Seacor (CKH) 10-Q 31 Jul 14 2014 Q2 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 29, 2014
Document And Entity Information [Abstract]	'	'
Entity Registrant Name	'SEACOR HOLDINGS INC /NEW/	'
Entity Central Index Key	'0000859598	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	19,822,438
Entity Well-known Seasoned Issuer	'Yes	'
Entity Voluntary Filers	'No	'
Entity Current Reporting Status	'Yes	'

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current Assets:	'	'
Cash and cash equivalents	$453,415	$527,435
Restricted cash	14,346	12,175
Marketable securities	33,275	24,292
Receivables:	'	'
Trade, net of allowance for doubtful accounts	198,768	215,768
Other Receivables	50,571	48,181
Inventories	20,207	27,615
Deferred income taxes	116	116
Prepaid expenses and other	12,837	6,701
Total current assets	783,535	862,283
Property and Equipment:	'	'
Property, Plant and Equipment, Gross	2,216,627	2,199,183
Accumulated depreciation	888,442	866,330
Property, Plant and Equipment, Net In Service	1,328,185	1,332,853
Construction in Progress, Gross	297,523	143,482
Net property and equipment	1,625,708	1,476,335
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	484,164	440,853
Construction Reserve Funds & Title XI Reserve Funds	324,856	261,739
Goodwill	18,012	17,985
Intangible Assets, Net	10,754	12,423
Other Assets	48,964	44,615
Total assets	3,295,993	3,116,233
Current Liabilities:	'	'
Current portion of long-term debt	43,557	45,323
Accounts payable and accrued expenses	87,235	85,477
Other current liabilities	119,501	123,619
Total current liabilities	250,293	254,419
Long-Term Debt	830,303	834,118
Deferred Income Taxes	456,403	457,827
Deferred Gains and Other Liabilities	175,229	144,441
Total liabilities	1,712,228	1,690,805
SEACOR Holdings Inc. stockholders’ equity:	'	'
Preferred stock, $.01 par value, 10,000,000 shares authorized; none issued nor outstanding	0	0
Common stock, $.01 par value, 60,000,000 shares authorized; 37,458,240 and 37,219,201 shares issued in 2014 and 2013, respectively	375	372
Additional paid-in capital	1,479,942	1,394,621
Retained earnings	1,127,846	1,095,270
Shares held in Treasury of 17,,314,425 and 16,837,113 in 2014 and 2013, respectively, at cost	1,126,322	1,088,219
Accumulated Other Comprehensive Income (Loss), Net of Tax	225	-1,192
Stockholders' equity attributable to parent, total	1,482,066	1,400,852
Noncontrolling interests in subsidiaries	101,699	24,576
Total equity	1,583,765	1,425,428
Liabilities and stockholders' equity, total	$3,295,993	$3,116,233

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Trade receivables, allowance for doubtful accounts	$2,260	$1,162
Common Stock, Par or Stated Value Per Share	$0.01	$0.01
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	37,458,240	37,219,201
Treasury stock, shares	17,314,425	16,837,113
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

