Tidewater (TDW) 10-Q 13 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 02, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	TDW
Entity Registrant Name	TIDEWATER INC
Entity Central Index Key	98,222
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		27,263,262

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 461,088	$ 432,035
Restricted cash	7,466	21,300
Trade and other receivables, net	88,013	114,184
Due from affiliates	174,349	230,315
Marine operating supplies	27,591	28,220
Other current assets	9,880	19,130
Total current assets	768,387	845,184
Investments in, at equity, and advances to unconsolidated companies	1,129	29,216
Net properties and equipment	776,640	837,520
Deferred drydocking and survey costs	16,053	3,208
Other assets	28,700	31,052
Total assets	1,590,909	1,746,180
Current liabilities:
Accounts payable	30,571	38,497
Accrued expenses	46,060	54,806
Due to affiliates	48,064	99,448
Accrued property and liability losses	2,447	2,585
Current portion of long-term debt	7,671	5,103
Other current liabilities	18,894	19,693
Total current liabilities	153,707	220,132
Long-term debt	435,301	443,057
Accrued property and liability losses	4,212	2,471
Other liabilities	53,781	58,576
Commitments and Contingencies (Note 10)
Equity:
Successor Common stock of $0.001 par value, 125,000,000 shares authorized, 26,815,991 and 22,115,916 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	27	22
Additional paid-in capital	1,063,603	1,059,120
Retained deficit	(120,274)	(39,266)
Accumulated other comprehensive loss	(403)	(147)
Total stockholders’ equity	942,953	1,019,729
Noncontrolling interests	955	2,215
Total equity	943,908	1,021,944
Total liabilities and equity	$ 1,590,909	$ 1,746,180

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	26,815,991	22,115,916
Common stock, shares outstanding	26,815,991	22,115,916

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (LOSS) (Unaudited) - USD ($) $ in Thousands		1 Months Ended		2 Months Ended		3 Months Ended		7 Months Ended		9 Months Ended
		Jul. 31, 2017		Sep. 30, 2017		Sep. 30, 2018		Jul. 31, 2017		Sep. 30, 2018
Revenues:
Total revenues				$ 74,300		$ 99,192				$ 296,286
Costs and expenses:
Vessel operating costs				52,301		65,237				194,613
Costs of other operating revenues				2,273		1,681				4,797
General and administrative				16,246		25,546				73,536
Vessel operating leases				1,124
Depreciation and amortization				8,142		13,390				38,192
(Gain) / Loss on asset dispositions, net				(4)		1,571				(1,686)
Asset impairments						16,853	[1]			24,254	[2]
Total costs and expenses				80,082		124,278				333,706
Operating loss				(5,782)		(25,086)				(37,420)
Other income (expenses):
Foreign exchange gain (loss)				(58)		1				(1,349)
Equity in net earnings (losses) of unconsolidated companies				1,305		56				(14,993)
Interest income and other, net				873		2,709				5,495
Reorganization items				(1,880)
Interest and other debt costs, net				(5,240)		(7,585)				(22,731)
Total other income (expenses)				(5,000)		(4,819)				(33,578)
Loss before income taxes				(10,782)		(29,905)				(70,998)
Income tax expense				4,745		1,278				10,396
Net loss				(15,527)		(31,183)				(81,394)
Less: Net income (loss) attributable to noncontrolling interests				166		(287)				(386)
Net loss attributable to Tidewater Inc.				$ (15,693)		$ (30,896)				$ (81,008)
Basic loss per common share	[3]			$ (0.81)		$ (1.16)				$ (3.23)
Diluted loss per common share	[4]			$ (0.81)		$ (1.16)				$ (3.23)
Weighted average common shares outstanding	[5]			19,389,031		26,614,507				25,073,284
Adjusted weighted average common shares				19,389,031		26,614,507				25,073,284
Vessel Revenues
Revenues:
Total revenues				$ 70,571		$ 97,011				$ 288,679
Other Operating Revenues
Revenues:
Total revenues				$ 3,729	[6],[7]	$ 2,181	[7]			$ 7,607	[6]
Predecessor
Revenues:
Total revenues		$ 36,263						$ 312,118
Costs and expenses:
Vessel operating costs		32,665						197,283
Costs of other operating revenues		763						5,037
General and administrative		8,773						83,559
Vessel operating leases		623						14,607
Depreciation and amortization		11,160						85,039
(Gain) / Loss on asset dispositions, net		(372)						(9,625)
Asset impairments		21,325	[1]					249,606	[2]
Total costs and expenses		74,937						625,506
Operating loss		(38,674)						(313,388)
Other income (expenses):
Foreign exchange gain (loss)		(2,024)						(2,516)
Equity in net earnings (losses) of unconsolidated companies		269						7,627
Interest income and other, net		704						3,974
Reorganization items		(1,083,729)						(1,396,905)
Interest and other debt costs, net		(574)						(32,188)
Total other income (expenses)		(1,085,354)						(1,420,008)
Loss before income taxes		(1,124,028)						(1,733,396)
Income tax expense		(1,529)						483
Net loss		(1,122,499)						(1,733,879)
Less: Net income (loss) attributable to noncontrolling interests		(24)						7,884
Net loss attributable to Tidewater Inc.		$ (1,122,475)						$ (1,741,763)
Basic loss per common share	[3]	$ (23.82)						$ (36.98)
Diluted loss per common share	[4]	$ (23.82)						$ (36.98)
Weighted average common shares outstanding	[5]	47,121,407						47,104,117
Adjusted weighted average common shares		47,121,407						47,104,117
Predecessor | Vessel Revenues
Revenues:
Total revenues		$ 34,340						$ 303,501
Predecessor | Other Operating Revenues
Revenues:
Total revenues		$ 1,923	[7]					$ 8,617	[6]
[1]	Refer to Note (14) for additional information regarding asset impairment.
[2]	Refer to Note (14) for additional information regarding asset impairment.
[3]	The company calculates “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding shares of common stock, basic”.
[4]	The company calculates “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average common stock and equivalents”.
[5]	Common shares and New Creditor Warrants and the sum of common shares and New Creditor Warrants outstanding at September 30, 2018, were 26,815,991, 3,512,416 and 30,328,407, respectively.
[6]	Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from January 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $1.1 million, respectively  of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017.
[7]	Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from July 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $0.4 million, respectively of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017.

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Jul. 31, 2017	Sep. 30, 2018
Net loss		$ (15,527)		$ (81,394)
Other comprehensive income:
Unrealized gains (losses) on available for sale securities, net of tax of $0, $0 and $0		82		(256)
Total comprehensive loss		$ (15,445)		$ (81,650)
Predecessor
Net loss	$ (1,122,499)		$ (1,733,879)
Other comprehensive income:
Unrealized gains (losses) on available for sale securities, net of tax of $0, $0 and $0	77		67
Change in loss on derivative contract, net of tax of $0, $0 and $823			1,317
Change in supplemental executive retirement plan liability, net of tax of $0, $0 and $0	(536)		(2,257)
Change in pension plan minimum liability, net of tax of $0, $0 and $0	(594)		(195)
Change in other benefit plan minimum liability, net of tax of $0, $0 and $0	(1,468)		(5,267)
Total comprehensive loss	$ (1,125,020)		$ (1,740,214)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Jul. 31, 2017	Sep. 30, 2018
Unrealized gains (losses) on available-for-sale securities, tax		$ 0	$ 0		$ 0
Change in loss on derivative contract, tax		0	0		0
Change in supplemental executive retirement plan liability, tax		0	0		0
Change in Pension Plan minimum liability, tax		0	0		0
Change in Other Benefit Plan minimum liability, tax		$ 0	$ 0		$ 0
Predecessor
Unrealized gains (losses) on available-for-sale securities, tax	$ 0			$ 61
Change in loss on derivative contract, tax	823			823
Change in supplemental executive retirement plan liability, tax	0			(927)
Change in Pension Plan minimum liability, tax	0			215
Change in Other Benefit Plan minimum liability, tax	$ 0			$ (2,046)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		2 Months Ended	7 Months Ended	9 Months Ended
		Sep. 30, 2017	Jul. 31, 2017	Sep. 30, 2018
Operating activities:
Net loss		$ (15,527)		$ (81,394)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization		8,138		33,949
Amortization of deferred drydocking and survey costs		4		4,243
Amortization of debt premium and discounts		(281)		(1,371)
Gain on asset dispositions, net		(4)		(1,686)
Asset impairments	[1]			24,254
Changes in investments in, at equity, and advances to unconsolidated companies		(1,044)		28,087
Compensation expense - stock-based		1,173		9,967
Changes in assets and liabilities, net:
Trade and other receivables		(3,775)		(10,744)
Changes in due to/from related parties, net		(3,920)		28,290
Marine operating supplies		1,005		(1,411)
Other current assets		5,714		9,032
Accounts payable		(317)		1,719
Accrued expenses		(10,555)		(10,719)
Accrued property and liability losses		13		(138)
Other current liabilities		3,753		5,802
Other liabilities		(847)		(232)
Cash paid for deferred drydocking and survey costs		(392)		(17,088)
Other, net		(947)		1,670
Net cash provided by (used in) operating activities		(17,809)		22,230
Cash flows from investing activities:
Proceeds from sales of assets		4,875		16,499
Additions to properties and equipment		(589)		(9,116)
Net cash provided by (used in) investing activities		4,286		7,383
Cash flows from financing activities:
Principal payment on long-term debt				(4,020)
Payments to General Unsecured Creditors		(87,366)		(8,377)
Other		1		(1,997)
Net cash used in financing activities		(87,365)		(14,394)
Net change in cash, cash equivalents and restricted cash		(100,888)		15,219
Cash, cash equivalents and restricted cash at beginning of period		560,866		453,335
Cash, cash equivalents and restricted cash at end of period		459,978	$ 560,866	468,554
Cash paid during the period for:
Interest, net of amounts capitalized		59		24,218
Income taxes		1,392		$ 13,679
Predecessor
Operating activities:
Net loss			(1,733,879)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Reorganization items			1,368,882
Depreciation and amortization			85,039
Provision for deferred income taxes			(7,743)
Gain on asset dispositions, net			(9,625)
Asset impairments	[1]		249,606
Changes in investments in, at equity, and advances to unconsolidated companies			(9,314)
Compensation expense - stock-based			819
Excess tax liability on stock option activity			4,927
Changes in assets and liabilities, net:
Trade and other receivables			57,337
Changes in due to/from related parties, net			26,262
Marine operating supplies			(320)
Other current assets			(8,298)
Accounts payable			(10,715)
Accrued expenses			24,339
Accrued property and liability losses			(813)
Other current liabilities			(7,131)
Other liabilities			4,768
Other, net			14,422
Net cash provided by (used in) operating activities			48,563
Cash flows from investing activities:
Proceeds from sales of assets			4,636
Additions to properties and equipment			(10,620)
Proceeds related to novated vessel construction contract			5,272
Net cash provided by (used in) investing activities			(712)
Cash flows from financing activities:
Principal payment on long-term debt			(7,856)
Payments to General Unsecured Creditors			(122,806)
Other			(6,127)
Net cash used in financing activities			(136,789)
Net change in cash, cash equivalents and restricted cash			(88,938)
Cash, cash equivalents and restricted cash at beginning of period		$ 560,866	649,804
Cash, cash equivalents and restricted cash at end of period			560,866
Cash paid during the period for:
Interest, net of amounts capitalized			9,795
Income taxes			$ 6,907
[1]	Refer to Note (14) for additional information regarding asset impairment.

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Retained (deficit) earnings	Accumulated other comprehensive loss	Non controlling interest
Balance (Predecessor) at Dec. 31, 2016	$ 1,747,564	$ 4,707	$ 171,018	$ 1,570,027	$ (6,446)	$ 8,258
Total comprehensive loss | Predecessor	(1,740,214)			(1,741,764)	(6,333)	7,883
Stock option expense | Predecessor	659		659
Cancellation/forfeiture or restricted stock units | Predecessor	1,411		1,254	157
Amortization of restricted stock units | Predecessor	(6,059)	5	(6,064)
Cash paid to noncontrolling interests | Predecessor	(1,200)					(1,200)
Balance (Predecessor) at Jul. 31, 2017	2,161	4,712	166,867	(171,580)	(12,779)	14,941
Balance at Jul. 31, 2017	1,057,084	18	1,055,391			1,675
Cancellation of Predecessor equity | Predecessor	(486)	(4,712)	(166,867)	171,580	12,779	(13,266)
Balance (Predecessor) at Jul. 31, 2017	1,675					1,675
Balance (Predecessor) at Jun. 30, 2017					(10,258)
Total comprehensive loss | Predecessor	(1,125,020)
Balance (Predecessor) at Jul. 31, 2017	2,161	4,712	166,867	(171,580)	(12,779)	14,941
Balance at Jul. 31, 2017	1,057,084	18	1,055,391			1,675
Balance (Predecessor) at Jul. 31, 2017	1,675					1,675
Total comprehensive loss	(15,445)			(15,693)	82	166
Issuance of common stock	2	3	(1)
Amortization of restricted stock units	1,173		1,173
Balance at Sep. 30, 2017	1,042,814	21	1,056,563	(15,693)	82	1,841
Issuance of Successor common stock and warrants	1,055,409	18	1,055,391
Balance at Dec. 31, 2017	1,021,944	22	1,059,120	(39,266)	(147)	2,215
Total comprehensive loss	(81,650)			(81,008)	(256)	(386)
Issuance of common stock	3	5	(2)
Amortization of restricted stock units	5,611		5,611
Acquisition of noncontrolling interest	(2,000)		(1,126)			(874)
Balance at Sep. 30, 2018	943,908	27	1,063,603	(120,274)	(403)	955
Balance at Sep. 30, 2018	955
Balance at Jun. 30, 2018					(403)
Total comprehensive loss	(31,183)
Balance at Sep. 30, 2018	943,908	$ 27	$ 1,063,603	$ (120,274)	$ (403)	$ 955
Balance at Sep. 30, 2018	$ 955

INTERIM FINANCIAL STATEMENTS

INTERIM FINANCIAL STATEMENTS	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
INTERIM FINANCIAL STATEMENTS	(1) INTERIM FINANCIAL STATEMENTS The unaudited condensed consolidated financial statements for the interim periods presented herein have been prepared in conformity with United States generally accepted accounting principles and, in the opinion of management, include all adjustments (consisting only of normal recurring adjustments) necessary for a fair presentation of the unaudited condensed consolidated financial statements at the dates and for the periods indicated as required by Rule 10-01 of Regulation S‑X of the Securities and Exchange Commission (SEC). Results of operations for interim periods are not necessarily indicative of results of operations for the respective full years. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto in the Tidewater Inc. (the company) Transition Report on Form 10-K for the nine month period ended December 31, 2017, filed with the SEC on March 15, 2018. The unaudited condensed consolidated financial statements include the accounts of the company and its subsidiaries. Intercompany balances and transactions are eliminated in consolidation. The company uses the equity method to account for equity investments over which the company exercises significant influence but does not exercise control and is not the primary beneficiary. Unless otherwise specified, all per share information included in this document is on a diluted earnings per share basis. Reorganization and Fresh Start Accounting References to "Successor" or "Successor Company" relate to the financial position and results of operations of the reorganized company subsequent to July 31, 2017. References to "Predecessor" or "Predecessor Company" relate to the financial position and results of operations of the company through July 31, 2017. On Ju ly 31, 2017, the company and certain of its subsidiaries that had been named as additional debtors in the Chapter 11 proceedings emerged Upon the company's emergence from Chapter 11 bankruptcy, the company qualified for and adopted fresh-start accounting in accordance with the provisions set forth in ASC 852, which requires the company to present its assets, liabilities, and equity as if it were a new entity upon emergence from bankruptcy. The implementation of the Plan and the application of fresh-start accounting materially changed the carrying amounts and classifications reported in the company’s consolidated financial statements and resulted in the company becoming a new entity for financial reporting purposes. As a result of the application of fresh-start accounting and the effects of the implementation of the Plan, the financial statements after July 31, 2017 are not comparable with the financial statements prior to July 31, 2017. Therefore, "black-line" financial statements are presented to distinguish between the Predecessor and Successor companies.

ACCOUNTING PRONOUNCEMENTS

ACCOUNTING PRONOUNCEMENTS	9 Months Ended
	Sep. 30, 2018
Accounting Changes And Error Corrections [Abstract]
ACCOUNTING PRONOUNCEMENTS	(2) ACCOUNTING PRONOUNCEMENTS From time to time new accounting pronouncements are issued by the FASB that are adopted by the company as of the specified effective date. Unless otherwise discussed, management believes that the impact of recently issued standards, which are not yet effective, will not have a material impact on the company’s consolidated financial statements upon adoption. In March 2017, the FASB issued ASU 2017-7, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Costs and Net Periodic Postretirement Benefit Costs In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory required a modified retrospective approach In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, In February 2016, the FASB issued ASU 2016-02, Leases In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers he necessary changes to the company’s business processes, systems and controls to support recognition and disclosure of this ASU upon adoption on January 1, 2018, have been implemented.

