District Court for Harris County, Texas [Member] | Maritime products [Member]
Loss Contingencies [Line Items]
Number of defendants						42
Number of plaintiffs							20
Boudreaux, et al. v. McDermott, Inc., et al. [Member] | United States District Court for the Southern District of Texas [Member]
Loss Contingencies [Line Items]
Number of defendants						30
Number of plaintiffs						21

Future_Minimum_Payments_Requir

Future Minimum Payments Required under Operating Leases that have Initial or Remaining Noncancellable Lease Terms in Excess of One Year (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Commitments And Contingencies Disclosure [Abstract]
2015	$25,051
2016	18,531
2017	15,155
2018	11,457
2019	12,288
Thereafter	$127,373

Recovered_Sheet16

Quarterly Financial Data (Unaudited) - Selected Unaudited Quarterly Financial Information (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenues	$806,400	$414,595	$476,083	$603,811	$517,338	$686,856	$647,250	$807,488	$2,300,889	$2,658,932	$3,641,624
Operating income (loss)	25,949	-10,711	31,525	-38,209	-317,896	-49,216	-146,321	56,688	8,554	-456,745	307,139
Net Income (Loss)	12,234	-25,946	-5,698	-45,984	-319,352	-55,609	-142,922	27,973	-65,394	-489,910	205,235
Less: net income attributable to noncontrolling interest	4,059	4,306	1,699	536	6,884	5,023	3,286	3,765	10,600	18,958	10,770
Net income (loss) attributable to McDermott International, Inc.	$8,175	($30,252)	($7,397)	($46,520)	($326,236)	($60,632)	($146,208)	$24,208	($75,994)	($508,868)	$194,465
Basic loss per common share:
Income (loss) from continuing operations less noncontrolling interest	$0.03	($0.13)	($0.03)	($0.20)	($1.38)	($0.26)	($0.62)	$0.10	($0.32)	($2.15)	$0.81
Net loss attributable to McDermott International, Inc.	$0.03	($0.13)	($0.03)	($0.20)	($1.38)	($0.26)	($0.62)	$0.10	($0.32)	($2.15)	$0.83
Diluted loss per common share:
Income (loss) from continuing operations less noncontrolling interest	$0.03	($0.13)	($0.03)	($0.20)	($1.38)	($0.26)	($0.62)	$0.10	($0.32)	($2.15)	$0.80
Net loss attributable to McDermott International, Inc.	$0.03	($0.13)	($0.03)	($0.20)	($1.38)	($0.26)	($0.62)	$0.10	($0.32)	($2.15)	$0.82

Recovered_Sheet17

Quarterly Financial Data (unaudited) (Parenthetical) (Detail) (USD $)	3 Months Ended	12 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2014	Jun. 30, 2014	Apr. 30, 2014	Jun. 30, 2014
Quarterly Financial Information [Line Items]
Gain on sale of assets	$12.50	$11.10
Impairment and restructuring charges	84.3
Americas, Europe and Africa [Member]
Quarterly Financial Information [Line Items]
Gain on sale of assets			1.3
Americas, Europe and Africa [Member] | Harbor Island Facility [Member]
Quarterly Financial Information [Line Items]
Gain on sale of assets				$25	$25.10

Recovered_Sheet18

Quarterly Financial Data (Unaudited) - Summary of adjustments on previously reported quarterly results (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Increase (decrease) to operating income (loss)	$6,369	$3,432	$3,433	$3,433	($2,263)	$3,438	$3,215	$3,655
Net income (loss)	$6,369	$3,432	$3,433	$3,433	($2,263)	$3,438	$3,215	$3,655
Basic loss per common share:
Net loss attributable to McDermott International, Inc.		$0.01	$0.01	$0.01	($0.01)	$0.01	$0.01	$0.02
Diluted loss per common share:
Net loss attributable to McDermott International, Inc.		$0.01	$0.01	$0.01	($0.01)	$0.01	$0.01	$0.02

Effect_of_Accounting_Change_Ad

Effect of Accounting Change - Additional information (Detail) (USD $)	Jan. 01, 2012
In Millions, unless otherwise specified
Accounting Changes And Error Corrections [Abstract]
Cumulative increase to accumulated deficit	$88.30