Condensed_Consolidated_Stateme

Condensed Consolidated Statements Of Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]	'	'	'	'
Document Period End Date	'	'	30-Jun-14	'
Operating Revenues	$328,224	$315,563	$638,241	$582,627
Costs and Expenses [Abstract]	'	'	'	'
Operating	231,906	240,113	450,882	441,026
Administrative and general	34,686	34,718	72,763	70,363
Depreciation and amortization	33,220	33,783	66,612	67,331
Total costs and expenses	299,812	308,614	590,257	578,720
Gain (Loss) on Sale of Assets and Asset Impairment Charges	4,295	12,305	8,973	14,320
Operating Income (Loss)	32,707	19,254	56,957	18,227
Other Income (Expense):	'	'	'	'
Interest income	6,030	3,218	10,073	6,385
Interest expense	10,458	7,922	21,861	20,762
Marketable security gains, net	731	6,557	5,801	10,552
Derivative losses, net	94	-825	-143	-2,932
Foreign currency losses, net	1,720	-916	1,521	-4,927
Other, net	10,213	195	6,558	198
Total Other Nonoperating Income (Expense)	8,330	307	1,949	-11,486
Income from Continuing Operations Before Income Tax Expense and Equity in Earnings of 50% or Less Owned Companies	41,037	19,561	58,906	6,741
Income Tax Expense (Benefit)	13,000	7,975	19,375	5,322
Income from Continuing Operations Before Equity in Earnings of 50% or Less Owned Companies	28,037	11,586	39,531	1,419
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	-512	7,710	1,709	6,841
Income from Continuing Operations	27,525	19,296	41,240	8,260
Income (Loss) from Discontinued Operations, Net of Tax	0	0	0	-10,325
Net Income (Loss)	27,525	19,296	41,240	-2,065
Net Income (Loss) Attributable to Noncontrolling Interest	6,458	25	8,664	-348
Net Income (Loss) attributable to SEACOR Holdings Inc.	21,067	19,271	32,576	-1,717
Net Income (Loss) attributable to SEACOR Holdings Inc.:	'	'	'	'
Continuing operations	21,067	19,271	32,576	8,508
Discontinued operations, net of tax	0	0	0	-10,225
Net Income (Loss) attributable to SEACOR Holdings Inc.	$21,067	$19,271	$32,576	($1,717)
Basic Earnings Per Common Share of SEACOR Holdings Inc.	'	'	'	'
Continuing operations	$1.05	$0.97	$1.62	$0.43
Discontinued operations	$0	$0	$0	($0.52)
Earnings Per Share, Basic	$1.05	$0.97	$1.62	($0.09)
Diluted Earnings Per Common Share of SEACOR Holdings Inc.	'	'	'	'
Continuing operations	$0.98	$0.91	$1.58	$0.42
Discontinued operations	$0	$0	$0	($0.51)
Earnings Per Share, Diluted	$0.98	$0.91	$1.58	($0.09)
Weighted Average Common Shares Outstanding:	'	'	'	'
Basic	19,989,402	19,825,229	20,049,056	19,782,318
Weighted Average Number of Shares Outstanding, Diluted	24,584,494	24,392,312	24,665,869	20,114,904

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements Of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net Income (Loss)	$27,525	$19,296	$41,240	($2,065)
Other Comprehensive Income (Loss):	'	'	'	'
Reclassification of net foreign currency translation losses to foreign currency gains, net	1,826	-340	2,238	-4,538
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	-11	0	-11	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	50	331	'	'
Other Comprehensive Income (Loss), before Tax	1,967	142	2,419	-3,840
Other Comprehensive Income (Loss), Tax	621	41	763	-1,186
Other Comprehensive Income (Loss), Net of Tax	1,346	101	1,656	-2,654
Comprehensive Income (Loss)	28,871	19,397	42,896	-4,719
Comprehensive Income (Loss) attributable to Noncontrolling Interests in Subsidiaries	6,650	48	8,903	-800
Comprehensive Income (Loss) attributable to SEACOR Holdings Inc.	22,221	19,349	33,993	-3,919
Equity Method Investments [Member]	'	'	'	'
Other Comprehensive Income (Loss):	'	'	'	'
Reclassification of net derivative losses on cash flow hedges to interest expense or equity in earnings of 50% or less owned companies	$102	$151	$215	$318