REVENUE RECOGNITION

REVENUE RECOGNITION	9 Months Ended
	Sep. 30, 2018
Revenue From Contract With Customer [Abstract]
REVENUE RECOGNITION	(3) REVENUE RECOGNITION The company’s primary source of revenue is derived from time charter contracts for which the company provides a vessel and crew on a rate per day of service basis. Services provided under respective charter contracts represent a single performance obligation satisfied over time and are comprised of a series of time increments . ct. Customers are typically billed on a monthly basis for dayrate services and payment terms are generally 30 to 45 days. Occasionally, customers pay additional lump-sum fees to the company in order to either mobilize a vessel to a new location prior to the start of a charter contract or demobilize the vessel at the end of a charter contract. Mobilizations are not considered to be a separate performance obligation; thus, the company has determined that mobilization fees are a component of the vessel’s charter contract. As such, the company defers lump-sum mobilization fees as a liability and recognizes such fees as revenue consistent with the pattern of revenue recognition (primarily on a straight-line basis) over the term of the vessel’s respective charter. Lump-sum demobilization revenue expected to be received upon contract termination is deferred as an asset and recognized ratably as revenue but only in circumstances where the receipt of the demobilization fee at the end of the contract is estimable and there is a high degree of certainty that collection will occur. Costs associated with mobilizations and demobilizations are recognized in vessel operating expense. Customers also occasionally reimburse the company for modifications to vessels in order to meet contractual requirements. These vessel modifications are not considered to be a separate performance obligation of the vessel’s charter; thus, the company records a liability for lump-sum payments made by customers for vessel modification and recognizes it as revenue consistent with the pattern of revenue recognition (primarily on a straight-line basis) over the term of the vessel’s respective charter. Total revenue is determined for each individual contract by estimating both fixed (mobilization, demobilization and vessels modifications) and variable (dayrate services) consideration expected to be earned over the contract term. The company has applied the optional exemption under the revenue standard and has not disclosed the estimated transaction price related to the variable portion of the unsatisfied performance obligation at the end of the reporting period. Prior to the adoption of ASU 2014-09, the company recognized mobilization fees as revenue in the period earned and customer reimbursed vessel modifications were not reflected in earnings. Costs associated with customer-directed mobilizations and reimbursed modifications to vessels are considered costs of fulfilling a charter contract and are expected to be recovered. Mobilization costs such as crew, travel, fuel, port fees, temporary importation fees and other costs are deferred as an asset and amortized as other vessel operating expenses consistent with the pattern of revenue recognition (primarily on a straight-line basis) over the term of such vessel’s charter. Costs incurred for modifications to vessels in order to meet contractual requirements are capitalized as a fixed asset and depreciated either over the term of the respective charter contract or over the remaining estimated useful life of the vessel in instances where the modification is a permanent upgrade to the vessel and enhances its usefulness. The following tables disclose the amount of revenue by segment and in total for the worldwide fleet: Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Vessel revenues: Americas $ 28,039 17,449 8,961 Middle East/Asia Pacific 19,927 16,669 8,547 Europe/Mediterranean Sea 12,566 8,860 4,435 West Africa 36,479 27,593 12,397 97,011 70,571 34,340 Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Vessel revenues: Americas (A) $ 86,721 17,449 121,380 Middle East/Asia Pacific 60,721 16,669 62,991 Europe/Mediterranean Sea 35,546 8,860 25,631 West Africa 105,691 27,593 93,499 288,679 70,571 303,501 (A) Included in Americas and total vessel revenues for the period January 1, 2017 through July 31, 2017 (Predecessor), is $39.1 million of revenue related to the early cancellation of a long-term vessel charter contract. Contract Balances Trade accounts receivables are recognized when revenue is earned and collectible. Contract assets include pre-contract costs, primarily related to vessel mobilizations, which have been deferred and will be amortized as other vessel expenses consistent with the pattern of revenue recognition (primarily on a straight-line basis) over the term of such vessel’s charter. Contract liabilities include payments received for mobilizations or reimbursable vessel modifications to be recognized consistent with the pattern of revenue recognition (primarily on a straight-line basis) over the term of such vessel’s charter. At September 30, 2018, the company had $0.3 million of deferred mobilization costs included within other current assets and $0.6 million of contract liabilities/deferred revenue included within other current liabilities. The table below summarizes the revenue expected to be recognized in future quarters related to unsatisfied performance obligations as of September 30, 2018: (In thousands) December 31, 2018 Total Contract liabilities/deferred revenue $ 552 552 The impact of adopting the new revenue recognition guidance on the unaudited condensed consolidated balance sheets, statement of earnings (loss) and statement of cash flows as of and for the nine months ended September 30, 2018, was immaterial.

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
STOCKHOLDERS' EQUITY	(4) STOCKHOLDERS' EQUITY Accumulated Other Comprehensive Loss The changes in accumulated other comprehensive income (loss) by component, net of tax, are as follows: Successor Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 Balance Gains/(losses) Reclasses Net Remaining Balance Gains/(losses) Reclasses Net Remaining at recognized from period balance at recognized from period balance (in thousands) 6/30/18 in OCI net income OCI 9/30/18 12/31/17 in OCI net income OCI 9/30/18 Available for sale securities — — — — — 256 (660 ) 404 (256 ) — Pension/Post- retirement benefits (403 ) — — — (403 ) (403 ) — — — (403 ) Total (403 ) — — — (403 ) (147 ) (660 ) 404 (256 ) (403 ) Predecessor Successor Period from July 1, 2017 through July 31, 2017 Period from August 1, 2017 through September 30, 2017 Balance Gains/(losses) Reclasses Net Remaining Balance Gains/(losses) Reclasses Net Remaining at recognized from period balance at recognized from period balance (in thousands) 6/30/17 in OCI net income OCI 7/31/17 7/30/17 in OCI net income OCI 9/30/17 Available for sale securities (9 ) 51 26 77 68 — 7 75 82 82 Currency translation adjustment (9,811 ) — — — (9,811 ) — — — — — Pension/Post- retirement benefits (438 ) (2,598 ) — (2,598 ) (3,036 ) — — — — — Total (10,258 ) (2,547 ) 26 (2,521 ) (12,779 ) — 7 75 82 82 Predecessor Successor Period from January 1, 2017 through July 31, 2017 Period from August 1, 2017 through September 30, 2017 Balance Gains/(losses) Reclasses Net Remaining Balance Gains/(losses) Reclasses Net Remaining at recognized from period balance at recognized from period balance (in thousands) 12/31/16 in OCI net income OCI 7/31/17 7/31/17 in OCI net income OCI 9/30/17 Available for sale securities (1 ) (158 ) 227 69 68 — 7 75 82 82 Currency translation adjustment (9,811 ) — — — (9,811 ) — — — — — Pension/Post- retirement benefits 4,683 (7,719 ) — (7,719 ) (3,036 ) — — — — — Interest rate swap (1,317 ) — 1,317 1,317 — — — — — — Total (6,446 ) (7,877 ) 1,544 (6,333 ) (12,779 ) — 7 75 82 82 The following tables summarize the reclassifications from accumulated other comprehensive income (loss) to the condensed consolidated statement of income: Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through Affected line item in the (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 consolidated statements of income Realized gains on available for sale securities — 75 26 Interest income and other, net Total pre-tax amounts — 75 26 Tax effect — — — Total gains for the period, net of tax $ — 75 26 Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through Affected line item in the (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 consolidated statements of income Realized gains on available for sale securities $ 404 75 431 Interest income and other, net Interest rate swap — — 2,140 Interest and other debt costs Total pre-tax amounts 404 75 2,571 Tax effect — — 1,027 Total gains for the period, net of tax $ 404 75 1,544

INCOME TAXES

INCOME TAXES	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	(5) INCOME TAXES For all periods prior to March 31, 2015, we calculated the provision for income taxes during interim reporting periods by applying an estimate of the annual effective tax rate for the full fiscal year to “ordinary” income or loss (pretax income or loss excluding unusual or infrequently occurring discrete items) for the reporting period. Beginning in the quarter ended June 30, 2015, we use a discrete effective tax rate method to calculate taxes for interim periods. We determined that due to the level of volatility and unpredictability of earnings in our industry, both overall and by jurisdiction, use of the discrete method would continue to be proper for the period ended September 30, 2018. Income tax expense for the quarter ended September 30, 2018, reflects tax liabilities in various jurisdictions that are either based on revenue (deemed profit regimes) or pre-tax profits. The tax liabilities for uncertain tax positions are primarily attributable to permanent establishment issues related to a foreign joint venture. Penalties and interest related to income tax liabilities are included in income tax expense. Income tax payable is included in other current liabilities. Unrecognized tax benefits, which would lower the effective tax rate if realized at September 30, 2018, are as follows: September 30, (In thousands) 2018 Unrecognized tax benefit related to state tax issues $ 12,425 Interest receivable on unrecognized tax benefit related to state tax issues $ 60 As of December 31, 2017, the company’s balance sheet reflected approximately $43.2 million of net deferred tax assets with a valuation allowance of $43.2 million. As of September 30, 2018, the company has net deferred tax assets of approximately $50.9 million prior to a valuation allowance analysis. Management assesses all available positive and negative evidence to estimate the company’s ability to generate sufficient future taxable income of the appropriate character, and in the appropriate taxing jurisdictions, to permit use of existing deferred tax assets. A significant piece of objective negative evidence is a cumulative loss incurred over a three-year period in a taxing jurisdiction. Prevailing accounting practice is that such objective evidence would limit the ability to consider other subjective evidence, such as projections for future growth. On the basis of this evaluation, a valuation allowance of $50.9 million has been recorded against net deferred tax assets which are more likely than not to be unrealized. The amount of deferred tax assets considered realizable could be adjusted if future estimates of U.S. taxable income change, or if objective negative evidence in the form of cumulative losses is no longer present and subjective evidence, such as financial projections for future growth and tax planning strategies, are given additional weight. With limited exceptions, the company is no longer subject to tax audits by U.S. federal, state, local or foreign taxing authorities for years prior to 2014. The company has ongoing examinations by various foreign tax authorities and does not believe that the results of these examinations will have a material adverse effect on the company’s financial position, results of operations, or cash flows. On December 22, 2017, the Tax Cuts and Jobs Act (“Tax Act”) was enacted. As of September 30, 2018, the company has not completed its accounting for the tax effects of enactment of the Tax Act. The Securities and Exchange Commission issued Staff Accounting Bulletin No. 118, or SAB 118, to address the accounting and reporting of the Tax Act. SAB 118 allows companies to take a reasonable period, which should not extend beyond one year from enactment of the Tax Act, to measure and recognize the effects of the new tax law. For various reasons discussed further below, we have not yet completed the accounting for the income tax effects of certain elements of the Tax Act. However, we were able to make reasonable estimates of certain effects and, therefore, recorded provisional adjustments as discussed below: Reduction of U.S. federal corporate tax rate : The Tax Act reduces the corporate tax rate to 21 percent effective January 1, 2018. Therefore, the company made a reasonable estimate of the effects on existing deferred tax balances as of December 31, 2017. While we were able to make a reasonable estimate of the impact of the reduction in the corporate rate, it may be affected by other analyses related to the Tax Act, including, but not limited to, our calculation of the one-time transition tax. During the nine month period ended September 30, 2018, we recognized no adjustments to the provisional amounts recorded at December 31, 2017. One Time Transition Tax: The deemed repatriation transition tax is a tax on previously untaxed accumulated and current earnings and profits (E&P) of certain of our foreign subsidiaries. To determine the amount of the transition tax, we must determine, in addition to other factors, the amount of post-1986 E&P of the relevant subsidiaries. We were able to make a reasonable estimate of the one-time transition tax and recognized a provisional deemed dividend inclusion at December 31, 2017. During the nine month period ended September 30, 2018, we recognized no adjustments to the provisional amounts recorded at December 31, 2017. Global Intangible Low-taxed Income (“GILTI”): The company continues to evaluate the impacts of the newly enacted GILTI provisions which subject the company’s foreign earnings to a minimum level of tax. Because of the complexities of the new legislation, the company has not elected an accounting policy for GILTI at this time. Recent FASB guidance indicates that accounting for GILTI either as part of deferred taxes or as a period cost are both acceptable methods. Once further information is gathered and interpretation and analysis of the tax legislation evolves, the company will make an appropriate accounting method election. For the nine month period ended September 30, 2018, we were able to make a reasonable estimate of GILTI and do not expect that it will have a material impact on our 2018 financial statements. Base Erosion Anti-abuse Tax (“BEAT”) : The BEAT provisions in the Tax Act eliminate the deduction of certain base-erosion payments made to related foreign corporations beginning in 2018. For the nine month period ended September 30, 2018, we are in the process of analyzing the impact of BEAT and have provisionally concluded that we are below the required thresholds defined in the Tax Act. Therefore, we do not expect BEAT to have a material impact on our 2018 financial statements. Foreign-Derived Intangible Income (“FDII ”): The FDII provisions in the Tax Act provide tax incentives to U.S. companies to earn income from the sale, lease or license of goods and services abroad in the form of a deduction for foreign-derived intangible income. For the nine month period ended September 30, 2018, we are in the process of analyzing the impact of FDII and have provisionally concluded FDII will be inapplicable in 2018 due to our net operating loss position. Therefore, we do not expect FDII to have a material impact on our 2018 financial statements. Executive Compensation: The Tax Act expanded the number of individuals whose compensation is subject to a $1.0 million cap on deductibility under Section 162(m) and repealed the exclusion for performance-based compensation. For the nine month period ended September 30, 2018, we were able to make a reasonable estimate of the impact of the executive compensation changes and do not expect those changes to have a material impact on our 2018 financial statements. Interest Expense Limitation: The Tax Act limits the deduction for net interest expense that exceeds 30% of the adjusted taxable income for the year under IRC Section 163(j). For the nine month period ended September 30, 2018, we were able to make a reasonable estimate of the interest expense limitation and have included the resulting limitation of approximately $11 million before consideration of the valuation allowance in the financial statements. We recorded this adjustment as of September 30, 2018; however, because of the offsetting adjustment to our valuation allowance we estimate no impact to 2018 net income as a result of this provision.

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS	9 Months Ended
	Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]
EMPLOYEE BENEFIT PLANS	(6) EMPLOYEE BENEFIT PLANS U.S. Defined Benefit Pension Plan The company has a defined benefit pension plan (pension plan) that covers certain U.S. citizen employees and other employees who are permanent residents of the United States. Effective April 1, 1996, the pension plan was closed to new participation. In December 2009, the Board of Directors amended the pension plan to discontinue the accrual of benefits on December 31, 2010. This change did not affect benefits earned by participants prior to January 1, 2011. The company did not contribute to the pension plan during the three months and nine months ended September 30, 2018. The company did not contribute to the pension plan during the , Supplemental Executive Retirement Plan The company maintains a non-contributory, defined benefit supplemental executive retirement plan (supplemental plan) that provides pension benefits to certain employees in excess of those allowed under the company’s tax-qualified pension plan. Effective March 4, 2010, the supplemental plan was closed to new participation. The supplemental plan is a non-qualified plan and, as such, the company is not required to make contributions to the supplemental plan. During the three and nine month periods ended September 30, 2018, the company contributed $0.3 million and $0.6 million, respectively. The company did not contribute to the supplemental plan during the . A Rabbi Trust has been established for the benefit of participants in the supplemental plan. The Rabbi Trust assets, which were invested in a variety of marketable securities (but not the company’s stock), were recorded at fair value with unrealized gains or losses included in accumulated other comprehensive income (loss) until the investments were sold in the March 2018 quarter. Investments held in the Rabbi Trust at September 30, 2018 (consisting only of money market funds) and December 31, 2017, were included in other assets at fair value. The following table summarizes the carrying value of the trust assets, including unrealized gains or losses at September 30, 2018 and December 31, 2017: Successor September 30, December 31, (In thousands) 2018 2017 Investments held in Rabbi Trust at fair value $ 38 8,908 Unrealized gains in fair value of trust assets — 256 Obligations under the supplemental plan 23,711 32,508 The company’s obligations under the supplemental plan are included in ‘accrued expenses’ and ‘other liabilities’ on the consolidated balance sheet. Jeffrey M. Platt retired from his position as the company’s President and Chief Executive Officer and resigned as a member of the company’s board of directors (the “Board”), effective October 15, 2017. As a result of Mr. Platt’s retirement, he received in May 2018 an $8.9 million lump sum distribution in settlement of his supplemental executive retirement plan obligation. A settlement loss of approximately $0.3 million was recorded during the three months ended June 30, 2018. Postretirement Benefit Plan Qualified retired employees currently are covered by a plan which provides limited health care and life insurance benefits. Costs of the plan are based on actuarially determined amounts and are accrued over the period from the date of hire to the full eligibility date of employees who are expected to qualify for these benefits. This plan is funded through payments by the company as benefits are required. The company eliminated the life insurance portion of its post retirement benefit effective January 1, 2018. Net Periodic Benefit Costs The net periodic benefit cost for the company’s defined benefit pension plans and supplemental plan (referred to collectively as “Pension Benefits”) and the postretirement health care and life insurance plan (referred to collectively as “Other Benefits”) is comprised of the following components: Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Pension Benefits: Service cost $ 47 203 99 Interest cost 872 624 328 Expected return on plan assets (481 ) (332 ) (173 ) Administrative expenses 3 2 1 Payroll tax of net pension costs — — — Amortization of net actuarial losses — — — Recognized actuarial loss — — 187 Settlement loss recognized — — — Net periodic pension cost $ 441 497 442 Other Benefits: Service cost $ 15 12 6 Interest cost 29 30 16 Amortization of prior service cost (75 ) — (232 ) Recognized actuarial benefit 11 — (83 ) Net periodic postretirement (benefit) cost $ (20 ) 42 (293 ) Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Pension Benefits: Service cost $ 118 203 812 Interest cost 2,656 624 2,304 Expected return on plan assets (1,446 ) (332 ) (1,292 ) Administrative expenses 6 2 25 Payroll tax of net pension costs — — 56 Amortization of net actuarial losses — — 32 Recognized actuarial loss — — 1,195 Settlement loss recognized 335 — — Net periodic pension cost $ 1,669 497 3,132 Other Benefits: Service cost $ 45 12 44 Interest cost 88 30 115 Amortization of prior service cost (224 ) — (2,015 ) Recognized actuarial benefit 32 — (618 ) Net periodic postretirement (benefit) cost $ (59 ) 42 (2,474 ) The company also has a defined benefit pension plan that covers certain Norwegian citizen employees and other employees who are permanent residents of Norway. Benefits are based on years of service and employee compensation. The company did not contribute to the plan during the quarter ended September 30, 2018 and contributed 1.9 million NOK (approximately $0.2 million) during the nine months ended September 30, 2018. During the period from January 1, 2017 and July 31, 2017 (Predecessor) the company contributed approximately million NOK .