Effect_of_Accounting_Change_Sc

Effect of Accounting Change - Schedule of Consolidated Results and Financial Position (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Consolidated Statements of Operations:
Selling, general and administrative expenses									$208,564		$193,126		$218,162
Operating income (loss)	25,949	-10,711	31,525	-38,209	-317,896	-49,216	-146,321	56,688	8,554		-456,745		307,139
Net Income (Loss)	12,234	-25,946	-5,698	-45,984	-319,352	-55,609	-142,922	27,973	-65,394		-489,910		205,235
Net income (loss) attributable to McDermott International, Inc.	8,175	-30,252	-7,397	-46,520	-326,236	-60,632	-146,208	24,208	-75,994		-508,868		194,465
Basic earnings (loss) per share
Net income (loss) attributable to McDermott International, Inc.	$0.03	($0.13)	($0.03)	($0.20)	($1.38)	($0.26)	($0.62)	$0.10	($0.32)		($2.15)		$0.83
Diluted earnings (loss) per share:
Net income (loss) attributable to McDermott International, Inc.	$0.03	($0.13)	($0.03)	($0.20)	($1.38)	($0.26)	($0.62)	$0.10	($0.32)		($2.15)		$0.82
Consolidated Balance Sheets:
Retained Earnings/ (Accumulated Deficit)	-239,572				-163,578				-239,572		-163,578
Accumulated Other Comprehensive Income (Loss)	-97,808				-47,710				-97,808		-47,710		6,053
Consolidated Statements of Cash Flows:
Net Income (Loss)	12,234	-25,946	-5,698	-45,984	-319,352	-55,609	-142,922	27,973	-65,394		-489,910		205,235
Other non-cash items									-3,605		-6,029		6,837
Other assets and liabilities									11,653		-46,301		55,303
Pension liability and accrued postretirement and employee benefits									-1,861		-30,828		34,847
As Adjusted [Member]
Consolidated Statements of Operations:
Selling, general and administrative expenses									208,564		193,126		218,162
Operating income (loss)									8,554		-456,745		307,139
Net Income (Loss)									-65,394		-489,910		205,235
Net income (loss) attributable to McDermott International, Inc.									-75,994		-508,868		194,465
Basic earnings (loss) per share
Net income (loss) attributable to McDermott International, Inc.									($0.32)		($2.15)		$0.83
Diluted earnings (loss) per share:
Net income (loss) attributable to McDermott International, Inc.									($0.32)		($2.15)		$0.82
Consolidated Balance Sheets:
Retained Earnings/ (Accumulated Deficit)	-239,572				-163,578				-239,572		-163,578
Accumulated Other Comprehensive Income (Loss)	-97,808				-47,710				-97,808		-47,710
Consolidated Statements of Cash Flows:
Net Income (Loss)									-65,394		-489,910		205,235
Other non-cash items									-3,605		-6,029		6,837
Other assets and liabilities									11,653	[1]	-46,301	[1]	55,303	[1]
Pension liability and accrued postretirement and employee benefits									-1,861		-30,828		34,847
Previously Reported [Member]
Consolidated Statements of Operations:
Selling, general and administrative expenses									225,231		201,171		205,974
Operating income (loss)									-8,113		-464,790		319,327
Net Income (Loss)									-82,061		-497,955		217,423
Net income (loss) attributable to McDermott International, Inc.									-92,661		-516,913		206,653
Basic earnings (loss) per share
Net income (loss) attributable to McDermott International, Inc.									($0.39)		($2.19)		$0.88
Diluted earnings (loss) per share:
Net income (loss) attributable to McDermott International, Inc.									($0.39)		($2.19)		$0.87
Consolidated Statements of Comprehensive Income (Loss):
Unrealized gain (loss) on benefit plan revaluation									2,937		-9,542		-23,821
Amortization of benefit plan costs									13,730		17,587		11,633
Consolidated Balance Sheets:
Retained Earnings/ (Accumulated Deficit)	-163,818				-71,157				-163,818		-71,157
Accumulated Other Comprehensive Income (Loss)	-173,562				-140,131				-173,562		-140,131
Consolidated Statements of Cash Flows:
Net Income (Loss)									-82,061		-497,955		217,423
Other non-cash items									8,961		-3,463		8,367
Other assets and liabilities									15,754	[1]	-40,822	[1]	39,535	[1]
Pension liability and accrued postretirement and employee benefits									-1,861		-30,828		36,897
Net Effect of Change [Member]
Consolidated Statements of Operations:
Selling, general and administrative expenses									-16,667		-8,045		12,188
Operating income (loss)									16,667		8,045		-12,188
Net Income (Loss)									16,667		8,045		-12,188
Net income (loss) attributable to McDermott International, Inc.									16,667		8,045		-12,188
Basic earnings (loss) per share
Net income (loss) attributable to McDermott International, Inc.									$0.07		$0.04		($0.05)
Diluted earnings (loss) per share:
Net income (loss) attributable to McDermott International, Inc.									$0.07		$0.04		($0.05)
Consolidated Statements of Comprehensive Income (Loss):
Unrealized gain (loss) on benefit plan revaluation									-2,937		9,542		23,821
Amortization of benefit plan costs									-13,730		-17,587		-11,633
Consolidated Balance Sheets:
Retained Earnings/ (Accumulated Deficit)	-75,754				-92,421				-75,754		-92,421
Accumulated Other Comprehensive Income (Loss)	75,754				92,421				75,754		92,421
Consolidated Statements of Cash Flows:
Net Income (Loss)									16,667		8,045		-12,188
Other non-cash items									-12,566		-2,566		-1,530
Other assets and liabilities									-4,101	[1]	-5,479	[1]	15,768	[1]
Pension liability and accrued postretirement and employee benefits													($2,050)
[1]	Other assets and liabilities for the years ended December 31, 2013 and 2012 have been adjusted to conform with the current year presentation for the non-cash impacts of gain of foreign exchange, as described in Note 1.