Condensed_Consolidated_Stateme2

Condensed Consolidated Statement Of Changes In Equity (USD $)	3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'
Total equity	$1,583,765	$1,583,765	$1,425,428
Employee Stock Purchase Plan	'	1,201	'
Exercise of stock options	'	4,916	'
Director stock awards	'	-103	'
Restricted stock	'	170	'
Purchases of treasury shares	'	-39,221	'
Amortization of share awards	'	6,484	'
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures	'	0	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	-3,110	'
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	'	145,690	'
Dividends paid to noncontrolling interests	'	792	'
Comprehensive income:	'	'	'
Net Income attributable to SEACOR Holdings Inc.	21,067	32,576	'
Net Income (Loss) Attributable to Noncontrolling Interest	6,458	8,664	'
Net income	27,525	41,240	'
Other comprehensive income	1,346	1,656	'
Common Stock [Member]	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'
Total equity	375	375	372
Employee Stock Purchase Plan	'	0	'
Exercise of stock options	'	1	'
Director stock awards	'	0	'
Restricted stock	'	2	'
Purchases of treasury shares	'	0	'
Amortization of share awards	'	0	'
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures	'	0	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	0	'
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	'	0	'
Dividends paid to noncontrolling interests	'	0	'
Comprehensive income:	'	'	'
Net Income attributable to SEACOR Holdings Inc.	'	0	'
Other comprehensive income	'	0	'
Additional Paid-In Capital [Member]	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'
Total equity	1,479,942	1,479,942	1,394,621
Employee Stock Purchase Plan	'	0	'
Exercise of stock options	'	4,915	'
Director stock awards	'	-103	'
Restricted stock	'	168	'
Purchases of treasury shares	'	0	'
Amortization of share awards	'	-6,484	'
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures	'	-83	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	-1,242	'
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	'	74,810	'
Dividends paid to noncontrolling interests	'	0	'
Comprehensive income:	'	'	'
Net Income attributable to SEACOR Holdings Inc.	'	0	'
Other comprehensive income	'	0	'
Retained Earnings [Member]	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'
Total equity	1,127,846	1,127,846	1,095,270
Employee Stock Purchase Plan	'	0	'
Exercise of stock options	'	0	'
Director stock awards	'	0	'
Restricted stock	'	0	'
Purchases of treasury shares	'	0	'
Amortization of share awards	'	0	'
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures	'	0	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	0	'
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	'	0	'
Dividends paid to noncontrolling interests	'	0	'
Comprehensive income:	'	'	'
Net Income attributable to SEACOR Holdings Inc.	'	-32,576	'
Other comprehensive income	'	0	'
Shares Held In Treasury [Member]	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'
Total equity	-1,126,322	-1,126,322	-1,088,219
Employee Stock Purchase Plan	'	1,201	'
Exercise of stock options	'	0	'
Director stock awards	'	0	'
Restricted stock	'	0	'
Purchases of treasury shares	'	-39,221	'
Amortization of share awards	'	0	'
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures	'	83	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	0	'
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	'	0	'
Dividends paid to noncontrolling interests	'	0	'
Comprehensive income:	'	'	'
Net Income attributable to SEACOR Holdings Inc.	'	0	'
Other comprehensive income	'	0	'
Accumulated Other Comprehensive Income (Loss) [Member]	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'
Total equity	225	225	-1,192
Employee Stock Purchase Plan	'	0	'
Exercise of stock options	'	0	'
Director stock awards	'	0	'
Restricted stock	'	0	'
Purchases of treasury shares	'	0	'
Amortization of share awards	'	0	'
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures	'	0	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	0	'
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	'	0	'
Dividends paid to noncontrolling interests	'	0	'
Comprehensive income:	'	'	'
Net Income attributable to SEACOR Holdings Inc.	'	0	'
Other comprehensive income	'	-1,417	'
Non-Controlling Interests In Subsidiaries [Member]	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'
Total equity	101,699	101,699	24,576
Employee Stock Purchase Plan	'	0	'
Exercise of stock options	'	0	'
Director stock awards	'	0	'
Restricted stock	'	0	'
Purchases of treasury shares	'	0	'
Amortization of share awards	'	0	'
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures	'	0	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	-1,868	'
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	'	70,880	'
Dividends paid to noncontrolling interests	'	792	'
Comprehensive income:	'	'	'
Net Income (Loss) Attributable to Noncontrolling Interest	'	-8,664	'
Other comprehensive income	'	($239)	'

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements Of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Statement of Cash Flows [Abstract]	'	'
Net Cash Provided by Operating Activities of Continuing Operations	$107,866	$78,235
Cash Flows from Investing Activities of Continuing Operations:	'	'
Purchases of property and equipment	273,669	87,931
Proceeds from disposition of property and equipment	78,039	125,432
Investments in and advances to 50% or less owned companies	21,464	26,822
Return of investments and advances from 50% or less owned companies	10,013	8,315
Principal payments on third party leases and notes receivable, net	6,377	-6,240
Net (increase) decrease in restricted cash	2,171	-11,509
Net (increase) decrease in construction reserve funds and title XI reserve funds	63,117	-45,254
Business acquisitions, net of cash acquired	0	10,540
Net cash used in investing activities of continuing operations	-278,746	71,457
Cash Flows from Financing Activities of Continuing Operations:	'	'
Repayments of Debt and Capital Lease Obligations	7,226	10,027
Net borrowings (repayments) on inventory financing arrangements	6,294	-2,365
Proceeds from issuance of long term debt, net of offering costs	6	6
Common stock acquired for treasury	39,221	0
Cash Received (Paid) For Share Settlements from Spinoff Transactions	0	-357
Proceeds and tax benefits from share award plans	6,288	8,779
Issuance of noncontrolling interests	145,116	40
Purchase of subsidiary shares from noncontrolling interests	2,090	0
Cash received from (dividends paid to) noncontrolling interests, net	-792	-3,276
Net cash provided by (used in) financing activities of continuing operations	95,787	-2,470
Effect of Exchange Rate Changes on Cash and Cash Equivalents	1,073	-2,565
Net Increase (Decrease) in Cash and Cash Equivalents from Continuing Operations	-74,020	144,657
Cash Flows from Discontinued Operations:	'	'
Operating Activities	0	24,298
Investing Activities	0	-8,502
Financing Activities	0	-14,017
Effects of Exchange Rate Changes on Cash and Cash Equivalents	0	143
Net Increase in Cash and Cash Equivalents from Discontinued Operations	0	1,922
Net Increase (Decrease) in Cash and Cash Equivalents	-74,020	146,579
Cash and Cash Equivalents, Beginning of Period	527,435	248,204
Cash and Cash Equivalents, End of Period	$453,415	'