INDEBTEDNESS

INDEBTEDNESS	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
INDEBTEDNESS	(7) INDEBTEDNESS The following is a summary of all debt outstanding at September 30, 2018 and December 31, 2017: September 30, December 31, (In thousands) 2018 2017 Secured notes: 8.00% Secured notes due August 2022 (A) 349,954 350,000 Troms Offshore borrowings (B): NOK denominated notes due May 2024 13,593 14,054 NOK denominated notes due January 2026 24,545 25,965 USD denominated notes due January 2027 22,116 23,345 USD denominated notes due April 2027 24,810 25,463 $ 435,018 438,827 Debt premiums and discounts, net 7,954 9,333 Less: Current portion of long-term debt (7,671 ) (5,103 ) Total long-term debt $ 435,301 443,057 (A) As of September 30, 2018 and December 31, 2017, the fair value (Level 2) of the Secured Notes was $369.2 million and $359.8 million, respectively. (B) The company pays principal and interest on these notes semi-annually. As of September 30, 2018 and December 31, 2017, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $85.0 million and $88.5 million, respectively. The weighted average interest rate of the Troms Offshore borrowings as of September 30, 2018, was 5.01%. Secured Notes Tender Offer Pursuant to the Secured Notes indenture dated July 31, 2017, among the company, each of the guarantors party thereto, and Wilmington Trust, National Association, as Trustee and Collateral Agent (the “Indenture”) governing the Notes, the company is required to make cash offers to the registered or beneficial holders (the “Holders” and each, a “Holder”) of the Notes within 60 days of the date that the net proceeds realized by the company from Asset Sales (as defined in the Indenture, but which generally equates to 65% of the proceeds from Asset Sales, net of any commission paid) exceed $10.0 million (the “Asset Sale Threshold”). Since the issuance of the Notes, the company executed certain Asset Sales and on December 19, 2017, the aggregate net proceeds realized from such Asset Sales exceeded the Asset Sale Threshold, which triggered the obligation under the Indenture for the company to commence the Offer. On February 2, 2018, the company commenced an offer to purchase (the “Offer”) up to $24.7 million aggregate principal amount (the “Offer Amount”) of its outstanding 8.00% senior secured notes due 2022 (the “Notes”) for cash. On March 7, 2018, we purchased $46,023 aggregate principal amount of the Notes that were validly tendered in accordance with the terms and conditions of the Offer. Because the aggregate principal amount of tendered and accepted Notes was less than the Offer Amount, cash in an amount equal to the difference between the Offer Amount and the principal amount of the Notes accepted for tender became available for use by the company in any manner not prohibited by the Indenture and is no longer shown as restricted cash on the balance sheet. The $7.5 million restricted cash on the balance sheet at September 30, 2018, represents additional proceeds from Asset Sales since the date of the February 2018 tender offer and is, therefore, restricted by the terms of the Indenture. Debt Costs The company capitalizes a portion of its interest costs incurred on borrowed funds used to construct vessels. The following is a summary of interest and debt costs incurred, net of interest capitalized. Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Interest and debt costs incurred, net of interest capitalized $ 7,585 $ 5,240 574 Interest costs capitalized 153 — — Total interest and debt costs $ 7,738 $ 5,240 574 Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Interest and debt costs incurred, net of interest capitalized $ 22,731 $ 5,240 32,188 Interest costs capitalized 521 — 1,817 Total interest and debt costs $ 23,252 $ 5,240 34,005

LOSS PER SHARE

LOSS PER SHARE	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
LOSS PER SHARE	(8) LOSS PER SHARE The components of basic and diluted loss per share are as follows: Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through (In thousands, except share and per share data) September 30, 2018 September 30, 2017 July 31, 2017 Net loss available to common shareholders $ (30,896 ) (15,693 ) (1,122,475 ) Weighted average outstanding shares of common stock, basic (A) 26,614,507 19,389,031 47,121,407 Dilutive effect of options, warrants and restricted stock awards and units — — — Weighted average shares of common stock and equivalents 26,614,507 19,389,031 47,121,407 Loss per share, basic (B) $ (1.16 ) (0.81 ) (23.82 ) Loss per share, diluted (C) $ (1.16 ) (0.81 ) (23.82 ) Additional information: Incremental "in-the-money" options, warrants and restricted stock awards and units at the end of the period (D) 3,476,437 15,513,573 183 Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through (In thousands, except share and per share data) September 30, 2018 September 30, 2017 July 31, 2017 Net loss available to common shareholders $ (81,008 ) (15,693 ) (1,741,763 ) Weighted average outstanding shares of common stock, basic (A) 25,073,284 19,389,031 47,104,117 Dilutive effect of options, warrants and restricted stock awards and units — — — Weighted average shares of common stock and equivalents 25,073,284 19,389,031 47,104,117 Loss per share, basic (B) $ (3.23 ) (0.81 ) (36.98 ) Loss per share, diluted (C) $ (3.23 ) (0.81 ) (36.98 ) Additional information: Incremental "in-the-money" options, warrants and restricted stock awards and units at the end of the period (D) 5,143,206 15,513,573 183 (A) Common shares and New Creditor Warrants and the sum of common shares and New Creditor Warrants outstanding at September 30, 2018, were 26,815,991, 3,512,416 and 30,328,407, respectively. (B) The company calculates “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding shares of common stock, basic”. (C) The company calculates “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average common stock and equivalents ”. (D) For the nine months ended September 30, 2018, the company also had 5,062,089 shares of “out-of- the-money” warrants outstanding at the end of the period.

RELATED PARTY BALANCES

RELATED PARTY BALANCES	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
RELATED PARTY BALANCES	(9) RELATED PARTY BALANCES The company maintained the following balances with related parties as of September 30, 2018 and December 31, 2017: Successor September 30, December 31, (In thousands) 2018 2017 Due from related parties: Sonatide (Angola) $ 133,277 230,315 DTDW (Nigeria) 41,072 33,353 Due to related parties: Sonatide (Angola) $ 30,765 99,448 DTDW (Nigeria) 17,299 9,645 Due from related parties, net of due to related parties $ 126,285 154,575 Included in due from related parties balances are customer receivables expected to be remitted to the company through joint ventures, receivables related to operating expenses paid by the company on behalf of joint ventures and cash received by joint ventures from customers and due to the company. Included in the due to related parties balances are commissions payable by the company to the related parties and payables related to local expenses paid by the related parties on behalf of the company. For more information regarding amounts due to and from Sonatide please refer to Note (10). Amounts due from and due to DTDW (Nigeria) of $33.4 million and $9.6 million, respectively, are included in trade and other receivables, net, and accounts payable line items at December 31, 2017.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	(10) COMMITMENTS AND CONTINGENCIES Sonatide Joint Venture The company has previously disclosed the significant financial and operational challenges that it confronts with respect to its operations in Angola, as well as steps that the company has taken to address or mitigate those risks. Most of the company’s attention has been focused in three areas: (i) reducing the net receivable balance due to the company from Sonatide, its Angolan joint venture with Sonangol, for vessel services; (ii) reducing the foreign currency risk created by virtue of provisions of Angolan law that require that payment for a significant portion of the services provided by Sonatide be paid in Angolan kwanza; and (iii) optimizing opportunities, consistent with Angolan law, for services provided by the company to be paid for directly in U.S. dollars. These challenges, and the company’s efforts to respond, continue. Amounts due from Sonatide (Due from affiliates in the consolidated balance sheets) at September 30, 2018 and December 31, 2017, of approximately $134 million and $230 million, respectively, represent cash received by Sonatide from customers and due to the company, amounts due from customers that are expected to be remitted to the company through Sonatide and costs incurred by the company on behalf of Sonatide. Approximately $23 million of the balance at September 30, 2018, represents invoiced but unpaid vessel revenue related to services performed by the company through the Sonatide joint venture. Remaining amounts due to the company from Sonatide are, in part, supported by approximately $67 million of cash held by Sonatide, of which the equivalent of approximately $36 million is denominated in Angolan kwanza, pending conversion into U.S. dollars and subsequent expatriation. In addition, the company owes Sonatide the aggregate sum of approximately $31 million, including approximately $26 million in commissions payable by the company to Sonatide. For the nine months ended September 30, 2018, the company collected (primarily through Sonatide) approximately $69 million from its Angolan operations. Of the $69 million collected, approximately $61 million were U.S. dollars received by Sonatide on behalf of the company or U.S. dollars received directly by the company from customers. The balance of approximately $8 million collected reflects Sonatide’s conversion of Angolan kwanza into U.S. dollars and the subsequent expatriation of the dollars and payment to the company. The company also reduced the respective due from affiliates and due to affiliates balances by approximately $71 million during the nine months ended September 30, 2018 through netting transactions based on an agreement with the joint venture. Amounts due to Sonatide (Due to affiliates in the consolidated balance sheets) at September 30, 2018 and December 31, 2017, of approximately $31 million and $99 million, respectively, represents amounts due to Sonatide for commissions payable and other costs paid by Sonatide on behalf of the company. The company monitors the aggregate amounts due from Sonatide relative to the amounts due to Sonatide. The company believes that the process for converting Angolan kwanza continues to function, but the relative scarcity of EUROs and U.S. dollars in Angola continues to hinder the conversion process. Sonatide continues to press the commercial banks with which it has relationships to increase the amount of EUROs and U.S. dollars that are made available to Sonatide. For the nine month period ended September 30, 2018, the company’s Angolan operations generated vessel revenues of approximately $44 million, or 15%, of its consolidated vessel revenue, from an average of approximately 38 company-owned vessels that are marketed through the Sonatide joint venture (16 of which were stacked on average during the nine months ended September 30, 2018). For the period from August 1, 2017 through September 30, 2017, the company’s Angolan operations generated vessel revenues of approximately $14 million, or 20%, of its consolidated vessel revenue, from an average of approximately 44 company-owned vessels that are marketed through the Sonatide joint venture (16 of which were stacked on average during the period from August 1, 2017 through September 30, 2017). For the period from January 1, 2017 through July 31, 2017, the company’s Angolan operations generated vessel revenues of approximately $60 million, or 20%, of its consolidated vessel revenue, from an average of approximately 52 company-owned vessels that are marketed through the Sonatide joint venture (22 of which were stacked on average during the period from January 1, 2017 through July 31, 2017). In addition to vessels that Sonatide charters from the company, Sonatide owns four vessels (two of which are currently stacked) and certain other assets, in addition to earning commission from company-owned vessels marketed through the Sonatide joint venture (owned 49% by the company). As of September 30, 2018 and December 31, 2017, the carrying value of the company’s investment in the Sonatide joint venture, which is included in “Investments in, at equity, and advances to unconsolidated companies,” was $0 and approximately $27 million, respectively. During the nine months ended September 30, 2018, the exchange rate of the Angolan kwanza versus the U.S. dollar was devalued from a ratio of approximately 168 to 1 to a ratio of approximately 294 to 1, or approximately 75%. Also during the nine months ended September 30, 2018, the company received a dividend from Sonatide of approximately $12 million which reduced the carrying value of the company’s investment in Sonatide to zero. Approximately $5 million of dividends received in excess of the investment balance was recognized in earnings during the nine months ended September 30, 2018. Management continues to explore ways to profitably participate in the Angolan market while evaluating opportunities to reduce the overall level of exposure to the increased risks that the company believes characterize the Angolan market. Included among mitigating measures taken by the company to address these risks is the redeployment of vessels from time to time to other markets. Redeployment of vessels to and from Angola since September 30, 2017 Company-owned vessels operating in Angola decreased by 45 vessels, from September 30, 2014 to September 30, 2018 (from 81 vessels to 36 vessels). Company-owned active vessels decreased in the same period by 55 vessels (from 76 vessels to 21 vessels) . Brazilian Customs In April 2011, two Brazilian subsidiaries of the company were company The company is vigorously contesting these fines (which it has neither paid nor accrued ). As a result of the administrative appeals process, the company has been successful in reducing the total remaining assessment, including potential interest, to less than 10 million reais (less than $2.5 million as of September 30, 2018). Based court actions that have been commenced are still in their initial stages. Repairs to U.S. Flagged Vessels Operating Abroad During fiscal 2015 the company became aware that it may have had compliance deficiencies in documenting and declaring upon re-entry to the U.S. certain foreign purchases for or repairs to U.S. flagged vessels while they were working outside of the U.S. When a U.S. flagged vessel operates abroad, certain foreign purchases for or repairs made to the U.S. flagged vessel while it is outside of the U.S. are subject to declaration with U.S. Customs and Border Protection (CBP) upon re-entry to the U.S. and are subject to 50% vessel repair duty. During an examination of the company’s filings made in or prior to fiscal 2015 with CBP, the company determined that it was necessary to file amended forms with CBP to supplement previous filings. The company has amended several vessel repair entries with CBP and has paid additional vessel repair duties and interest associated with these amended forms. In connection with five of the company’s amended filings, CBP assessed penalties, which the company paid after CBP granted mitigation and reduced the amount of each civil penalty. The amount paid in civil penalties was not material. It is possible that CBP may seek to impose further civil penalties or fines in connection with some or all of the other amended filings that could be material. Currency Devaluation and Fluctuation Risk Due to the company’s international operations, the company is exposed to foreign currency exchange rate fluctuations and exchange rate risks on all charter hire contracts denominated in foreign currencies. For some of the company’s international contracts, a portion of the revenue and local expenses are incurred in local currencies with the result that the company is at risk of changes in the exchange rates between the U.S. dollar and foreign currencies. We generally do not hedge against any foreign currency rate fluctuations associated with foreign currency contracts that arise in the normal course of business, which exposes us to the risk of exchange rate losses. To minimize the financial impact of these items, the company attempts to contract a significant majority of its services in U.S. dollars. In addition, the company attempts to minimize the financial impact of these risks by matching the currency of the company’s operating costs with the currency of the revenue streams when considered appropriate. The company continually monitors the currency exchange risks associated with all contracts not denominated in U.S. dollars. For more information regarding the reduction in the company’s investment balance as a result of currency devaluation, please refer to the section entitled Sonatide Joint Venture. Legal Proceedings Arbitral Award for the Taking of the Company’s Venezuelan Operations Committees formed under the rules of the World Bank’s International Centre for Settlement of Investment Disputes (“ICSID”) have awarded two subsidiaries of the company compensation for the expropriation of the investments of the two subsidiaries by the Bolivarian Republic of Venezuela. The nature of the investments expropriated and the progress of the ICSID proceeding were previously reported by the company in prior filings. The final aggregate award is $57.5 million as of September 30, 2018, and accrues interest at approximately $0.6 million per quarter. The committees’ decisions are not subject to any further ICSID review, appeal or other substantive proceeding or any stay of enforcement. The company is committed to taking appropriate steps to enforce and collect the award, which is enforceable in any of the 150 member states that are party to the ICSID Convention. As an initial step, the company had the award recognized and entered as a judgment by the United States District Court for the Southern District of New York. A recent federal court of appeals decision resulted in that judgment being vacated for reasons related to service of process. The company has initiated a separate court action in the United States District Court for the District of Columbia using a different service of process method and expects to be successful in having the award recognized in the District of Columbia court. In addition, the award has been recognized and entered in November 2016 as a final judgment of the High Court of Justice of England and Wales. Even with the likely eventual recognition of the award in the United States and the current recognition by the court in the United Kingdom, the company recognizes that collection of the award presents significant practical challenges. The company is accounting for this matter as a gain contingency, and will record any such gain in future periods if and when the contingency is resolved, in accordance with ASC 450 Contingencies . Other Various other legal proceedings and claims are outstanding which arose in the ordinary course of business. In the opinion of management, the amount of ultimate liability, if any, with respect to these actions, will not have a material adverse effect on the company's financial position, results of operations, or cash flows.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	(11) FAIR VALUE MEASUREMENTS Assets and Liabilities Measured at Fair Value on a Recurring Basis The company’s supplemental plan assets are accounted for at fair value and are classified within the fair value hierarchy based on the lowest level of input that is significant to the fair value measurement, with the exception of investments for which fair value is measured using the net asset value (NAV) per share expedient. The following table provides the fair value hierarchy for the supplemental plan assets measured at fair value as of September 30, 2018 (Successor): Significant Significant Quoted prices in observable unobservable Measured at active markets inputs inputs Net Asset (In thousands) Total (Level 1) (Level 2) (Level 3) Value Cash and cash equivalents $ 38 — — — 38 Total fair value of plan assets $ 38 — — — 38 The following table provides the fair value hierarchy for the supplemental plan assets measured at fair value as of December 31, 2017 (Successor): Significant Significant Quoted prices in observable unobservable Measured at active markets inputs inputs Net Asset (In thousands) Total (Level 1) (Level 2) (Level 3) Value Equity securities $ 5,295 5,295 — — — Debt securities 3,368 851 841 — 1,676 Cash and cash equivalents 246 27 170 — 49 Total $ 8,909 6,173 1,011 — 1,725 Other pending transactions (1 ) (1 ) — — — Total fair value of plan assets $ 8,908 6,172 1,011 — 1,725 Other Financial Instruments The company’s primary financial instruments consist of cash, cash equivalents and restricted cash, trade receivables and trade payables with book values that are considered to be representative of their respective fair values. The company periodically utilizes derivative financial instruments to hedge against foreign currency denominated assets and liabilities, currency commitments, or to lock in desired interest rates. These transactions are generally spot or forward currency contracts or interest rate swaps that are entered into with major financial institutions. Derivative financial instruments are intended to reduce the company’s exposure to foreign currency exchange risk and interest rate risk. The company enters into derivative instruments only to the extent considered necessary to address its risk management objectives and does not use derivative contracts for speculative purposes. The derivative instruments are recorded at fair value using quoted prices and quotes obtainable from the counterparties to the derivative instruments. Cash Equivalents . The company’s cash equivalents, which are securities with maturities less than 90 days, are held in deposit accounts with highly rated financial institutions. The carrying value for cash equivalents is considered to be representative of its fair value due to the short duration and conservative nature of the cash equivalent investment portfolio. Spot Derivatives . Spot derivative financial instruments are short-term in nature and generally settle within two business days. The fair value of spot derivatives approximates the carrying value due to the short-term nature of this instrument, and as a result, no gains or losses are recognized. The following table provides the fair value hierarchy for the company’s other financial instruments measured as of September 30, 2018 (Successor): Significant Significant Quoted prices in observable unobservable active markets inputs inputs (In thousands) Total (Level 1) (Level 2) (Level 3) Cash equivalents $ 420,733 420,733 — — Total fair value of assets $ 420,733 420,733 — — The following table provides the fair value hierarchy for the company’s other financial instruments measured as of December 31, 2017 (Successor): Significant Significant Quoted prices in observable unobservable active markets inputs inputs (In thousands) Total (Level 1) (Level 2) (Level 3) Cash equivalents $ 399,322 399,322 — — Total fair value of assets $ 399,322 399,322 — — For disclosures related to assets and liabilities measured at fair value on a nonrecurring basis refer to Note (14).