Basis_of_Presentation_and_Acco

Basis of Presentation and Accounting Policy	6 Months Ended
	Jun. 30, 2014
Nature Of Operations And Accounting Policies [Abstract]	'
Basis of Presentation and Accounting Policy	'
	BASIS OF PRESENTATION AND ACCOUNTING POLICY
	The condensed consolidated financial information for the three and six months ended June 30, 2014 and 2013 has been prepared by the Company and has not been audited by its independent registered public accounting firm. The condensed consolidated financial statements include the accounts of SEACOR Holdings Inc. and its consolidated subsidiaries. In the opinion of management, all adjustments (consisting of normal recurring adjustments) have been made to fairly present the Company’s financial position as of June 30, 2014, its results of operations for the three and six months ended June 30, 2014 and 2013, its comprehensive income (loss) for the three and six months ended June 30, 2014 and 2013, its changes in equity for the six months ended June 30, 2014, and its cash flows for the six months ended June 30, 2014 and 2013. Results of operations for the interim periods presented are not necessarily indicative of operating results for the full year or any future periods.
	Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States have been condensed or omitted. These condensed consolidated financial statements should be read in conjunction with the financial statements and related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.
	Unless the context otherwise indicates, any reference in this Quarterly Report on Form 10-Q to the “Company” refers to SEACOR Holdings Inc. and its consolidated subsidiaries and any reference in this Quarterly Report on Form 10-Q to “SEACOR” refers to SEACOR Holdings Inc. Capitalized terms used and not specifically defined herein have the same meaning as such defined terms used in the Company's Annual report on Form 10-K for the year ended December 31, 2013.
	Discontinued Operations (see Note 15). The Company reports disposed businesses as discontinued operations when it has no continuing interest in the business. Discontinued operations includes the historical financial position, results of operations and cash flows of the operations previously reported as discontinued in the Company's Annual Report on Form 10-K for the year ended December 31, 2013.
	Revenue Recognition. The Company recognizes revenue when it is realized or realizable and earned. Revenue is realized or realizable and earned when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price to the buyer is fixed or determinable, and collectability is reasonably assured. Revenue that does not meet these criteria is deferred until the criteria are met. Deferred revenues, included in other current liabilities, for the six months ended June 30, were as follows (in thousands):
		2014				2013
	Balance at beginning of period	$	6,592			$	6,592
	Revenues deferred during the period	202				—
	Balance at end of period	$	6,794			$	6,592
	As of June 30, 2014 and 2013, the Company's deferred revenues related to the time charter of several offshore support vessels scheduled to be paid through the conveyance of an overriding royalty interest (the "Conveyance") in developmental oil and gas producing properties operated by a customer in the U.S. Gulf of Mexico. Payments under the Conveyance, and the timing of such payments, were contingent upon production and energy sale prices. On August 17, 2012, the customer filed a voluntary petition for chapter 11 bankruptcy, which was converted to chapter 7 in June 2014. The Company is vigorously defending its interest in connection with the bankruptcy filing; however, payments received under the Conveyance subsequent to August 17, 2012 and during the 90 days prior to the filing are subject to bankruptcy court approval. The Company will recognize revenues as approved by the bankruptcy court. All costs and expenses related to these charters were recognized as incurred.
	Accumulated Other Comprehensive Income (Loss). The components of accumulated other comprehensive income (loss) were as follows:
			SEACOR Holdings Inc. Stockholders' Equity													Noncontrolling
																Interests
			Foreign				Derivative			Other			Total			Foreign		Other			Other
			Currency				Losses on									Currency					Comprehensive
			Translation				Cash Flow									Translation					Income
			Adjustments				Hedges, net									Adjustments
	31-Dec-13		$	(927	)		$	(257	)	$	(8	)	$	(1,192	)	$	395	$	(5	)
	Other comprehensive income		1,988				192			—			2,180			239		—			$	2,419
	Income tax expense		(696		)		(67		)	—			(763		)	—		—			(763		)
	Six months ended June 30, 2014		$	365			$	(132	)	$	(8	)	$	225		$	634	$	(5	)	$	1,656
	New Accounting Pronouncement. On May 28, 2014, the Financial Accounting Standards Board issued a comprehensive new revenue recognition standard that will supersede nearly all existing revenue recognition guidance under generally accepted accounting principles in the United States. The core principal of the new standard is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The new standard is effective for annual and interim periods beginning after December 15, 2016 and early adoption is prohibited. The Company has not yet determined what impact, if any, the adoption of the new standard will have on its consolidated financial position, results of operations or cash flows.
	Reclassifications. Certain reclassifications of prior period information have been made to conform to the presentation of the current period information. These reclassifications had no effect on net income as previously reported.

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	FAIR VALUE MEASUREMENTS
	The fair value of an asset or liability is the price that would be received to sell an asset or transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company utilizes a fair value hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value and defines three levels of inputs that may be used to measure fair value. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, or inputs derived from observable market data. Level 3 inputs are unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities.
	The Company’s financial assets and liabilities as of June 30, 2014 that are measured at fair value on a recurring basis were as follows (in thousands):
		Level 1			Level 2			Level 3
	ASSETS
	Marketable securities(1)	$	33,275		$	—		$	—
	Derivative instruments (included in other receivables)	2,012			4,442			—
	Construction reserve funds and Title XI reserve funds	324,856			—			—
	LIABILITIES
	Short sale of marketable securities (included in other current liabilities)	10,061			—			—
	Derivative instruments (included in other current liabilities)	2,043			1,016			—
	______________________
	-1	Marketable security gains, net include unrealized gains of $0.7 million and $6.5 million for the three months ended June 30, 2014 and 2013, respectively, related to marketable security positions held by the Company as of June 30, 2014. Marketable security gains, net include unrealized gains of $5.7 million and $10.5 million for the six months ended June 30, 2014 and 2013, respectively, related to marketable security positions held by the Company as of June 30, 2014.
	The estimated fair values of the Company’s other financial assets and liabilities as of June 30, 2014 were as follows (in thousands):
					Estimated Fair Value
		Carrying			Level 1			Level 2			Level 3
		Amount
	ASSETS
	Cash, cash equivalents and restricted cash	$	467,761		$	467,761		$	—		$	—
	Investments, at cost, in 50% or less owned companies (included in other	9,331			see below
	assets)
	Notes receivable from third parties (included in other receivables and other assets)	20,228			see below
	LIABILITIES
	Long-term debt, including current portion(1)	873,860			—			1,055,228			—
	______________________
	-1	The estimated fair value includes the conversion options on the Company's 2.5% and 3.0% Convertible Senior Notes.
	The carrying value of cash, cash equivalents and restricted cash approximates fair value. The fair value of the Company’s long-term debt was estimated based upon quoted market prices or by using discounted cash flow analyses based on estimated current rates for similar types of arrangements. It was not practicable to estimate the fair value of the Company’s investments, at cost, in 50% or less owned companies because of the lack of quoted market prices and the inability to estimate fair value without incurring excessive costs. It was not practicable to estimate the fair value of the Company’s notes receivable from third parties as the overall returns are uncertain due to certain provisions for additional payments contingent upon future events. Considerable judgment was required in developing certain of the estimates of fair value and, accordingly, the estimates presented herein are not necessarily indicative of the amounts that the Company could realize in a current market exchange.
	The Company’s non-financial assets and liabilities that were measured at fair value during the six months ended June 30, 2014 were as follows (in thousands):
			Level 1			Level 2			Level 3
	ASSETS
	Long-lived assets held for sale(1)		$	—		$	11,700		$	—
	______________________
	-1	During the six months ended June 30, 2014, the Company recognized impairment charges of $3.9 million related to two aircraft following the adjustment of their carrying value to fair value based on the expected sales price of each.