OTHER CURRENT ASSETS, PROPERTIE

OTHER CURRENT ASSETS, PROPERTIES AND EQUIPMENT, OTHER ASSETS, ACCRUED EXPENSES, OTHER CURRENT LIABILITIES AND OTHER LIABILITIES AND DEFERRED CREDITS	9 Months Ended
	Sep. 30, 2018
Other Current Assets Properties And Equipment Other Assets Accrued Expenses Other Current Liabilities And Other Non Current Liabilities And Deferred Credits [Abstract]
OTHER CURRENT ASSETS, PROPERTIES AND EQUIPMENT, OTHER ASSETS, ACCRUED EXPENSES, OTHER CURRENT LIABILITIES AND OTHER LIABILITIES AND DEFERRED CREDITS	(12) OTHER CURRENT ASSETS, PROPERTIES AND EQUIPMENT, OTHER ASSETS, ACCRUED EXPENSES, OTHER CURRENT LIABILITIES AND OTHER LIABILITIES A summary of other current assets at September 30, 2018 and December 31, 2017 is as follows: Successor September 30, December 31, (In thousands) 2018 2017 Deposits $ 1,403 1,780 Investments held in rabbi trust (A) 38 8,908 Prepaid expenses 8,439 8,442 $ 9,880 19,130 (A) The company converted substantially all investments held in the rabbi trust to cash to fund a lump sum benefit to the former CEO in May 2018. Refer to Note (6) for more information regarding this payment. A summary of net properties and equipment at September 30, 2018 and December 31, 2017 is as follows: Successor September 30, December 31, (In thousands) 2018 2017 Properties and equipment: Vessels and related equipment $ 817,798 850,268 Other properties and equipment 5,450 5,710 823,248 855,978 Less accumulated depreciation and amortization 46,608 18,458 Net properties and equipment $ 776,640 837,520 A summary of other assets at September 30, 2018 and December 31, 2017 is as follows: Successor September 30, December 31, (In thousands) 2018 2017 Recoverable insurance losses $ 4,056 2,405 Investments held for supplemental savings plan accounts 5,448 6,583 Long-term deposits 14,176 16,217 Other 5,020 5,847 $ 28,700 31,052 A summary of accrued expenses at September 30, 2018 and December 31, 2017 is as follows: Successor September 30, December 31, (In thousands) 2018 2017 Payroll and related payables (B) $ 9,539 17,344 Commissions payable (C) 1,932 1,898 Accrued vessel expenses 24,628 27,222 Accrued interest expense 5,935 6,036 Other accrued expenses 4,026 2,306 $ 46,060 54,806 (B) The balance at December 31, 2017 includes $8.9 million payable to the former CEO, which was paid in May 2018. (C) Excludes $26.2 million and $36.4 million of commissions due to Sonatide at September 30, 2018 and December 31, 2017, respectively. These amounts are included in amounts due to affiliates. A summary of other current liabilities at September 30, 2018 and December 31, 2017 is as follows: Successor September 30, December 31, (In thousands) 2018 2017 Taxes payable $ 16,308 10,326 Amounts payable to holders of General Unsecured Claims — 8,474 Other 2,586 893 $ 18,894 19,693 A summary of other liabilities at September 30, 2018 and December 31, 2017 is as follows: Successor September 30, December 31, (In thousands) 2018 2017 Postretirement benefits liability $ 2,350 2,642 Pension liabilities 36,367 36,614 Deferred supplemental savings plan liability 5,450 6,592 Other 9,614 12,728 $ 53,781 58,576

SEGMENT AND GEOGRAPHIC DISTRIBU

SEGMENT AND GEOGRAPHIC DISTRIBUTION OF OPERATIONS	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
SEGMENT AND GEOGRAPHIC DISTRIBUTION OF OPERATIONS	(13) SEGMENT AND GEOGRAPHIC DISTRIBUTION OF OPERATIONS During the quarter ended March 31, 2018, the company’s Africa/Europe segment was split as a result of management realignment such that the company’s operations in Europe and Mediterranean Sea regions and the company’s West African regions are now separately reported segments. As such, the company now discloses these new segments as Europe/Mediterranean Sea and West Africa, respectively. The company’s Americas and Middle East/Asia Pacific segments are not affected by this change. This new segment alignment is consistent with how the company’s chief operating decision maker reviews operating results for the purposes of allocating resources and assessing performance. Prior year amounts have been recast to conform to the new segment alignment. The following tables provide a comparison of segment revenues, vessel operating profit (loss), depreciation and amortization, and additions to properties and equipment. Vessel revenues and operating costs relate to vessels owned and operated by the company while other operating revenues relate to brokered vessels and other miscellaneous marine-related businesses. Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Revenues: Vessel revenues: Americas $ 28,039 17,449 8,961 Middle East/Asia Pacific 19,927 16,669 8,547 Europe/Mediterranean Sea 12,566 8,860 4,435 West Africa 36,479 27,593 12,397 97,011 70,571 34,340 Other operating revenues (A) 2,181 3,729 1,923 $ 99,192 74,300 36,263 Vessel operating profit (loss): Americas $ 1,212 (2,651 ) (6,850 ) Middle East/Asia Pacific (701 ) 944 (118 ) Europe/Mediterranean Sea (2,056 ) (711 ) (2,517 ) West Africa 3,912 687 (6,054 ) 2,367 (1,731 ) (15,539 ) Other operating profit 485 809 821 2,852 (922 ) (14,718 ) Corporate general and administrative expenses (B) (9,415 ) (4,797 ) (2,840 ) Corporate depreciation (99 ) (67 ) (163 ) Corporate expenses (9,514 ) (4,864 ) (3,003 ) Gain (loss) on asset dispositions, net (1,571 ) 4 372 Asset impairments (C) (16,853 ) — (21,325 ) Operating loss $ (25,086 ) (5,782 ) (38,674 ) Foreign exchange gain (loss) 1 (58 ) (2,024 ) Equity in net earnings (losses) of unconsolidated companies 56 1,305 269 Interest income and other, net 2,709 873 704 Reorganization items — (1,880 ) (1,083,729 ) Interest and other debt costs, net (7,585 ) (5,240 ) (574 ) Loss before income taxes $ (29,905 ) (10,782 ) (1,124,028 ) Depreciation and amortization: Americas $ 3,858 2,295 3,197 Middle East/Asia Pacific 2,939 1,807 2,221 Europe/Mediterranean Sea 2,313 1,154 2,257 West Africa 4,176 2,407 3,037 13,286 7,663 10,712 Other 5 412 285 Corporate 99 67 163 $ 13,390 8,142 11,160 Additions to properties and equipment: Americas $ 564 — — Middle East/Asia Pacific 568 377 394 Europe/Mediterranean Sea — — — West Africa 54 159 101 1,186 536 495 Corporate (D) 2,155 53 143 $ 3,341 589 638 (A) Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from July 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $0.4 million, respectively of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017. (B) Included in corporate general and administrative expenses for the three month p eriod ended September 30, 2018 (Successor), are (C) Refer to Note (14) for additional information regarding asset impairment. (D) Included in Corporate are additions to properties and equipment relating to a vessel under construction which has not been assigned to a non-corporate reporting segment as of the date presented. Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Revenues: Vessel revenues: Americas $ 86,721 17,449 121,380 Middle East/Asia Pacific 60,721 16,669 62,991 Europe/Mediterranean Sea 35,546 8,860 25,631 West Africa 105,691 27,593 93,499 288,679 70,571 303,501 Other operating revenues (A) 7,607 3,729 8,617 $ 296,286 74,300 312,118 Vessel operating profit (loss): Americas $ 11,804 (2,651 ) 8,069 Middle East/Asia Pacific (2,329 ) 944 (7,597 ) Europe/Mediterranean Sea (6,753 ) (711 ) (19,783 ) West Africa 3,867 687 (14,180 ) 6,589 (1,731 ) (33,491 ) Other operating profit 2,767 809 651 9,356 (922 ) (32,840 ) Corporate general and administrative expenses (B) (23,909 ) (4,797 ) (39,299 ) Corporate depreciation (299 ) (67 ) (1,268 ) Corporate expenses (24,208 ) (4,864 ) (40,567 ) Gain on asset dispositions, net 1,686 4 9,625 Asset impairments (C) (24,254 ) — (249,606 ) Operating loss $ (37,420 ) (5,782 ) (313,388 ) Foreign exchange loss (1,349 ) (58 ) (2,516 ) Equity in net earnings (losses) of unconsolidated companies (14,993 ) 1,305 7,627 Interest income and other, net 5,495 873 3,974 Reorganization items — (1,880 ) (1,396,905 ) Interest and other debt costs, net (22,731 ) (5,240 ) (32,188 ) Loss before income taxes $ (70,998 ) (10,782 ) (1,733,396 ) Depreciation and amortization: Americas $ 10,700 2,295 25,242 Middle East/Asia Pacific 8,552 1,807 18,466 Europe/Mediterranean Sea 6,356 1,154 15,621 West Africa 12,269 2,407 22,447 37,877 7,663 81,776 Other 16 412 1,995 Corporate 299 67 1,268 $ 38,192 8,142 85,039 Additions to properties and equipment: Americas $ 2,831 — 27 Middle East/Asia Pacific 2,064 377 2,067 Europe/Mediterranean Sea 134 — — West Africa 35 159 469 5,064 536 2,563 Corporate (D) 4,052 53 7,775 $ 9,116 589 10,338 (A) Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from January 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $1.1 million, respectively of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017. (B) Included in corporate general and administrative expenses for the period from January 1, 2017 through July 31, 2017 (Predecessor), are r eriod ended September 30, 2018 (Successor), are (C) Refer to Note (14) for additional information regarding asset impairment. (D) Included in Corporate are additions to properties and equipment relating to a vessel under construction which has not yet been assigned to a non-corporate reporting segment as of the dates presented. The following table provides a comparison of total assets at September 30, 2018 and December 31, 2017: September 30, December 31, (In thousands) 2018 2017 Total assets (A): Americas (B) $ 319,487 164,958 Middle East/Asia Pacific 203,320 48,268 Europe/Mediterranean Sea 153,877 171,157 West Africa (C) 458,327 864,299 1,135,011 1,248,682 Other — 2,443 1,135,011 1,251,125 Investments in, at equity, and advances to unconsolidated companies 1,129 29,216 1,136,140 1,280,341 Corporate (D) 454,769 465,839 $ 1,590,909 1,746,180 (A) The company’s segment level assets as of September 30, 2018, reflect the elimination of certain intersegment balances. (B) Americas segment assets include cash held by non-corporate subsidiaries of $100.3 million and $95.1 million, as of September 30, 2018 and December 31, 2017, respectively. (C) West Africa segment assets include due from related parties of $174.3 million and $263.7 million as of September 30, 2018 and December 31, 2017, respectively. (D) Corporate includes cash (including restricted cash) of $350.2 million and $336.4 million as of September 30, 2018 and December 31, 2017, respectively. Also included in Corporate at December 31, 2017 is a vessel under construction which has not yet been assigned to a non-corporate reporting segment. A vessel’s construction costs are reported in Corporate until the earlier of the date the vessel is assigned to a non-corporate reporting segment or the date it is delivered. At December 31, 2017, The following tables compare revenue by segment, and in total for the worldwide fleet, along with the respective percentage of total vessel revenue: Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through September 30, 2018 September 30, 2017 July 31, 2017 Vessel revenue by vessel class (In thousands) % of Vessel Revenue % of Vessel Revenue % of Vessel Revenue Americas fleet: Deepwater $ 19,513 20 % $ 9,798 14 % 4,304 12 % Towing-supply 6,417 7 % 5,572 8 % 3,747 11 % Other 2,109 2 % 2,079 3 % 910 3 % Total $ 28,039 29 % $ 17,449 25 % 8,961 26 % Middle East/Asia Pacific fleet: Deepwater $ 7,607 8 % $ 5,726 8 % 2,667 8 % Towing-supply 12,156 12 % 10,943 16 % 5,880 17 % Other 164 <1 % — — — — Total $ 19,927 20 % $ 16,669 24 % 8,547 25 % Europe/Mediterranean Sea fleet: Deepwater $ 11,643 12 % $ 7,810 11 % 3,383 10 % Towing-supply 923 1 % 1,050 1 % 1,052 3 % Other — — — — — — Total $ 12,566 13 % $ 8,860 12 % $ 4,435 13 % West Africa fleet: Deepwater $ 15,101 16 % $ 9,772 14 % 4,205 12 % Towing-supply 17,805 18 % 13,999 20 % 7,072 21 % Other 3,573 4 % 3,822 5 % 1,120 3 % Total $ 36,479 38 % $ 27,593 39 % $ 12,397 36 % Worldwide fleet: Deepwater $ 53,864 56 % $ 33,106 47 % 14,559 42 % Towing-supply 37,301 38 % 31,564 45 % 17,751 52 % Other 5,846 6 % 5,901 8 % 2,030 6 % Total $ 97,011 100 % $ 70,571 100 % 34,340 100 % Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through September 30, 2018 September 30, 2017 July 31, 2017 Vessel revenue by vessel class (In thousands) % of Vessel Revenue % of Vessel Revenue % of Vessel Revenue Americas fleet: Deepwater (A) $ 58,379 20 % $ 9,798 14 % 84,448 28 % Towing-supply 20,824 7 % 5,572 8 % 29,759 10 % Other 7,518 3 % 2,079 3 % 7,173 2 % Total $ 86,721 30 % $ 17,449 25 % 121,380 40 % Middle East/Asia Pacific fleet: Deepwater $ 26,774 9 % $ 5,726 8 % 22,801 8 % Towing-supply 33,762 12 % 10,943 16 % 40,190 13 % Other 185 <1 % — — — — Total $ 60,721 21 % $ 16,669 24 % 62,991 21 % Europe/Mediterranean Sea fleet: Deepwater $ 33,260 11 % $ 7,810 11 % 21,473 7 % Towing-supply 2,286 1 % 1,050 1 % 4,167 1 % Other — — — — (9 ) (<1 %) Total $ 35,546 12 % $ 8,860 12 % 25,631 8 % West Africa fleet: Deepwater $ 43,354 15 % $ 9,772 14 % 31,306 10 % Towing-supply 51,265 18 % 13,999 20 % 53,769 18 % Other 11,072 4 % 3,822 5 % 8,424 3 % Total $ 105,691 37 % $ 27,593 39 % 93,499 31 % Worldwide fleet: Deepwater (A) $ 161,767 55 % $ 33,106 47 % 160,028 53 % Towing-supply 108,137 38 % 31,564 45 % 127,885 42 % Other 18,775 7 % 5,901 8 % 15,588 5 % Total (A) $ 288,679 100 % $ 70,571 100 % 303,501 100 % (A) Included in Americas fleet deepwater, Worldwide fleet deepwater and Worldwide total vessel revenues for the period January 1, 2017 through July 31, 2017 (Predecessor), is $39.1 million of revenue related to the early cancellation of a long-term vessel charter contract.

ASSET IMPAIRMENTS

ASSET IMPAIRMENTS	9 Months Ended
	Sep. 30, 2018
Asset Impairment Charges [Abstract]
ASSET IMPAIRMENTS	(14) ASSET IMPAIRMENTS Management estimates the fair value of each vessel not expected to return to active service (considered Level 3, as defined by ASC 820, Fair Value Measurements and Disclosures) by considering items such as the vessel’s age, length of time stacked, likelihood of a return to active service and actual recent sales of similar vessels, among others. For vessels with more significant carrying values, we obtain an estimate of the fair value of the stacked vessel from third-party appraisers or brokers for use in our determination of fair value estimates. Stacked vessels expected to return to active service are generally newer vessels, have similar capabilities and likelihood of future active service as other currently operating vessels, are generally current with classification societies in regards to their regulatory certification status, and are being actively marketed. Stacked vessels expected to return to service are evaluated for impairment as part of their assigned active asset group and not individually. The company reviews the vessels in its active fleet for impairment whenever events occur or changes in circumstances indicate that the carrying amount of an asset group may not be recoverable. In such evaluation, the estimated future undiscounted cash flows generated by an asset group are compared with the carrying amount of the asset group to determine if a write-down may be required. If an asset group fails the undiscounted cash flow test, the company estimates the fair value of each asset group and compares such estimated fair value, considered Level 3, as defined by ASC 820, Fair Value Measurements and Disclosures, to the carrying value of each asset group in order to determine if impairment exists. Similar to stacked vessels, management obtains estimates of the fair values of the active vessels from third party appraisers or brokers for use in determining fair value estimates. The below tables summarize the number of vessels impaired and the amount of the impairment incurred. Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through (In thousands, except number of vessels impaired) September 30, 2018 September 30, 2017 July 31, 2017 Number of vessels impaired in the period (A) 15 — 8 Amount of impairment incurred $ 16,853 — 21,325 (A) For the three month period ended September 30, 2018, (Successor) there were 15 stacked vessels impaired. For the period July 1 through July 31, 2017 there were seven stacked vessels and one active vessel impaired. Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through (In thousands, except number of vessels impaired) September 30, 2018 September 30, 2017 July 31, 2017 Number of vessels impaired in the period (A) 30 — 97 Amount of impairment incurred $ 24,254 — 249,606 (A) For the nine month period ended September 30, 2018, (Successor) there were 30 stacked vessels impaired. For the period January 1 through July 31, 2017 there were 90 stacked vessels and seven active vessels impaired.

GULFMARK MERGER

GULFMARK MERGER	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
GULFMARK MERGER	(15) GULFMARK MERGER On July 15, 2018, the company and GulfMark Offshore, Inc. (“GulfMark”) entered into a definitive merger agreement to combine the two companies. Under the terms of the agreement, GulfMark stockholders will receive 1.1 shares of company common stock for each share of GulfMark common stock. Each GulfMark noteholder warrant will be automatically converted into the right to receive 1.1 company shares, subject to Jones Act restrictions on maximum ownership of shares by non-U.S. citizens. The company will assume GulfMark's obligations under existing GulfMark equity warrants. Upon completion of the proposed merger, the company’s and GulfMark’s stockholders will own approximately 74 percent and 26 percent, respectively, of the combined company. The proposed merger is expected to close in the fourth quarter of 2018, subject to regulatory and other customary closing conditions, including approval from the stockholders of the company and GulfMark. If the merger agreement is terminated under certain circumstances, the company may be obligated to pay GulfMark a termination fee of $35.0 million, and GulfMark may be obligated to pay the company a termination fee of $13.0 million.

INTERIM FINANCIAL STATEMENTS (P

INTERIM FINANCIAL STATEMENTS (Policies)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Reorganization and Fresh Start Accounting	Reorganization and Fresh Start Accounting References to "Successor" or "Successor Company" relate to the financial position and results of operations of the reorganized company subsequent to July 31, 2017. References to "Predecessor" or "Predecessor Company" relate to the financial position and results of operations of the company through July 31, 2017. On Ju ly 31, 2017, the company and certain of its subsidiaries that had been named as additional debtors in the Chapter 11 proceedings emerged Upon the company's emergence from Chapter 11 bankruptcy, the company qualified for and adopted fresh-start accounting in accordance with the provisions set forth in ASC 852, which requires the company to present its assets, liabilities, and equity as if it were a new entity upon emergence from bankruptcy. The implementation of the Plan and the application of fresh-start accounting materially changed the carrying amounts and classifications reported in the company’s consolidated financial statements and resulted in the company becoming a new entity for financial reporting purposes. As a result of the application of fresh-start accounting and the effects of the implementation of the Plan, the financial statements after July 31, 2017 are not comparable with the financial statements prior to July 31, 2017. Therefore, "black-line" financial statements are presented to distinguish between the Predecessor and Successor companies.