Derivative_Instruments_And_Hed

Derivative Instruments And Hedging Strategies	6 Months Ended
	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments And Hedging Strategies	'
	DERIVATIVE INSTRUMENTS AND HEDGING STRATEGIES
	Derivative instruments are classified as either assets or liabilities based on their individual fair values. Derivative assets and liabilities are included in other receivables and other current liabilities, respectively, in the accompanying condensed consolidated balance sheets. The fair values of the Company’s derivative instruments as of June 30, 2014 were as follows (in thousands):
		Derivative			Derivative
		Asset			Liability
	Forward currency exchange, option and future contracts	$	92		$	60
	Interest rate swap agreements	—			998
	Commodity swap, option and future contracts:
	Exchange traded	2,012			1,983
	Non-exchange traded	4,350			18
		$	6,454		$	3,059
	Cash Flow Hedges. As of June 30, 2014, the Company had no interest rate swap agreements designated as cash flow hedges. As of June 30, 2014, one of the Company’s Offshore Marine Services 50% or less owned companies had an interest rate swap agreement maturing in 2015 that has been designated as a cash flow hedge. This instrument calls for this company to pay a fixed interest rate of 1.48% on the amortized notional value of $16.1 million and receive a variable interest rate based on LIBOR on the amortized notional value. Subsequent to June 30, 2014, this interest rate swap was dedesignated. As of June 30, 2014, one of the Company’s Inland River Services 50% or less owned companies had two interest rate swap agreements with maturities in 2015 that have been designated as cash flow hedges. These instruments call for this company to pay fixed rates of interest ranging from 1.53% to 1.62% on the aggregate amortized notional value of $18.8 million and receive a variable interest rate based on LIBOR on the aggregate amortized notional value. Additionally, as of June 30, 2014, one of the Company’s Shipping Services 50% or less owned companies had an interest rate swap agreement maturing in 2017 that has been designated as a cash flow hedge. The instrument calls for this company to pay a fixed interest rate of 2.79% on the amortized notional value of $36.2 million and received a variable interest rate based on LIBOR on the amortized notional value. By entering into these interest rate swap agreements, the Company's 50% or less owned companies have converted the variable LIBOR component of certain of their outstanding borrowings to a fixed interest rate.
	Other Derivative Instruments. The Company recognized gains (losses) on derivative instruments not designated as hedging instruments for the six months ended June 30 as follows (in thousands):
		2014			2013
	Options on equities and equity indices	$	22		$	(3,012	)
	Forward currency exchange, option and future contracts	187			(592		)
	Interest rate swap agreements	(135		)	237
	Commodity swap, option and future contracts:
	Exchange traded	950			(821		)
	Non-exchange traded	(1,167		)	1,256
		$	(143	)	$	(2,932	)
	The Company holds positions in publicly traded equity options that convey the right or obligation to engage in a future transaction on the underlying equity security or index. The Company’s investment in equity options primarily includes positions in energy, marine, transportation and other related businesses. These contracts are typically entered into to mitigate the risk of changes in the market value of marketable security positions that the Company is either about to acquire, has acquired or is about to dispose of.
	The Company enters and settles forward currency exchange, option and future contracts with respect to various foreign currencies. As of June 30, 2014, the outstanding forward currency exchange contracts translated into a net purchase of foreign currencies with an aggregate U.S. dollar equivalent of $4.7 million. These contracts enable the Company to buy currencies in the future at fixed exchange rates, which could offset possible consequences of changes in currency exchange rates with respect to the Company’s business conducted outside of the United States. The Company generally does not enter into contracts with forward settlement dates beyond twelve to eighteen months.
	The Company has entered into various interest rate swap agreements with maturities ranging from 2014 through 2018 that call for the Company to pay fixed interest rates ranging from 3.00% to 3.05% on an aggregate amortized notional value of $34.5 million and receive a variable interest rate based on LIBOR or Euribor on these aggregate amortized notional values. As of June 30, 2014, one of the Company’s Offshore Marine Services 50% or less owned companies has an interest rate swap agreement maturing in 2018 that calls for this company to pay a fixed interest rate of 1.30% on the amortized notional value of $98.3 million and receive a variable interest rate based on LIBOR on the amortized notional value. Additionally, another one of the Company's Offshore Marine Services 50% or less owned companies has two interest rate swap agreements maturing in 2020 that call for this company to pay fixed interest rates ranging from 1.89% to 2.27% on the aggregate amortized notional value of $24.9 million and receive a variable interest rate based on LIBOR on the amortized notional value. As of June 30, 2014, one of the Company's Shipping Services 50% or less owned companies has six interest rate swap agreements with maturities ranging from 2018 to 2020 that call for this company to pay fixed rates of interest ranging from 2.96% to 5.40% on the aggregate amortized notional value of $126.0 million and receive a variable interest rate based on LIBOR on the aggregate amortized notional value. The general purpose of these interest rate swap agreements is to provide protection against increases in interest rates, which might lead to higher interest costs for the Company or its 50% or less owned companies.
	The Company enters and settles positions in various exchange and non-exchange traded commodity swap, option and future contracts. ICP enters into exchange traded positions (primarily corn) to protect its raw material and finished goods inventory balance from market changes. In the Company’s agricultural commodity trading and logistics business, fixed price future purchase and sale contracts for sugar are included in the Company’s non-exchange traded derivative positions. The Company enters into exchange traded positions to protect these purchase and sale contracts as well as its inventory balances from market changes. As of June 30, 2014, the net market exposure to corn and sugar under these contracts was not material. The Company also enters into exchange traded positions (primarily natural gas, heating oil, crude oil, gasoline, corn and sugar) to provide value to the Company should there be a sustained decline in the price of commodities that could lead to a reduction in the market values and cash flows of the Company’s Offshore Marine Services, Inland River Services and Shipping Services businesses. As of June 30, 2014, none of these types of positions were outstanding.