REVENUE RECOGNITION (Tables)

REVENUE RECOGNITION (Tables)	9 Months Ended
	Sep. 30, 2018
Revenue From Contract With Customer [Abstract]
Schedule of Segment Reporting Information, Revenue by Vessel	The following tables disclose the amount of revenue by segment and in total for the worldwide fleet: Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Vessel revenues: Americas $ 28,039 17,449 8,961 Middle East/Asia Pacific 19,927 16,669 8,547 Europe/Mediterranean Sea 12,566 8,860 4,435 West Africa 36,479 27,593 12,397 97,011 70,571 34,340 Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Vessel revenues: Americas (A) $ 86,721 17,449 121,380 Middle East/Asia Pacific 60,721 16,669 62,991 Europe/Mediterranean Sea 35,546 8,860 25,631 West Africa 105,691 27,593 93,499 288,679 70,571 303,501 (A) Included in Americas and total vessel revenues for the period January 1, 2017 through July 31, 2017 (Predecessor), is $39.1 million of revenue related to the early cancellation of a long-term vessel charter contract.
Summarizes The Revenue Expected to be Recognized in Future Related to Unsatisfied Performance Obligations	The table below summarizes the revenue expected to be recognized in future quarters related to unsatisfied performance obligations as of September 30, 2018: (In thousands) December 31, 2018 Total Contract liabilities/deferred revenue $ 552 552

STOCKHOLDERS' EQUITY (Tables)

STOCKHOLDERS' EQUITY (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax	The changes in accumulated other comprehensive income (loss) by component, net of tax, are as follows: Successor Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 Balance Gains/(losses) Reclasses Net Remaining Balance Gains/(losses) Reclasses Net Remaining at recognized from period balance at recognized from period balance (in thousands) 6/30/18 in OCI net income OCI 9/30/18 12/31/17 in OCI net income OCI 9/30/18 Available for sale securities — — — — — 256 (660 ) 404 (256 ) — Pension/Post- retirement benefits (403 ) — — — (403 ) (403 ) — — — (403 ) Total (403 ) — — — (403 ) (147 ) (660 ) 404 (256 ) (403 ) Predecessor Successor Period from July 1, 2017 through July 31, 2017 Period from August 1, 2017 through September 30, 2017 Balance Gains/(losses) Reclasses Net Remaining Balance Gains/(losses) Reclasses Net Remaining at recognized from period balance at recognized from period balance (in thousands) 6/30/17 in OCI net income OCI 7/31/17 7/30/17 in OCI net income OCI 9/30/17 Available for sale securities (9 ) 51 26 77 68 — 7 75 82 82 Currency translation adjustment (9,811 ) — — — (9,811 ) — — — — — Pension/Post- retirement benefits (438 ) (2,598 ) — (2,598 ) (3,036 ) — — — — — Total (10,258 ) (2,547 ) 26 (2,521 ) (12,779 ) — 7 75 82 82 Predecessor Successor Period from January 1, 2017 through July 31, 2017 Period from August 1, 2017 through September 30, 2017 Balance Gains/(losses) Reclasses Net Remaining Balance Gains/(losses) Reclasses Net Remaining at recognized from period balance at recognized from period balance (in thousands) 12/31/16 in OCI net income OCI 7/31/17 7/31/17 in OCI net income OCI 9/30/17 Available for sale securities (1 ) (158 ) 227 69 68 — 7 75 82 82 Currency translation adjustment (9,811 ) — — — (9,811 ) — — — — — Pension/Post- retirement benefits 4,683 (7,719 ) — (7,719 ) (3,036 ) — — — — — Interest rate swap (1,317 ) — 1,317 1,317 — — — — — — Total (6,446 ) (7,877 ) 1,544 (6,333 ) (12,779 ) — 7 75 82 82
Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income	The following tables summarize the reclassifications from accumulated other comprehensive income (loss) to the condensed consolidated statement of income: Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through Affected line item in the (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 consolidated statements of income Realized gains on available for sale securities — 75 26 Interest income and other, net Total pre-tax amounts — 75 26 Tax effect — — — Total gains for the period, net of tax $ — 75 26 Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through Affected line item in the (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 consolidated statements of income Realized gains on available for sale securities $ 404 75 431 Interest income and other, net Interest rate swap — — 2,140 Interest and other debt costs Total pre-tax amounts 404 75 2,571 Tax effect — — 1,027 Total gains for the period, net of tax $ 404 75 1,544

INCOME TAXES (Tables)

INCOME TAXES (Tables)	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Schedule of Unrecognized Tax Benefits Which Would Lower Effective Tax Rate if Realized	Unrecognized tax benefits, which would lower the effective tax rate if realized at September 30, 2018, are as follows: September 30, (In thousands) 2018 Unrecognized tax benefit related to state tax issues $ 12,425 Interest receivable on unrecognized tax benefit related to state tax issues $ 60

EMPLOYEE BENEFIT PLANS (Tables)

EMPLOYEE BENEFIT PLANS (Tables)	9 Months Ended
	Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Schedule of Carrying Value of Trust Assets, Including Unrealized Gains or Losses	The following table summarizes the carrying value of the trust assets, including unrealized gains or losses at September 30, 2018 and December 31, 2017: Successor September 30, December 31, (In thousands) 2018 2017 Investments held in Rabbi Trust at fair value $ 38 8,908 Unrealized gains in fair value of trust assets — 256 Obligations under the supplemental plan 23,711 32,508
Schedule of Net Periodic Benefit Cost	The net periodic benefit cost for the company’s defined benefit pension plans and supplemental plan (referred to collectively as “Pension Benefits”) and the postretirement health care and life insurance plan (referred to collectively as “Other Benefits”) is comprised of the following components: Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Pension Benefits: Service cost $ 47 203 99 Interest cost 872 624 328 Expected return on plan assets (481 ) (332 ) (173 ) Administrative expenses 3 2 1 Payroll tax of net pension costs — — — Amortization of net actuarial losses — — — Recognized actuarial loss — — 187 Settlement loss recognized — — — Net periodic pension cost $ 441 497 442 Other Benefits: Service cost $ 15 12 6 Interest cost 29 30 16 Amortization of prior service cost (75 ) — (232 ) Recognized actuarial benefit 11 — (83 ) Net periodic postretirement (benefit) cost $ (20 ) 42 (293 ) Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Pension Benefits: Service cost $ 118 203 812 Interest cost 2,656 624 2,304 Expected return on plan assets (1,446 ) (332 ) (1,292 ) Administrative expenses 6 2 25 Payroll tax of net pension costs — — 56 Amortization of net actuarial losses — — 32 Recognized actuarial loss — — 1,195 Settlement loss recognized 335 — — Net periodic pension cost $ 1,669 497 3,132 Other Benefits: Service cost $ 45 12 44 Interest cost 88 30 115 Amortization of prior service cost (224 ) — (2,015 ) Recognized actuarial benefit 32 — (618 ) Net periodic postretirement (benefit) cost $ (59 ) 42 (2,474 )

INDEBTEDNESS (Tables)

INDEBTEDNESS (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Summary of Debt Outstanding	The following is a summary of all debt outstanding at September 30, 2018 and December 31, 2017: September 30, December 31, (In thousands) 2018 2017 Secured notes: 8.00% Secured notes due August 2022 (A) 349,954 350,000 Troms Offshore borrowings (B): NOK denominated notes due May 2024 13,593 14,054 NOK denominated notes due January 2026 24,545 25,965 USD denominated notes due January 2027 22,116 23,345 USD denominated notes due April 2027 24,810 25,463 $ 435,018 438,827 Debt premiums and discounts, net 7,954 9,333 Less: Current portion of long-term debt (7,671 ) (5,103 ) Total long-term debt $ 435,301 443,057 (A) As of September 30, 2018 and December 31, 2017, the fair value (Level 2) of the Secured Notes was $369.2 million and $359.8 million, respectively. (B) The company pays principal and interest on these notes semi-annually. As of September 30, 2018 and December 31, 2017, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $85.0 million and $88.5 million, respectively. The weighted average interest rate of the Troms Offshore borrowings as of September 30, 2018, was 5.01%.
Debt Costs	The following is a summary of interest and debt costs incurred, net of interest capitalized. Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Interest and debt costs incurred, net of interest capitalized $ 7,585 $ 5,240 574 Interest costs capitalized 153 — — Total interest and debt costs $ 7,738 $ 5,240 574 Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Interest and debt costs incurred, net of interest capitalized $ 22,731 $ 5,240 32,188 Interest costs capitalized 521 — 1,817 Total interest and debt costs $ 23,252 $ 5,240 34,005

LOSS PER SHARE (Tables)

LOSS PER SHARE (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Components of Basic and Diluted Loss Per Share	The components of basic and diluted loss per share are as follows: Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through (In thousands, except share and per share data) September 30, 2018 September 30, 2017 July 31, 2017 Net loss available to common shareholders $ (30,896 ) (15,693 ) (1,122,475 ) Weighted average outstanding shares of common stock, basic (A) 26,614,507 19,389,031 47,121,407 Dilutive effect of options, warrants and restricted stock awards and units — — — Weighted average shares of common stock and equivalents 26,614,507 19,389,031 47,121,407 Loss per share, basic (B) $ (1.16 ) (0.81 ) (23.82 ) Loss per share, diluted (C) $ (1.16 ) (0.81 ) (23.82 ) Additional information: Incremental "in-the-money" options, warrants and restricted stock awards and units at the end of the period (D) 3,476,437 15,513,573 183 Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through (In thousands, except share and per share data) September 30, 2018 September 30, 2017 July 31, 2017 Net loss available to common shareholders $ (81,008 ) (15,693 ) (1,741,763 ) Weighted average outstanding shares of common stock, basic (A) 25,073,284 19,389,031 47,104,117 Dilutive effect of options, warrants and restricted stock awards and units — — — Weighted average shares of common stock and equivalents 25,073,284 19,389,031 47,104,117 Loss per share, basic (B) $ (3.23 ) (0.81 ) (36.98 ) Loss per share, diluted (C) $ (3.23 ) (0.81 ) (36.98 ) Additional information: Incremental "in-the-money" options, warrants and restricted stock awards and units at the end of the period (D) 5,143,206 15,513,573 183 (A) Common shares and New Creditor Warrants and the sum of common shares and New Creditor Warrants outstanding at September 30, 2018, were 26,815,991, 3,512,416 and 30,328,407, respectively. (B) The company calculates “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding shares of common stock, basic”. (C) The company calculates “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average common stock and equivalents ”. (D) For the nine months ended September 30, 2018, the company also had 5,062,089 shares of “out-of- the-money” warrants outstanding at the end of the period.

RELATED PARTY BALANCES (Tables)

RELATED PARTY BALANCES (Tables)	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Schedule of Balances with Related Parties	The company maintained the following balances with related parties as of September 30, 2018 and December 31, 2017: Successor September 30, December 31, (In thousands) 2018 2017 Due from related parties: Sonatide (Angola) $ 133,277 230,315 DTDW (Nigeria) 41,072 33,353 Due to related parties: Sonatide (Angola) $ 30,765 99,448 DTDW (Nigeria) 17,299 9,645 Due from related parties, net of due to related parties $ 126,285 154,575

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis	The following table provides the fair value hierarchy for the supplemental plan assets measured at fair value as of September 30, 2018 (Successor): Significant Significant Quoted prices in observable unobservable Measured at active markets inputs inputs Net Asset (In thousands) Total (Level 1) (Level 2) (Level 3) Value Cash and cash equivalents $ 38 — — — 38 Total fair value of plan assets $ 38 — — — 38 The following table provides the fair value hierarchy for the supplemental plan assets measured at fair value as of December 31, 2017 (Successor): Significant Significant Quoted prices in observable unobservable Measured at active markets inputs inputs Net Asset (In thousands) Total (Level 1) (Level 2) (Level 3) Value Equity securities $ 5,295 5,295 — — — Debt securities 3,368 851 841 — 1,676 Cash and cash equivalents 246 27 170 — 49 Total $ 8,909 6,173 1,011 — 1,725 Other pending transactions (1 ) (1 ) — — — Total fair value of plan assets $ 8,908 6,172 1,011 — 1,725
Schedule of Fair Value Other Financial Instruments Measured	The following table provides the fair value hierarchy for the company’s other financial instruments measured as of September 30, 2018 (Successor): Significant Significant Quoted prices in observable unobservable active markets inputs inputs (In thousands) Total (Level 1) (Level 2) (Level 3) Cash equivalents $ 420,733 420,733 — — Total fair value of assets $ 420,733 420,733 — — The following table provides the fair value hierarchy for the company’s other financial instruments measured as of December 31, 2017 (Successor): Significant Significant Quoted prices in observable unobservable active markets inputs inputs (In thousands) Total (Level 1) (Level 2) (Level 3) Cash equivalents $ 399,322 399,322 — — Total fair value of assets $ 399,322 399,322 — —

OTHER CURRENT ASSETS, PROPERT_2

OTHER CURRENT ASSETS, PROPERTIES AND EQUIPMENT, OTHER ASSETS, ACCRUED EXPENSES, OTHER CURRENT LIABILITIES AND OTHER LIABILITIES AND DEFERRED CREDITS (Tables)	9 Months Ended
	Sep. 30, 2018
Other Current Assets Properties And Equipment Other Assets Accrued Expenses Other Current Liabilities And Other Non Current Liabilities And Deferred Credits [Abstract]
Schedule of Other Current Assets	A summary of other current assets at September 30, 2018 and December 31, 2017 is as follows: Successor September 30, December 31, (In thousands) 2018 2017 Deposits $ 1,403 1,780 Investments held in rabbi trust (A) 38 8,908 Prepaid expenses 8,439 8,442 $ 9,880 19,130 (A) The company converted substantially all investments held in the rabbi trust to cash to fund a lump sum benefit to the former CEO in May 2018. Refer to Note (6) for more information regarding this payment.
Summary of Net Properties and Equipment	A summary of net properties and equipment at September 30, 2018 and December 31, 2017 is as follows: Successor September 30, December 31, (In thousands) 2018 2017 Properties and equipment: Vessels and related equipment $ 817,798 850,268 Other properties and equipment 5,450 5,710 823,248 855,978 Less accumulated depreciation and amortization 46,608 18,458 Net properties and equipment $ 776,640 837,520
Schedule Of Other Assets	A summary of other assets at September 30, 2018 and December 31, 2017 is as follows: Successor September 30, December 31, (In thousands) 2018 2017 Recoverable insurance losses $ 4,056 2,405 Investments held for supplemental savings plan accounts 5,448 6,583 Long-term deposits 14,176 16,217 Other 5,020 5,847 $ 28,700 31,052
Schedule of Accrued Expenses	A summary of accrued expenses at September 30, 2018 and December 31, 2017 is as follows: Successor September 30, December 31, (In thousands) 2018 2017 Payroll and related payables (B) $ 9,539 17,344 Commissions payable (C) 1,932 1,898 Accrued vessel expenses 24,628 27,222 Accrued interest expense 5,935 6,036 Other accrued expenses 4,026 2,306 $ 46,060 54,806 (A) The balance at December 31, 2017 includes $8.9 million payable to the former CEO, which was paid in May 2018. (B) Excludes $26.2 million and $36.4 million of commissions due to Sonatide at September 30, 2018 and December 31, 2017, respectively. These amounts are included in amounts due to affiliates.
Schedule of Other Current Liabilities	A summary of other current liabilities at September 30, 2018 and December 31, 2017 is as follows: Successor September 30, December 31, (In thousands) 2018 2017 Taxes payable $ 16,308 10,326 Amounts payable to holders of General Unsecured Claims — 8,474 Other 2,586 893 $ 18,894 19,693
Schedule of Other Liabilities and Deferred Credits	A summary of other liabilities at September 30, 2018 and December 31, 2017 is as follows: Successor September 30, December 31, (In thousands) 2018 2017 Postretirement benefits liability $ 2,350 2,642 Pension liabilities 36,367 36,614 Deferred supplemental savings plan liability 5,450 6,592 Other 9,614 12,728 $ 53,781 58,576