Business_Acquisitions

Business Acquisitions	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Business Acquisitions	'
	BUSINESS ACQUISITIONS
	C-Lift Acquisition. On June 6, 2013, the Company acquired a controlling interest in C-Lift through the acquisition of its partner's 50% equity interest for $13.3 million in cash. C-Lift owned and operated two liftboats in the U.S. Gulf of Mexico. The Company performed a fair value analysis and the purchase price was allocated to the acquired assets and liabilities based on their fair values resulting in no goodwill being recorded. The preliminary fair value analysis was finalized in March 2014.
	Witt O'Brien's. Subsequent to June 30, 2014, the Company acquired a controlling interest in Witt O'Brien's, a global leader in preparedness, crisis management, and disaster response and recovery, through the acquisition of its partner's 45.8% equity interest for $35.4 million (see Note 6).

Equipment_Acquisitions_Disposi

Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies	6 Months Ended
	Jun. 30, 2014
Equipment Acquisitions, Dispositions And Depreciation And Impairment Policies [Abstract]	'
Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies	'
	EQUIPMENT ACQUISITIONS, DISPOSITIONS AND DEPRECIATION AND IMPAIRMENT POLICIES
	During the six months ended June 30, 2014, capital expenditures were $273.7 million, including $148.3 million of progress payments toward the construction of three U.S.-flag product tankers. Equipment deliveries during the period included two crew boats, one supply boat, one wind farm utility vessel, 65 inland river dry-cargo barges and one inland river towboat.
	During the six months ended June 30, 2014, the Company sold five crew boats, three supply boats, one wind farm utility vessel, one U.S.-flag product tanker, which was leased back, one foreign-flag short-sea container/RORO vessel and other property and equipment for net proceeds of $100.9 million ($75.3 million in cash and $25.6 million in seller financing) and gains of $50.6 million, of which $10.2 million were recognized currently and $40.4 million were deferred. In addition, the Company recognized previously deferred gains of $2.7 million. The Company also received deposits of $2.7 million related to future offshore support vessel sales.
	The Company has sold certain equipment to its 50% or less owned companies, entered into vessel sale-leaseback transactions with finance companies, and provided seller financing on sales of its equipment to third parties and its 50% or less owned companies. A portion of the gains realized from these transactions were deferred and recorded in deferred gains and other liabilities in the accompanying condensed consolidated balance sheets. Deferred gain activity related to these transactions for the six months ended June 30 was as follows (in thousands):
		2014			2013
	Balance at beginning of period	$	124,763		$	111,514
	Adjustments to deferred gains arising from asset sales	40,445			2,289
	Amortization of deferred gains included in operating expenses as a reduction to rental expense	(7,155		)	(5,192		)
	Amortization of deferred gains included in gains on asset dispositions and impairments, net	(2,656		)	(1,431		)
	Balance at end of period	$	155,397		$	107,180
	Equipment, stated at cost, is depreciated using the straight-line method over the estimated useful life of the asset to an estimated salvage value. With respect to each class of asset, the estimated useful life is based upon a newly built asset being placed into service and represents the point at which it is typically not justifiable for the Company to continue to operate the asset in the same or similar manner. From time to time, the Company may acquire older assets that have already exceeded the Company’s useful life policy, in which case the Company depreciates such assets based on its best estimate of remaining useful life, typically the next survey or certification date.
	As of June 30, 2014, the estimated useful life (in years) of each of the Company’s major categories of new equipment was as follows:
	Offshore support vessels (excluding wind farm utility)	20
	Wind farm utility vessels	10
	Inland river dry-cargo and deck barges	20
	Inland river liquid tank barges	25
	Inland river towboats	25
	U.S.-flag product tankers	25
	Short-sea Container/RORO(1) vessels	20
	Harbor tugs	25
	Ocean liquid tank barges	25
	Terminal and manufacturing facilities	20
	______________________
	-1	Roll on/Roll off ("RORO").
	The Company performs an impairment analysis of long-lived assets used in operations, including intangible assets, when indicators of impairment are present. If the carrying value of the assets is not recoverable, as determined by the estimated undiscounted cash flows, the carrying value of the assets is reduced to fair value. Generally, fair value is determined using valuation techniques, such as expected discounted cash flows or appraisals, as appropriate. During the six months ended June 30, 2014, the Company recognized impairment charges of $3.9 million related to two aircraft.