SEGMENT AND GEOGRAPHIC DISTRI_2

SEGMENT AND GEOGRAPHIC DISTRIBUTION OF OPERATIONS (Tables)	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Segment Information, Geographical Data and Major Customers	The following tables provide a comparison of segment revenues, vessel operating profit (loss), depreciation and amortization, and additions to properties and equipment. Vessel revenues and operating costs relate to vessels owned and operated by the company while other operating revenues relate to brokered vessels and other miscellaneous marine-related businesses. Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Revenues: Vessel revenues: Americas $ 28,039 17,449 8,961 Middle East/Asia Pacific 19,927 16,669 8,547 Europe/Mediterranean Sea 12,566 8,860 4,435 West Africa 36,479 27,593 12,397 97,011 70,571 34,340 Other operating revenues (A) 2,181 3,729 1,923 $ 99,192 74,300 36,263 Vessel operating profit (loss): Americas $ 1,212 (2,651 ) (6,850 ) Middle East/Asia Pacific (701 ) 944 (118 ) Europe/Mediterranean Sea (2,056 ) (711 ) (2,517 ) West Africa 3,912 687 (6,054 ) 2,367 (1,731 ) (15,539 ) Other operating profit 485 809 821 2,852 (922 ) (14,718 ) Corporate general and administrative expenses (B) (9,415 ) (4,797 ) (2,840 ) Corporate depreciation (99 ) (67 ) (163 ) Corporate expenses (9,514 ) (4,864 ) (3,003 ) Gain (loss) on asset dispositions, net (1,571 ) 4 372 Asset impairments (C) (16,853 ) — (21,325 ) Operating loss $ (25,086 ) (5,782 ) (38,674 ) Foreign exchange gain (loss) 1 (58 ) (2,024 ) Equity in net earnings (losses) of unconsolidated companies 56 1,305 269 Interest income and other, net 2,709 873 704 Reorganization items — (1,880 ) (1,083,729 ) Interest and other debt costs, net (7,585 ) (5,240 ) (574 ) Loss before income taxes $ (29,905 ) (10,782 ) (1,124,028 ) Depreciation and amortization: Americas $ 3,858 2,295 3,197 Middle East/Asia Pacific 2,939 1,807 2,221 Europe/Mediterranean Sea 2,313 1,154 2,257 West Africa 4,176 2,407 3,037 13,286 7,663 10,712 Other 5 412 285 Corporate 99 67 163 $ 13,390 8,142 11,160 Additions to properties and equipment: Americas $ 564 — — Middle East/Asia Pacific 568 377 394 Europe/Mediterranean Sea — — — West Africa 54 159 101 1,186 536 495 Corporate (D) 2,155 53 143 $ 3,341 589 638 (A) Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from July 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $0.4 million, respectively of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017. (B) Included in corporate general and administrative expenses for the three month p eriod ended September 30, 2018 (Successor), are (C) Refer to Note (14) for additional information regarding asset impairment. (D) Included in Corporate are additions to properties and equipment relating to a vessel under construction which has not been assigned to a non-corporate reporting segment as of the date presented. Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through (In thousands) September 30, 2018 September 30, 2017 July 31, 2017 Revenues: Vessel revenues: Americas $ 86,721 17,449 121,380 Middle East/Asia Pacific 60,721 16,669 62,991 Europe/Mediterranean Sea 35,546 8,860 25,631 West Africa 105,691 27,593 93,499 288,679 70,571 303,501 Other operating revenues (A) 7,607 3,729 8,617 $ 296,286 74,300 312,118 Vessel operating profit (loss): Americas $ 11,804 (2,651 ) 8,069 Middle East/Asia Pacific (2,329 ) 944 (7,597 ) Europe/Mediterranean Sea (6,753 ) (711 ) (19,783 ) West Africa 3,867 687 (14,180 ) 6,589 (1,731 ) (33,491 ) Other operating profit 2,767 809 651 9,356 (922 ) (32,840 ) Corporate general and administrative expenses (B) (23,909 ) (4,797 ) (39,299 ) Corporate depreciation (299 ) (67 ) (1,268 ) Corporate expenses (24,208 ) (4,864 ) (40,567 ) Gain on asset dispositions, net 1,686 4 9,625 Asset impairments (C) (24,254 ) — (249,606 ) Operating loss $ (37,420 ) (5,782 ) (313,388 ) Foreign exchange loss (1,349 ) (58 ) (2,516 ) Equity in net earnings (losses) of unconsolidated companies (14,993 ) 1,305 7,627 Interest income and other, net 5,495 873 3,974 Reorganization items — (1,880 ) (1,396,905 ) Interest and other debt costs, net (22,731 ) (5,240 ) (32,188 ) Loss before income taxes $ (70,998 ) (10,782 ) (1,733,396 ) Depreciation and amortization: Americas $ 10,700 2,295 25,242 Middle East/Asia Pacific 8,552 1,807 18,466 Europe/Mediterranean Sea 6,356 1,154 15,621 West Africa 12,269 2,407 22,447 37,877 7,663 81,776 Other 16 412 1,995 Corporate 299 67 1,268 $ 38,192 8,142 85,039 Additions to properties and equipment: Americas $ 2,831 — 27 Middle East/Asia Pacific 2,064 377 2,067 Europe/Mediterranean Sea 134 — — West Africa 35 159 469 5,064 536 2,563 Corporate (D) 4,052 53 7,775 $ 9,116 589 10,338 (A) Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from January 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $1.1 million, respectively of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017. (B) Included in corporate general and administrative expenses for the period from January 1, 2017 through July 31, 2017 (Predecessor), are r eriod ended September 30, 2018 (Successor), are (C) Refer to Note (14) for additional information regarding asset impairment. (D) Included in Corporate are additions to properties and equipment relating to a vessel under construction which has not yet been assigned to a non-corporate reporting segment as of the dates presented.
Comparison of Total Assets	The following table provides a comparison of total assets at September 30, 2018 and December 31, 2017: September 30, December 31, (In thousands) 2018 2017 Total assets (A): Americas (B) $ 319,487 164,958 Middle East/Asia Pacific 203,320 48,268 Europe/Mediterranean Sea 153,877 171,157 West Africa (C) 458,327 864,299 1,135,011 1,248,682 Other — 2,443 1,135,011 1,251,125 Investments in, at equity, and advances to unconsolidated companies 1,129 29,216 1,136,140 1,280,341 Corporate (D) 454,769 465,839 $ 1,590,909 1,746,180 (A) The company’s segment level assets as of September 30, 2018, reflect the elimination of certain intersegment balances. (B) Americas segment assets include cash held by non-corporate subsidiaries of $100.3 million and $95.1 million, as of September 30, 2018 and December 31, 2017, respectively. (C) West Africa segment assets include due from related parties of $174.3 million and $263.7 million as of September 30, 2018 and December 31, 2017, respectively. (D) Corporate includes cash (including restricted cash) of $350.2 million and $336.4 million as of September 30, 2018 and December 31, 2017, respectively. Also included in Corporate at December 31, 2017 is a vessel under construction which has not yet been assigned to a non-corporate reporting segment. A vessel’s construction costs are reported in Corporate until the earlier of the date the vessel is assigned to a non-corporate reporting segment or the date it is delivered. At December 31, 2017,
Schedule of Segment Reporting Information, Revenue by Vessel Class	The following tables compare revenue by segment, and in total for the worldwide fleet, along with the respective percentage of total vessel revenue: Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through September 30, 2018 September 30, 2017 July 31, 2017 Vessel revenue by vessel class (In thousands) % of Vessel Revenue % of Vessel Revenue % of Vessel Revenue Americas fleet: Deepwater $ 19,513 20 % $ 9,798 14 % 4,304 12 % Towing-supply 6,417 7 % 5,572 8 % 3,747 11 % Other 2,109 2 % 2,079 3 % 910 3 % Total $ 28,039 29 % $ 17,449 25 % 8,961 26 % Middle East/Asia Pacific fleet: Deepwater $ 7,607 8 % $ 5,726 8 % 2,667 8 % Towing-supply 12,156 12 % 10,943 16 % 5,880 17 % Other 164 <1 % — — — — Total $ 19,927 20 % $ 16,669 24 % 8,547 25 % Europe/Mediterranean Sea fleet: Deepwater $ 11,643 12 % $ 7,810 11 % 3,383 10 % Towing-supply 923 1 % 1,050 1 % 1,052 3 % Other — — — — — — Total $ 12,566 13 % $ 8,860 12 % $ 4,435 13 % West Africa fleet: Deepwater $ 15,101 16 % $ 9,772 14 % 4,205 12 % Towing-supply 17,805 18 % 13,999 20 % 7,072 21 % Other 3,573 4 % 3,822 5 % 1,120 3 % Total $ 36,479 38 % $ 27,593 39 % $ 12,397 36 % Worldwide fleet: Deepwater $ 53,864 56 % $ 33,106 47 % 14,559 42 % Towing-supply 37,301 38 % 31,564 45 % 17,751 52 % Other 5,846 6 % 5,901 8 % 2,030 6 % Total $ 97,011 100 % $ 70,571 100 % 34,340 100 % Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through September 30, 2018 September 30, 2017 July 31, 2017 Vessel revenue by vessel class (In thousands) % of Vessel Revenue % of Vessel Revenue % of Vessel Revenue Americas fleet: Deepwater (A) $ 58,379 20 % $ 9,798 14 % 84,448 28 % Towing-supply 20,824 7 % 5,572 8 % 29,759 10 % Other 7,518 3 % 2,079 3 % 7,173 2 % Total $ 86,721 30 % $ 17,449 25 % 121,380 40 % Middle East/Asia Pacific fleet: Deepwater $ 26,774 9 % $ 5,726 8 % 22,801 8 % Towing-supply 33,762 12 % 10,943 16 % 40,190 13 % Other 185 <1 % — — — — Total $ 60,721 21 % $ 16,669 24 % 62,991 21 % Europe/Mediterranean Sea fleet: Deepwater $ 33,260 11 % $ 7,810 11 % 21,473 7 % Towing-supply 2,286 1 % 1,050 1 % 4,167 1 % Other — — — — (9 ) (<1 %) Total $ 35,546 12 % $ 8,860 12 % 25,631 8 % West Africa fleet: Deepwater $ 43,354 15 % $ 9,772 14 % 31,306 10 % Towing-supply 51,265 18 % 13,999 20 % 53,769 18 % Other 11,072 4 % 3,822 5 % 8,424 3 % Total $ 105,691 37 % $ 27,593 39 % 93,499 31 % Worldwide fleet: Deepwater (A) $ 161,767 55 % $ 33,106 47 % 160,028 53 % Towing-supply 108,137 38 % 31,564 45 % 127,885 42 % Other 18,775 7 % 5,901 8 % 15,588 5 % Total (A) $ 288,679 100 % $ 70,571 100 % 303,501 100 % (A) Included in Americas fleet deepwater, Worldwide fleet deepwater and Worldwide total vessel revenues for the period January 1, 2017 through July 31, 2017 (Predecessor), is $39.1 million of revenue related to the early cancellation of a long-term vessel charter contract.

ASSET IMPAIRMENTS (Tables)

ASSET IMPAIRMENTS (Tables)	9 Months Ended
	Sep. 30, 2018
Asset Impairment Charges [Abstract]
Summary of Vessels Impaired and Amount of Impairment Incurred	The below tables summarize the number of vessels impaired and the amount of the impairment incurred. Successor Predecessor Period from Period from Three Months August 1, 2017 July 1, 2017 Ended through through (In thousands, except number of vessels impaired) September 30, 2018 September 30, 2017 July 31, 2017 Number of vessels impaired in the period (A) 15 — 8 Amount of impairment incurred $ 16,853 — 21,325 (A) For the three month period ended September 30, 2018, (Successor) there were 15 stacked vessels impaired. For the period July 1 through July 31, 2017 there were seven stacked vessels and one active vessel impaired. Successor Predecessor Period from Period from Nine Months August 1, 2017 January 1, 2017 Ended through through (In thousands, except number of vessels impaired) September 30, 2018 September 30, 2017 July 31, 2017 Number of vessels impaired in the period (A) 30 — 97 Amount of impairment incurred $ 24,254 — 249,606 (A) For the nine month period ended September 30, 2018, (Successor) there were 30 stacked vessels impaired. For the period January 1 through July 31, 2017 there were 90 stacked vessels and seven active vessels impaired.

Schedule of Segment Reporting I

Schedule of Segment Reporting Information, Revenue by Vessel (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended		3 Months Ended	7 Months Ended		9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017		Sep. 30, 2018	Jul. 31, 2017		Sep. 30, 2018
Segment Reporting Information [Line Items]
Total revenues		$ 74,300		$ 99,192			$ 296,286
Vessel Revenues
Segment Reporting Information [Line Items]
Total revenues		70,571		97,011			288,679
Vessel Revenues | Americas
Segment Reporting Information [Line Items]
Total revenues		17,449	[1]	28,039			86,721	[1]
Vessel Revenues | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Total revenues		16,669		19,927			60,721
Vessel Revenues | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Total revenues		8,860		12,566			35,546
Vessel Revenues | West Africa
Segment Reporting Information [Line Items]
Total revenues		$ 27,593		$ 36,479			$ 105,691
Predecessor
Segment Reporting Information [Line Items]
Total revenues	$ 36,263				$ 312,118
Predecessor | Vessel Revenues
Segment Reporting Information [Line Items]
Total revenues	34,340				303,501
Predecessor | Vessel Revenues | Americas
Segment Reporting Information [Line Items]
Total revenues	8,961				121,380	[1]
Predecessor | Vessel Revenues | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Total revenues	8,547				62,991
Predecessor | Vessel Revenues | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Total revenues	4,435				25,631
Predecessor | Vessel Revenues | West Africa
Segment Reporting Information [Line Items]
Total revenues	$ 12,397				$ 93,499
[1]	Included in Americas and total vessel revenues for the period January 1, 2017 through July 31, 2017 (Predecessor), is $39.1 million of revenue related to the early cancellation of a long-term vessel charter contract.

Schedule of Segment Reporting_2

Schedule of Segment Reporting Information, Revenue by Vessel (Parenthetical) (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Jul. 31, 2017	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total revenues		$ 74,300	$ 99,192		$ 296,286
Predecessor
Segment Reporting Information [Line Items]
Total revenues	$ 36,263			$ 312,118
Early Cancellation of Long Term Vessel Charter Contract | Predecessor | Americas
Segment Reporting Information [Line Items]
Total revenues				$ 39,100

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Detail) - Vessel Mobilization $ in Millions	Sep. 30, 2018USD ($)
Disaggregation of Revenue [Line Items]
Deferred costs included within other current assets	$ 0.3
Contract liabilities/deferred revenue included within other current liabilities	$ 0.6

Summarizes The Revenue Expected

Summarizes The Revenue Expected to be Recognized in Future Related to Unsatisfied Performance Obligations (Detail) - Unsatisfied Performance Obligations - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Revenue expected to be recognized in future related to unsatisfied performance obligations [Line Items]
Contract liabilities/deferred revenue		$ 552
Scenario, Forecast
Revenue expected to be recognized in future related to unsatisfied performance obligations [Line Items]
Contract liabilities/deferred revenue	$ 552

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Jul. 31, 2017	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance					$ 1,021,944
Balance	$ 1,057,084	$ 1,042,814	$ 943,908	$ 1,057,084	943,908
Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance				1,747,564
Balance	2,161			2,161
Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance					256
Gains/(losses) recognized in OCI		7			(660)
Reclasses from OCI to net income		75			404
Net period OCI		82			(256)
Balance		82	0		0
Available for Sale Securities | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(9)			(1)
Gains/(losses) recognized in OCI	51			(158)
Reclasses from OCI to net income	26			227
Net period OCI	77			69
Balance	68			68
Pension/Post-retirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(403)		(403)
Gains/(losses) recognized in OCI		0	0		0
Reclasses from OCI to net income			0		0
Net period OCI			0		0
Balance			(403)		(403)
Pension/Post-retirement Benefits | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(438)			4,683
Gains/(losses) recognized in OCI	(2,598)			(7,719)
Reclasses from OCI to net income	0			0
Net period OCI	(2,598)			(7,719)
Balance	(3,036)			(3,036)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(403)		(147)
Gains/(losses) recognized in OCI		7			(660)
Reclasses from OCI to net income		75			404
Net period OCI		82			(256)
Balance		82	$ (403)		$ (403)
Accumulated other comprehensive loss | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(10,258)			(6,446)
Gains/(losses) recognized in OCI	(2,547)			(7,877)
Reclasses from OCI to net income	26			1,544
Net period OCI	(2,521)			(6,333)
Balance	(12,779)			(12,779)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gains/(losses) recognized in OCI		0
Reclasses from OCI to net income		0
Net period OCI		$ 0
Currency Translation Adjustment | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(9,811)			(9,811)
Gains/(losses) recognized in OCI	0			0
Reclasses from OCI to net income	0			0
Net period OCI	0			0
Balance	$ (9,811)			(9,811)
Interest Rate Swaps | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance				(1,317)
Reclasses from OCI to net income				1,317
Net period OCI				$ 1,317

Reclassifications from Accumula

Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Jul. 31, 2017	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net		$ 873	$ 2,709		$ 5,495
Loss before income taxes		(10,782)	(29,905)		(70,998)
Tax effect		4,745	1,278		10,396
Net loss attributable to Tidewater Inc.		(15,693)	(30,896)		(81,008)
Interest and other debt costs		5,240	$ 7,585		22,731
Predecessor
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net	$ 704			$ 3,974
Loss before income taxes	(1,124,028)			(1,733,396)
Tax effect	(1,529)			483
Net loss attributable to Tidewater Inc.	(1,122,475)			(1,741,763)
Interest and other debt costs	574			32,188
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss before income taxes		75			404
Net loss attributable to Tidewater Inc.		75			404
Reclassification out of Accumulated Other Comprehensive Income | Available for Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net		$ 75			$ 404
Reclassification out of Accumulated Other Comprehensive Income | Predecessor
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss before income taxes	26			2,571
Tax effect				1,027
Net loss attributable to Tidewater Inc.	26			1,544
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Available for Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net	$ 26			431
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Interest Rate Swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other debt costs				$ 2,140

Schedule of Unrecognized Tax Be

Schedule of Unrecognized Tax Benefits Which Would Lower Effective Tax Rate if Realized (Detail) - State and Local Jurisdiction $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
Income Tax Contingency [Line Items]
Unrecognized tax benefit related to state tax issues	$ 12,425
Interest receivable on unrecognized tax benefit related to state tax issues	$ 60

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net deferred tax assets	$ 50,900,000	$ 43,200,000
Valuation allowance	$ 50,900,000	$ 43,200,000
Federal statutory tax rate	21.00%
Adjustments to provisional amounts recorded	$ 0
One-time transition tax, adjustments to provisional amounts recorded	0
Tax act, executive compensation, cap on deductibility, amount	$ 1,000,000
Tax act, interest expense limitation, minimum percentage of adjusted taxable income	30.00%
Estimate of interest expense limitation before consideration of valuation allowance	$ 11,000,000
Net impact in income loss	$ 0

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) kr in Millions	1 Months Ended	2 Months Ended	3 Months Ended		7 Months Ended		9 Months Ended
	May 31, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Jul. 31, 2017USD ($)	Jul. 31, 2017NOK (kr)	Sep. 30, 2018USD ($)	Sep. 30, 2018NOK (kr)
President, and Chief Executive Officer | Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Settlement of distribution	$ 8,900,000
Settlement loss				$ 300,000
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions		$ 0	$ 0				$ 0
Pension Plans, Defined Benefit | Predecessor
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions					$ 0
Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions		0	300,000				600,000
Expected contribution to the plan during the remaining quarters of fiscal 2018			300,000				300,000
Supplemental Executive Retirement Plan | Predecessor
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions					0
Norway’s Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions		$ 0	0				200,000	kr 1.9
Expected contribution to the plan during the remaining quarters of fiscal 2018			$ 0				$ 0
Norway’s Defined Benefit Pension Plan | Predecessor
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions					$ 400,000	kr 3

Schedule of Carrying Value of T

Schedule of Carrying Value of Trust Assets, Including Unrealized Gains or Losses (Detail) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Investments held in Rabbi Trust at fair value	[1]	$ 38	$ 8,908
Unrealized gains in fair value of trust assets			256
Obligations under the supplemental plan		$ 23,711	$ 32,508
[1]	The company converted substantially all investments held in the rabbi trust to cash to fund a lump sum benefit to the former CEO in May 2018. Refer to Note (6) for more information regarding this payment.

Schedule of Net Periodic Benefi

Schedule of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Jul. 31, 2017	Sep. 30, 2018
Pension Benefits
Net Period Benefit Cost Assumptions [Line Items]
Service cost		$ 203	$ 47		$ 118
Interest cost		624	872		2,656
Expected return on plan assets		(332)	(481)		(1,446)
Administrative expenses		2	3		6
Settlement loss recognized					335
Net periodic pension cost		497	441		1,669
Pension Benefits | Predecessor
Net Period Benefit Cost Assumptions [Line Items]
Service cost	$ 99			$ 812
Interest cost	328			2,304
Expected return on plan assets	(173)			(1,292)
Administrative expenses	1			25
Payroll tax of net pension costs				56
Amortization of net actuarial losses				32
Recognized actuarial (benefit) loss	187			1,195
Net periodic pension cost	442			3,132
Other Benefits
Net Period Benefit Cost Assumptions [Line Items]
Service cost		12	15		45
Interest cost		30	29		88
Amortization of prior service cost			(75)		(224)
Recognized actuarial (benefit) loss			11		32
Net periodic pension cost		$ 42	$ (20)		$ (59)
Other Benefits | Predecessor
Net Period Benefit Cost Assumptions [Line Items]
Service cost	6			44
Interest cost	16			115
Amortization of prior service cost	(232)			(2,015)
Recognized actuarial (benefit) loss	(83)			(618)
Net periodic pension cost	$ (293)			$ (2,474)

Summary of Debt Outstanding (De

Summary of Debt Outstanding (Detail) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Debt [Line Items]
Amount outstanding	[1]	$ 435,018	$ 438,827
Debt premiums and discounts, net		7,954	9,333
Less: Current portion of long-term debt		(7,671)	(5,103)
Total long-term debt		435,301	443,057
8.00% Secured Notes Due August 2022
Debt [Line Items]
Secured notes	[2]	349,954	350,000
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS
Debt [Line Items]
Amount outstanding	[1]	13,593	14,054
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS
Debt [Line Items]
Amount outstanding	[1]	24,545	25,965
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS
Debt [Line Items]
Amount outstanding	[1]	22,116	23,345
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS
Debt [Line Items]
Amount outstanding	[1]	$ 24,810	$ 25,463
[1]	The company pays principal and interest on these notes semi-annually. As of September 30, 2018 and December 31, 2017, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $85.0 million and $88.5 million, respectively. The weighted average interest rate of the Troms Offshore borrowings as of September 30, 2018, was 5.01%.
[2]	As of September 30, 2018 and December 31, 2017, the fair value (Level 2) of the Secured Notes was $369.2 million and $359.8 million, respectively.

Summary of Debt Outstanding (Pa

Summary of Debt Outstanding (Parenthetical) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Troms Offshore Supply AS
Debt [Line Items]
Description of frequency of periodic payments on notes	semi-annually
Weighted average interest rate of debt borrowings	5.01%
Troms Offshore Supply AS | Level 2
Debt [Line Items]
Fair value of debt outstanding	$ 85	$ 88.5
8.00% Secured Notes Due August 2022
Debt [Line Items]
Debt instrument interest rate	8.00%
Debt Instrument Maturity Period	August 2,022
8.00% Secured Notes Due August 2022 | Level 2
Debt [Line Items]
Fair value of debt outstanding	$ 369.2	$ 359.8
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS
Debt [Line Items]
Debt Instrument Maturity Period	May 2,024
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS
Debt [Line Items]
Debt Instrument Maturity Period	January 2,026
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS
Debt [Line Items]
Debt Instrument Maturity Period	January 2,027
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS
Debt [Line Items]
Debt Instrument Maturity Period	April 2,027

Indebtedness - Additional Infor

Indebtedness - Additional Information (Detail) - USD ($)	Feb. 02, 2018	Jul. 31, 2017	Sep. 30, 2018	Mar. 07, 2018	Dec. 31, 2017
Debt [Line Items]
Restricted cash			$ 7,466,000		$ 21,300,000
Tendered Notes
Debt [Line Items]
Debt Instrument Face Amount				$ 46,023
Offer | Senior Secured Notes
Debt [Line Items]
Debt instrument fixed interest rate	8.00%
Debt instrument maturity year	2,022
Predecessor | Offer
Debt [Line Items]
Debt instrument repurchase period		60 days
Percentage of proceeds from Asset Sales, net of commission paid		65.00%
Minimum | Predecessor | Offer
Debt [Line Items]
Net proceeds realized from asset sales exceed amount		$ 10,000,000
Maximum | Offer | Senior Secured Notes
Debt [Line Items]
Debt Instrument Face Amount	$ 24,700,000

Debt Costs (Detail)

Debt Costs (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Jul. 31, 2017	Sep. 30, 2018
Debt [Line Items]
Interest and debt costs incurred, net of interest capitalized		$ 5,240	$ 7,585		$ 22,731
Interest costs capitalized			153		521
Total interest and debt costs		$ 5,240	$ 7,738		$ 23,252
Predecessor
Debt [Line Items]
Interest and debt costs incurred, net of interest capitalized	$ 574			$ 32,188
Interest costs capitalized				1,817
Total interest and debt costs	$ 574			$ 34,005

Components of Basic and Diluted

Components of Basic and Diluted Loss Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
		Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Jul. 31, 2017	Sep. 30, 2018
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net loss available to common shareholders			$ (15,693)	$ (30,896)		$ (81,008)
Weighted average outstanding shares of common stock, basic	[1]		19,389,031	26,614,507		25,073,284
Weighted average shares of common stock and equivalents			19,389,031	26,614,507		25,073,284
Loss per share, basic	[2]		$ (0.81)	$ (1.16)		$ (3.23)
Loss per share, diluted	[3]		$ (0.81)	$ (1.16)		$ (3.23)
In-the-money Options, Warrants and Restricted Stock Awards and Units
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Incremental "in-the-money" options, warrants, and restricted stock awards and units at the end of the period	[4]		15,513,573	3,476,437		5,143,206
Predecessor
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net loss available to common shareholders		$ (1,122,475)			$ (1,741,763)
Weighted average outstanding shares of common stock, basic	[1]	47,121,407			47,104,117
Weighted average shares of common stock and equivalents		47,121,407			47,104,117
Loss per share, basic	[2]	$ (23.82)			$ (36.98)
Loss per share, diluted	[3]	$ (23.82)			$ (36.98)
Predecessor | In-the-money Options, Warrants and Restricted Stock Awards and Units
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Incremental "in-the-money" options, warrants, and restricted stock awards and units at the end of the period	[4]	183			183
[1]	Common shares and New Creditor Warrants and the sum of common shares and New Creditor Warrants outstanding at September 30, 2018, were 26,815,991, 3,512,416 and 30,328,407, respectively.
[2]	The company calculates “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding shares of common stock, basic”.
[3]	The company calculates “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average common stock and equivalents”.
[4]	For the nine months ended September 30, 2018, the company also had 5,062,089 shares of “out-of- the-money” warrants outstanding at the end of the period.

Components of Basic and Dilut_2

Components of Basic and Diluted Loss Per Share (Parenthetical) (Detail) - shares	Sep. 30, 2018	Dec. 31, 2017
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Common shares outstanding	26,815,991	22,115,916
Warrants outstanding	3,512,416
Common shares and new creditor warrants outstanding	30,328,407
Out-of-the-money Warrants
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Warrants outstanding	5,062,089

Related Party Balances - Schedu

Related Party Balances - Schedule of Balances with Related Parties (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Due to related parties:
Due from related parties, net of due to related parties	$ 126,285	$ 154,575
Sonatide Marine, Ltd. | ANGOLA
Due from related parties:
Total due from related parties	133,277	230,315
Due to related parties:
Total due to related parties	30,765	99,448
DTDW Holdings, Ltd. | NIGERIA
Due from related parties:
Total due from related parties	41,072	33,353
Due to related parties:
Total due to related parties	$ 17,299	$ 9,645

Related Party Balances - Additi

Related Party Balances - Additional Information (Detail) - DTDW Holdings, Ltd. - NIGERIA - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Due from related party	$ 41,072	$ 33,353
Due to related party	$ 17,299	9,645
Trade and Other Receivables, Net
Related Party Transaction [Line Items]
Due from related party		33,400
Accounts Payable
Related Party Transaction [Line Items]
Due to related party		$ 9,600

Commitments and Contingencies (

Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail)		2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
		Sep. 30, 2017USD ($)Vessel	Sep. 30, 2018USD ($)VesselKz / $	Jul. 31, 2017USD ($)Vessel	Sep. 30, 2018USD ($)VesselKz / $	Jul. 15, 2018	Dec. 31, 2017USD ($)Kz / $	Sep. 30, 2014Vessel
Commitments and Contingencies Disclosure [Line Items]
Due from affiliates			$ 174,349,000		$ 174,349,000		$ 230,315,000
Cash and cash equivalents			461,088,000		461,088,000		432,035,000
Due to affiliates			48,064,000		48,064,000		99,448,000
Commissions payable	[1]		1,932,000		1,932,000		1,898,000
Total revenues		$ 74,300,000	99,192,000		296,286,000
Ownership Interest In Joint Venture						74.00%
Investments in, at equity, and advances to unconsolidated companies			$ 1,129,000		1,129,000		$ 29,216,000
Dividend received in excess of investment					$ 5,000,000
Devaluation Of Angolan kwanza Versus US Dollar
Commitments and Contingencies Disclosure [Line Items]
Foreign currency exchange rate | Kz / $			294		294		168
Percentage of devaluation of currency					75.00%
Vessel Revenues
Commitments and Contingencies Disclosure [Line Items]
Total revenues		$ 70,571,000	$ 97,011,000		$ 288,679,000
ANGOLA
Commitments and Contingencies Disclosure [Line Items]
Number of vessels operating | Vessel			36		36			81
Decrease in number of vessels operating | Vessel			45		45
Decrease in number of active vessels | Vessel			55		55
Number of active vessels | Vessel			21		21			76
Sonatide joint venture
Commitments and Contingencies Disclosure [Line Items]
Due from affiliates			$ 134,000,000		$ 134,000,000		$ 230,000,000
Unpaid vessel revenue			23,000,000		23,000,000
Due to affiliates			31,000,000		31,000,000		99,000,000
Commissions payable			$ 26,200,000		26,200,000		36,400,000
Due from affiliates and due to affiliates					$ 71,000,000
Number of vessels operating | Vessel			4		4
Number of vessels stacked | Vessel			2		2
Ownership Interest In Joint Venture			49.00%		49.00%
Investments in, at equity, and advances to unconsolidated companies			$ 0		$ 0		$ 27,000,000
Dividend received					12,000,000
Sonatide joint venture | ANGOLA
Commitments and Contingencies Disclosure [Line Items]
Proceeds from related party					$ 69,000,000
Percentage of Angolan operation revenue		20.00%		20.00%	15.00%
Number of vessels operating | Vessel		44	38	52	38
Number of vessels stacked | Vessel		16	16	22	16
Number of vessels transferred out of Angola | Vessel					2
Sonatide joint venture | ANGOLA | Vessel Revenues
Commitments and Contingencies Disclosure [Line Items]
Total revenues		$ 14,000,000		$ 60,000,000	$ 44,000,000
Sonatide joint venture | U.S. dollars initially received by Sonatide on behalf of the company or dollars collected from other customers
Commitments and Contingencies Disclosure [Line Items]
Proceeds from related party					61,000,000
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to company
Commitments and Contingencies Disclosure [Line Items]
Proceeds from related party					8,000,000
Sonatide joint venture | Angolan kwanza-denominated
Commitments and Contingencies Disclosure [Line Items]
Bank deposits maintained			$ 67,000,000		67,000,000
Cash and cash equivalents			$ 36,000,000		$ 36,000,000
[1]	Excludes $26.2 million and $36.4 million of commissions due to Sonatide at September 30, 2018 and December 31, 2017,

Commitments and Contingencies_2

Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail) R$ in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2018BRL (R$)	Apr. 30, 2011USD ($)	Apr. 30, 2011BRL (R$)
Commitments and Contingencies Disclosure [Line Items]
Fines assessed			$ 98.7	R$ 155
Maximum
Commitments and Contingencies Disclosure [Line Items]
Reducing remaining assessment	$ 2.5	R$ 10

Commitment and Contingencies (R

Commitment and Contingencies (Repairs to U.S. Flagged Vessels Operating Abroad) - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Percentage of vessel repair duty	50.00%

Commitment and Contingencies (A

Commitment and Contingencies (Arbitral Award for the Taking of the Company's Venezuelan Operations) - Additional Information (Detail) - Compensatory Purposes - VENEZUELA $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)Subsidiary
Commitments and Contingencies Disclosure [Line Items]
Number of subsidiaries awarded grant | Subsidiary	2
Compensation awarded to the claimants	$ 57.5
Litigation settlement accrual interest	$ 0.6

Schedule of Fair Value Assets a

Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fair value of plan assets	[1]	$ 38	$ 8,908
Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets			8,909
Other pending transactions			(1)
Total fair value of plan assets		38	8,908
Supplemental Executive Retirement Plan | Measured At Net Asset Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets			1,725
Total fair value of plan assets		38	1,725
Supplemental Executive Retirement Plan | Quoted Prices In Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets			6,173
Other pending transactions			(1)
Total fair value of plan assets			6,172
Supplemental Executive Retirement Plan | Significant Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets			1,011
Total fair value of plan assets			1,011
Supplemental Executive Retirement Plan | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets		38	246
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Measured At Net Asset Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets		$ 38	49
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Quoted Prices In Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets			27
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Significant Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets			170
Supplemental Executive Retirement Plan | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets			5,295
Supplemental Executive Retirement Plan | Equity Securities | Quoted Prices In Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets			5,295
Supplemental Executive Retirement Plan | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets			3,368
Supplemental Executive Retirement Plan | Debt Securities | Measured At Net Asset Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets			1,676
Supplemental Executive Retirement Plan | Debt Securities | Quoted Prices In Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets			851
Supplemental Executive Retirement Plan | Debt Securities | Significant Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets			$ 841
[1]	The company converted substantially all investments held in the rabbi trust to cash to fund a lump sum benefit to the former CEO in May 2018. Refer to Note (6) for more information regarding this payment.

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Cash equivalents maturity period, days	90 days

Schedule of Fair Value Other Fi

Schedule of Fair Value Other Financial Instruments Measured (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	$ 420,733	$ 399,322
Quoted Prices In Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	420,733	399,322
Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	420,733	399,322
Cash Equivalents | Quoted Prices In Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	$ 420,733	$ 399,322

Schedule of Other Current Asset

Schedule of Other Current Assets (Detail) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Other Current Assets, Properties and Equipment, Other Assets Accrued Expenses Other Current Liabilities and other Non current liabilities and Deferred Credits [Abstract]
Deposits		$ 1,403	$ 1,780
Investments held in rabbi trust	[1]	38	8,908
Prepaid expenses		8,439	8,442
Total other current assets		$ 9,880	$ 19,130
[1]	The company converted substantially all investments held in the rabbi trust to cash to fund a lump sum benefit to the former CEO in May 2018. Refer to Note (6) for more information regarding this payment.

Summary of Net Properties and E

Summary of Net Properties and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Vessels and related equipment	$ 817,798	$ 850,268
Other properties and equipment	5,450	5,710
Properties and equipment, gross	823,248	855,978
Less accumulated depreciation and amortization	46,608	18,458
Net properties and equipment	$ 776,640	$ 837,520

Schedule of Other Assets (Detai

Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Other Assets, Noncurrent [Abstract]
Recoverable insurance losses	$ 4,056	$ 2,405
Investments held for supplemental savings plan accounts	5,448	6,583
Long-term deposits	14,176	16,217
Other	5,020	5,847
Total other assets	$ 28,700	$ 31,052

Schedule of Accrued Expenses (D

Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Accounts Payable and Accrued Liabilities Current [Abstract]
Payroll and related payables	[1]	$ 9,539	$ 17,344
Commissions payable	[2]	1,932	1,898
Accrued vessel expenses		24,628	27,222
Accrued interest expense		5,935	6,036
Other accrued expenses		4,026	2,306
Accrued expenses		$ 46,060	$ 54,806
[1]	The balance at December 31, 2017 includes $8.9 million payable to the former CEO, which was paid in May 2018.
[2]	Excludes $26.2 million and $36.4 million of commissions due to Sonatide at September 30, 2018 and December 31, 2017,

Schedule of Accrued Expenses (P

Schedule of Accrued Expenses (Parenthetical) (Detail) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Schedule of Accrued Liabilities [Line Items]
Payroll and related payables	[1]	$ 9,539	$ 17,344
Commissions payable	[2]	1,932	1,898
Sonatide joint venture
Schedule of Accrued Liabilities [Line Items]
Commissions payable		$ 26,200	36,400
Former CEO
Schedule of Accrued Liabilities [Line Items]
Payroll and related payables			$ 8,900
[1]	The balance at December 31, 2017 includes $8.9 million payable to the former CEO, which was paid in May 2018.
[2]	Excludes $26.2 million and $36.4 million of commissions due to Sonatide at September 30, 2018 and December 31, 2017,

Schedule of Other Current Liabi

Schedule of Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Other Liabilities Current [Abstract]
Taxes payable	$ 16,308	$ 10,326
Amounts payable to holders of General Unsecured Claims		8,474
Other	2,586	893
Other current liabilities	$ 18,894	$ 19,693

Schedule of Other Liabilities a

Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Deferred Credits and Other Liabilities [Abstract]
Postretirement benefits liability	$ 2,350	$ 2,642
Pension liabilities	36,367	36,614
Deferred supplemental savings plan liability	5,450	6,592
Other	9,614	12,728
Other liabilities and deferred credits	$ 53,781	$ 58,576

Segment Information, Geographic

Segment Information, Geographical Data and Major Customers (Detail) - USD ($) $ in Thousands	1 Months Ended		2 Months Ended		3 Months Ended		7 Months Ended		9 Months Ended
	Jul. 31, 2017		Sep. 30, 2017		Sep. 30, 2018		Jul. 31, 2017		Sep. 30, 2018
Segment Reporting Information [Line Items]
Total revenues			$ 74,300		$ 99,192				$ 296,286
Operating profit (loss)			(922)		2,852				9,356
General and administrative expenses			(16,246)		(25,546)				(73,536)
Depreciation and amortization			8,142		13,390				38,192
Corporate expenses			(4,864)		(9,514)				(24,208)
Gain (loss) on asset dispositions, net			4		(1,571)				1,686
Asset impairments					(16,853)	[1]			(24,254)	[2]
Operating loss			(5,782)		(25,086)				(37,420)
Foreign exchange gain (loss)			(58)		1				(1,349)
Equity in net earnings (losses) of unconsolidated companies			1,305		56				(14,993)
Interest income and other, net			873		2,709				5,495
Reorganization items			(1,880)
Interest and other debt costs, net			(5,240)		(7,585)				(22,731)
Loss before income taxes			(10,782)		(29,905)				(70,998)
Additions to properties and equipment			589		3,341				9,116
All Other Segments
Segment Reporting Information [Line Items]
Operating profit (loss)			809		485				2,767
Depreciation and amortization			412		5				16
Operating Segments
Segment Reporting Information [Line Items]
Operating profit (loss)			(1,731)		2,367				6,589
Depreciation and amortization			7,663		13,286				37,877
Additions to properties and equipment			536		1,186				5,064
Operating Segments | Americas
Segment Reporting Information [Line Items]
Operating profit (loss)			(2,651)		1,212				11,804
Depreciation and amortization			2,295		3,858				10,700
Additions to properties and equipment					564				2,831
Operating Segments | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Operating profit (loss)			944		(701)				(2,329)
Depreciation and amortization			1,807		2,939				8,552
Additions to properties and equipment			377		568				2,064
Operating Segments | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Operating profit (loss)			(711)		(2,056)				(6,753)
Depreciation and amortization			1,154		2,313				6,356
Additions to properties and equipment									134
Operating Segments | West Africa
Segment Reporting Information [Line Items]
Operating profit (loss)			687		3,912				3,867
Depreciation and amortization			2,407		4,176				12,269
Additions to properties and equipment			159		54				35
Corporate
Segment Reporting Information [Line Items]
General and administrative expenses			(4,797)	[3],[4]	(9,415)	[4]			(23,909)	[3]
Depreciation and amortization			67		99				299
Additions to properties and equipment			53	[5],[6]	2,155	[5]			4,052	[6]
Vessel Revenues
Segment Reporting Information [Line Items]
Total revenues			70,571		97,011				288,679
Vessel Revenues | Americas
Segment Reporting Information [Line Items]
Total revenues			17,449	[7]	28,039				86,721	[7]
Vessel Revenues | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Total revenues			16,669		19,927				60,721
Vessel Revenues | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Total revenues			8,860		12,566				35,546
Vessel Revenues | West Africa
Segment Reporting Information [Line Items]
Total revenues			27,593		36,479				105,691
Vessel Revenues | Operating Segments | Americas
Segment Reporting Information [Line Items]
Total revenues			17,449		28,039				86,721
Vessel Revenues | Operating Segments | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Total revenues			16,669		19,927				60,721
Vessel Revenues | Operating Segments | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Total revenues			8,860		12,566				35,546
Vessel Revenues | Operating Segments | West Africa
Segment Reporting Information [Line Items]
Total revenues			27,593		36,479				105,691
Other Operating Revenues
Segment Reporting Information [Line Items]
Total revenues			$ 3,729	[8],[9]	$ 2,181	[9]			$ 7,607	[8]
Predecessor
Segment Reporting Information [Line Items]
Total revenues	$ 36,263						$ 312,118
Operating profit (loss)	(14,718)						(32,840)
General and administrative expenses	(8,773)						(83,559)
Depreciation and amortization	11,160						85,039
Corporate expenses	(3,003)						(40,567)
Gain (loss) on asset dispositions, net	372						9,625
Asset impairments	(21,325)	[1]					(249,606)	[2]
Operating loss	(38,674)						(313,388)
Foreign exchange gain (loss)	(2,024)						(2,516)
Equity in net earnings (losses) of unconsolidated companies	269						7,627
Interest income and other, net	704						3,974
Reorganization items	(1,083,729)						(1,396,905)
Interest and other debt costs, net	(574)						(32,188)
Loss before income taxes	(1,124,028)						(1,733,396)
Additions to properties and equipment	638						10,338
Predecessor | All Other Segments
Segment Reporting Information [Line Items]
Operating profit (loss)	821						651
Depreciation and amortization	285						1,995
Predecessor | Operating Segments
Segment Reporting Information [Line Items]
Operating profit (loss)	(15,539)						(33,491)
Depreciation and amortization	10,712						81,776
Additions to properties and equipment	495						2,563
Predecessor | Operating Segments | Americas
Segment Reporting Information [Line Items]
Operating profit (loss)	(6,850)						8,069
Depreciation and amortization	3,197						25,242
Additions to properties and equipment							27
Predecessor | Operating Segments | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Operating profit (loss)	(118)						(7,597)
Depreciation and amortization	2,221						18,466
Additions to properties and equipment	394						2,067
Predecessor | Operating Segments | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Operating profit (loss)	(2,517)						(19,783)
Depreciation and amortization	2,257						15,621
Predecessor | Operating Segments | West Africa
Segment Reporting Information [Line Items]
Operating profit (loss)	(6,054)						(14,180)
Depreciation and amortization	3,037						22,447
Additions to properties and equipment	101						469
Predecessor | Corporate
Segment Reporting Information [Line Items]
General and administrative expenses	(2,840)	[4]					(39,299)	[3]
Depreciation and amortization	163						1,268
Additions to properties and equipment	143	[5]					7,775	[6]
Predecessor | Vessel Revenues
Segment Reporting Information [Line Items]
Total revenues	34,340						303,501
Predecessor | Vessel Revenues | Americas
Segment Reporting Information [Line Items]
Total revenues	8,961						121,380	[7]
Predecessor | Vessel Revenues | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Total revenues	8,547						62,991
Predecessor | Vessel Revenues | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Total revenues	4,435						25,631
Predecessor | Vessel Revenues | West Africa
Segment Reporting Information [Line Items]
Total revenues	12,397						93,499
Predecessor | Vessel Revenues | Operating Segments | Americas
Segment Reporting Information [Line Items]
Total revenues	8,961						121,380
Predecessor | Vessel Revenues | Operating Segments | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Total revenues	8,547						62,991
Predecessor | Vessel Revenues | Operating Segments | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Total revenues	4,435						25,631
Predecessor | Vessel Revenues | Operating Segments | West Africa
Segment Reporting Information [Line Items]
Total revenues	12,397						93,499
Predecessor | Other Operating Revenues
Segment Reporting Information [Line Items]
Total revenues	$ 1,923	[9]					$ 8,617	[8]
[1]	Refer to Note (14) for additional information regarding asset impairment.
[2]	Refer to Note (14) for additional information regarding asset impairment.
[3]	Included in corporate general and administrative expenses for the period from January 1, 2017 through July 31, 2017 (Predecessor), are restructuring-related professional services costs of $23.4 million. Included in corporate general and administrative expenses for the nine month period ended September 30, 2018 (Successor), are professional services costs related the proposed combination with GulfMark of $4.7 million.
[4]	Included in corporate general and administrative expenses for the three month period ended September 30, 2018 (Successor), are professional services costs related the proposed combination with GulfMark of $3.2 million.
[5]	Included in Corporate are additions to properties and equipment relating to a vessel under construction which has not been assigned to a non-corporate reporting segment as of the date presented.
[6]	Included in Corporate are additions to properties and equipment relating to a vessel under construction which has not yet been assigned to a non-corporate reporting segment as of the dates presented.
[7]	Included in Americas and total vessel revenues for the period January 1, 2017 through July 31, 2017 (Predecessor), is $39.1 million of revenue related to the early cancellation of a long-term vessel charter contract.
[8]	Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from January 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $1.1 million, respectively  of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017.
[9]	Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from July 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $0.4 million, respectively of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017.

Segment Information, Geograph_2

Segment Information, Geographical Data and Major Customers (Parenthetical) (Detail) $ in Thousands	1 Months Ended		2 Months Ended		3 Months Ended		7 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2017USD ($)		Sep. 30, 2017USD ($)		Sep. 30, 2018USD ($)		Jul. 31, 2017USD ($)		Sep. 30, 2018USD ($)		Dec. 31, 2017Vessel
Segment Reporting Information [Line Items]
Other operating revenues			$ 74,300		$ 99,192				$ 296,286
Number of ROVs disposed | Vessel											8
General and administrative expenses			16,246		25,546				73,536
Corporate
Segment Reporting Information [Line Items]
General and administrative expenses			4,797	[1],[2]	9,415	[2]			23,909	[1]
GulfMark | Corporate
Segment Reporting Information [Line Items]
General and administrative expenses					3,200				4,700
Predecessor
Segment Reporting Information [Line Items]
Other operating revenues	$ 36,263						$ 312,118
General and administrative expenses	8,773						83,559
Corporate general and administrative expenses							23,400
Predecessor | Corporate
Segment Reporting Information [Line Items]
General and administrative expenses	2,840	[2]					39,299	[1]
Other Operating Revenues
Segment Reporting Information [Line Items]
Other operating revenues			3,729	[3],[4]	$ 2,181	[4]			$ 7,607	[3]
Other Operating Revenues | Subsea Business
Segment Reporting Information [Line Items]
Other operating revenues			$ 1,600
Other Operating Revenues | Predecessor
Segment Reporting Information [Line Items]
Other operating revenues	1,923	[4]					8,617	[3]
Other Operating Revenues | Predecessor | Subsea Business
Segment Reporting Information [Line Items]
Other operating revenues	$ 400						$ 1,100
[1]	Included in corporate general and administrative expenses for the period from January 1, 2017 through July 31, 2017 (Predecessor), are restructuring-related professional services costs of $23.4 million. Included in corporate general and administrative expenses for the nine month period ended September 30, 2018 (Successor), are professional services costs related the proposed combination with GulfMark of $4.7 million.
[2]	Included in corporate general and administrative expenses for the three month period ended September 30, 2018 (Successor), are professional services costs related the proposed combination with GulfMark of $3.2 million.
[3]	Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from January 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $1.1 million, respectively  of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017.
[4]	Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from July 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $0.4 million, respectively of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017.

Comparison of Total Assets (Det

Comparison of Total Assets (Detail) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Segment and Geographic Distribution of Operations [Line Items]
Assets		$ 1,590,909	$ 1,746,180
Assets excluding equity investments		1,135,011	1,251,125
Investments in, at equity, and advances to unconsolidated companies		1,129	29,216
Assets except corporate portion		1,136,140	1,280,341
All Other Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets			2,443
Operating Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets	[1]	1,135,011	1,248,682
Operating Segments | Americas
Segment and Geographic Distribution of Operations [Line Items]
Assets	[1],[2]	319,487	164,958
Operating Segments | Middle East/Asia Pacific
Segment and Geographic Distribution of Operations [Line Items]
Assets	[1]	203,320	48,268
Operating Segments | Europe/Mediterranean Sea
Segment and Geographic Distribution of Operations [Line Items]
Assets	[1]	153,877	171,157
Operating Segments | West Africa
Segment and Geographic Distribution of Operations [Line Items]
Assets	[3]	458,327	864,299
Corporate
Segment and Geographic Distribution of Operations [Line Items]
Assets	[4]	$ 454,769	$ 465,839
[1]	The company’s segment level assets as of September 30, 2018, reflect the elimination of certain intersegment balances.
[2]	Americas segment assets include cash held by non-corporate subsidiaries of $100.3 million and $95.1 million, as of September 30, 2018 and December 31, 2017, respectively.
[3]	West Africa segment assets include due from related parties of $174.3 million and $263.7 million as of September 30, 2018 and December 31, 2017, respectively.
[4]	Corporate includes cash (including restricted cash) of $350.2 million and $336.4 million as of September 30, 2018 and December 31, 2017, respectively. Also included in Corporate at December 31, 2017 is a vessel under construction which has not yet been assigned to a non-corporate reporting segment. A vessel’s construction costs are reported in Corporate until the earlier of the date the vessel is assigned to a non-corporate reporting segment or the date it is delivered. At December 31, 2017,  $9.3 million of vessel construction costs are included in Corporate.

Comparison of Total Assets (Par

Comparison of Total Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018
Segment and Geographic Distribution of Operations [Line Items]
Cash held by non-corporate subsidiaries	$ 230,315	$ 174,349
Cash including restricted cash	21,300	7,466
Corporate
Segment and Geographic Distribution of Operations [Line Items]
Cash including restricted cash	336,400	350,200
Corporate Vessels
Segment and Geographic Distribution of Operations [Line Items]
Construction costs	9,300
Americas
Segment and Geographic Distribution of Operations [Line Items]
Cash held by non-corporate subsidiaries	95,100	100,300
West Africa
Segment and Geographic Distribution of Operations [Line Items]
Due from related parties	$ 263,700	$ 174,300

Schedule of Segment Reporting_3

Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended		3 Months Ended	7 Months Ended		9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017		Sep. 30, 2018	Jul. 31, 2017		Sep. 30, 2018
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 74,300		$ 99,192			$ 296,286
Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 36,263				$ 312,118
Americas Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 9,798	[1]	$ 19,513			$ 58,379	[1]
Percentage of Vessel revenue		14.00%	[1]	20.00%			20.00%	[1]
Americas Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 4,304				$ 84,448	[1]
Percentage of Vessel revenue	12.00%				28.00%	[1]
Americas Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 5,572		$ 6,417			$ 20,824
Percentage of Vessel revenue		8.00%		7.00%			7.00%
Americas Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 3,747				$ 29,759
Percentage of Vessel revenue	11.00%				10.00%
Americas Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 2,079		$ 2,109			$ 7,518
Percentage of Vessel revenue		3.00%		2.00%			3.00%
Americas Fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 910				$ 7,173
Percentage of Vessel revenue	3.00%				2.00%
Americas Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 17,449		$ 28,039			$ 86,721
Percentage of Vessel revenue		25.00%		29.00%			30.00%
Americas Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 8,961				$ 121,380
Percentage of Vessel revenue	26.00%				40.00%
Middle East/Asia Pacific Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 5,726		$ 7,607			$ 26,774
Percentage of Vessel revenue		8.00%		8.00%			9.00%
Middle East/Asia Pacific Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 2,667				$ 22,801
Percentage of Vessel revenue	8.00%				8.00%
Middle East/Asia Pacific Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 10,943		$ 12,156			$ 33,762
Percentage of Vessel revenue		16.00%		12.00%			12.00%
Middle East/Asia Pacific Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 5,880				$ 40,190
Percentage of Vessel revenue	17.00%				13.00%
Middle East/Asia Pacific Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues				$ 164			$ 185
Middle East/Asia Pacific Fleet Other | Maximum
Segment and Geographic Distribution of Operations [Line Items]
Percentage of Vessel revenue				1.00%			1.00%
Middle East/Asia Pacific Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 16,669		$ 19,927			$ 60,721
Percentage of Vessel revenue		24.00%		20.00%			21.00%
Middle East/Asia Pacific Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 8,547				$ 62,991
Percentage of Vessel revenue	25.00%				21.00%
Europe/Mediterranean Sea fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 7,810		$ 11,643			$ 33,260
Percentage of Vessel revenue		11.00%		12.00%			11.00%
Europe/Mediterranean Sea fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 3,383				$ 21,473
Percentage of Vessel revenue	10.00%				7.00%
Europe/Mediterranean Sea fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 1,050		$ 923			$ 2,286
Percentage of Vessel revenue		1.00%		1.00%			1.00%
Europe/Mediterranean Sea fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 1,052				$ 4,167
Percentage of Vessel revenue	3.00%				1.00%
Europe/Mediterranean Sea fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues					$ (9)
Europe/Mediterranean Sea fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 8,860		$ 12,566			$ 35,546
Percentage of Vessel revenue		12.00%		13.00%			12.00%
Europe/Mediterranean Sea fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 4,435				$ 25,631
Percentage of Vessel revenue	13.00%				8.00%
West Africa fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 9,772		$ 15,101			$ 43,354
Percentage of Vessel revenue		14.00%		16.00%			15.00%
West Africa fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 4,205				$ 31,306
Percentage of Vessel revenue	12.00%				10.00%
West Africa fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 13,999		$ 17,805			$ 51,265
Percentage of Vessel revenue		20.00%		18.00%			18.00%
West Africa fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 7,072				$ 53,769
Percentage of Vessel revenue	21.00%				18.00%
West Africa fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 3,822		$ 3,573			$ 11,072
Percentage of Vessel revenue		5.00%		4.00%			4.00%
West Africa fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 1,120				$ 8,424
Percentage of Vessel revenue	3.00%				3.00%
West Africa fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 27,593		$ 36,479			$ 105,691
Percentage of Vessel revenue		39.00%		38.00%			37.00%
West Africa fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 12,397				$ 93,499
Percentage of Vessel revenue	36.00%				31.00%
Worldwide Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 33,106	[1]	$ 53,864			$ 161,767	[1]
Percentage of Vessel revenue		47.00%	[1]	56.00%			55.00%	[1]
Worldwide Fleet Deepwater vessels | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 14,559				$ 160,028	[1]
Percentage of Vessel revenue	42.00%				53.00%	[1]
Worldwide Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 31,564		$ 37,301			$ 108,137
Percentage of Vessel revenue		45.00%		38.00%			38.00%
Worldwide Fleet Towing-Supply/supply | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 17,751				$ 127,885
Percentage of Vessel revenue	52.00%				42.00%
Worldwide Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 5,901		$ 5,846			$ 18,775
Percentage of Vessel revenue		8.00%		6.00%			7.00%
Worldwide Fleet Other | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 2,030				$ 15,588
Percentage of Vessel revenue	6.00%				5.00%
Worldwide Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 70,571	[1]	$ 97,011			$ 288,679	[1]
Percentage of Vessel revenue		100.00%	[1]	100.00%			100.00%	[1]
Worldwide Fleet | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 34,340				$ 303,501	[1]
Percentage of Vessel revenue	100.00%				100.00%	[1]
[1]	Included in Americas fleet deepwater, Worldwide fleet deepwater and Worldwide total vessel revenues for the period January 1, 2017 through July 31, 2017 (Predecessor), is $39.1 million of revenue related to the early cancellation of a long-term vessel charter contract.

Schedule of Segment Reporting_4

Schedule of Segment Reporting Information, Revenue by Vessel Class (Parenthetical) (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Jul. 31, 2017	Sep. 30, 2018
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues		$ 74,300	$ 99,192		$ 296,286
Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 36,263			$ 312,118
Americas Fleet Deepwater Vessels, Worldwide Fleet Deepwater Vessels and Worldwide Fleet Early Cancellation of Long Term Vessel Charter Contract | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues				$ 39,100

Summary of Vessels Impaired and

Summary of Vessels Impaired and Amount of Impairment Incurred (Detail) $ in Thousands	1 Months Ended		3 Months Ended		7 Months Ended		9 Months Ended
	Jul. 31, 2017USD ($)Vessel		Sep. 30, 2018USD ($)Vessel		Jul. 31, 2017USD ($)Vessel		Sep. 30, 2018USD ($)Vessel
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]
Number of vessels impaired in the period | Vessel			15	[1]			30	[2]
Amount of impairment incurred | $			$ 16,853	[3]			$ 24,254	[4]
Predecessor
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]
Number of vessels impaired in the period | Vessel	8	[1]			97	[2]
Amount of impairment incurred | $	$ 21,325	[3]			$ 249,606	[4]
[1]	For the three month period ended September 30, 2018, (Successor) there were 15 stacked vessels impaired. For the period July 1 through July 31, 2017 there were seven stacked vessels and one active vessel impaired.
[2]	For the nine month period ended September 30, 2018, (Successor) there were 30 stacked vessels impaired. For the period January 1 through July 31, 2017 there were 90 stacked vessels and seven active vessels impaired.
[3]	Refer to Note (14) for additional information regarding asset impairment.
[4]	Refer to Note (14) for additional information regarding asset impairment.

Summary of Vessels Impaired a_2

Summary of Vessels Impaired and Amount of Impairment Incurred (Parenthetical) (Detail) - Vessel	1 Months Ended		3 Months Ended		7 Months Ended		9 Months Ended
	Jul. 31, 2017		Sep. 30, 2018		Jul. 31, 2017		Sep. 30, 2018
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]
Number of vessels impaired in the period			15	[1]			30	[2]
Stacked Vessels
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]
Number of vessels impaired in the period			15				30
Predecessor
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]
Number of vessels impaired in the period	8	[1]			97	[2]
Predecessor | Stacked Vessels
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]
Number of vessels impaired in the period	7				90
Predecessor | Active Vessels
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]
Number of vessels impaired in the period	1				7
[1]	For the three month period ended September 30, 2018, (Successor) there were 15 stacked vessels impaired. For the period July 1 through July 31, 2017 there were seven stacked vessels and one active vessel impaired.
[2]	For the nine month period ended September 30, 2018, (Successor) there were 30 stacked vessels impaired. For the period January 1 through July 31, 2017 there were 90 stacked vessels and seven active vessels impaired.

GULFMARK MERGER - Additional In

GULFMARK MERGER - Additional Information (Details) $ in Millions	Jul. 15, 2018USD ($)shares
Business Acquisition [Line Items]
Ownership percentage	74.00%
Fee payable on termination | $	$ 35
GulfMark
Business Acquisition [Line Items]
Shares received upon conversion | shares	1.1
Shares received upon warrant conversion | shares	1.1
Ownership percentage	26.00%
Fee payable on termination | $	$ 13