Investments_At_Equity_And_Adva

Investments, At Equity, And Advances To 50% Or Less Owned Companies	6 Months Ended
	Jun. 30, 2014
Equity Method Investment, Summarized Financial Information [Abstract]	'
Investments, At Equity, And Advances To 50% Or Less Owned Companies	'
	INVESTMENTS, AT EQUITY, AND ADVANCES TO 50% OR LESS OWNED COMPANIES
	Mexmar. Mexmar operates offshore support vessels in Mexico. During the six months ended June 30, 2014, Mexmar purchased two offshore support vessels from the Company for $32.0 million ($6.4 million in cash and $25.6 million in seller financing). During the six months ended June 30, 2014, Mexmar repaid $2.6 million of the seller financing.
	OSV Partners. OSV Partners was formed to own and operate six offshore support vessels. During the six months ended June 30, 2014, the Company contributed additional capital of $1.6 million to fund certain capital acquisitions. During the six months ended June 30, 2014, OSV Partners purchased one offshore support vessel from the Company for $13.5 million in cash.
	SCFCo Holdings. SCFCo Holdings was established to operate towboats and dry-cargo barges on the Parana-Paraguay Rivers and a terminal facility at Port Ibicuy, Argentina. During the six months ended June 30, 2014, the Company and its partner each contributed additional capital of $12.2 million. As of June 30, 2014, the Company had outstanding loans to SCFCo Holdings of $3.7 million.
	SeaJon. SeaJon owns an articulated tug-barge operating in the Great Lakes trade. During the six months ended June 30, 2014, the Company and its partner each contributed additional capital of $1.3 million to fund certain capital acquisitions.
	Avion. Avion is a distributor of aircraft and aircraft related parts. During the six months ended June 30, 2014, Avion repaid $4.0 million of outstanding notes to the Company.
	Witt-O'Brien's. Witt-O'Brien's is a global leader in preparedness, crisis management, and disaster response and recovery. During the six months ended June 30, 2014, the Company received distributions of $0.8 million from Witt-O'Brien's. Subsequent to June 30, 2014, the Company acquired a controlling interest in Witt-O'Brien's through the acquisition of its partner's 45.8% equity interest for $35.4 million (see Note 4).
	Cleancor. On August 20, 2013, CLEANCOR Energy Solutions LLC ("Cleancor") was established to be a full service solution provider delivering clean fuel to end users. During the six months ended June 30, 2014, the Company contributed capital of $4.8 million to Cleancor to fund its start-up operations and provide capital for future investments.
	Other. During the six months ended June 30, 2014, the Company received a capital distribution of $2.1 million from one of Inland River Services' 50% or less owned companies, loaned $0.7 million to one of Offshore Marine Services' 50% or less owned companies and contributed capital of $0.2 million and loaned $0.3 million to certain of its industrial aviation businesses in Asia.
	Guarantees. The Company has guaranteed the payment of amounts owed by one of its 50% or less owned companies under a vessel charter and has guaranteed amounts owed under banking facilities by certain of its 50% or less owned companies. As of June 30, 2014, the total amount guaranteed by the Company under these arrangements was $15.3 million. In addition, as of June 30, 2014, the Company had uncalled capital commitments to two of its 50% or less owned companies for a total of $2.4 million. Subsequent to June 30, 2014, the Company's guarantees increased by $19.0 million after certain of the Company's 50% or less owned companies obtained bank financing.

Commitments_And_Contingencies

Commitments And Contingencies	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments And Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	As of June 30, 2014, the Company's unfunded capital commitments were $412.8 million and included: $86.5 million for 13 offshore support vessels; $1.1 million for two inland river tank barges; $4.6 million for four inland river towboats; $230.2 million for three U.S.-flag product tankers; $78.4 million for one U.S.-flag articulated tug-barge; and $12.0 million for other equipment and improvements. These commitments are payable as follows: $99.7 million is payable during the remainder of 2014; $303.8 million is payable during 2015-2016; and $9.3 million is payable during 2017.
	On July 20, 2010, two individuals purporting to represent a class commenced a civil action in the Civil District Court for the Parish of Orleans in the State of Louisiana, John Wunstell, Jr. and Kelly Blanchard v. BP, et al., No. 2010-7437 (Division K) (the “Wunstell Action”), in which they assert, among other theories, that Mr. Wunstell suffered injuries as a result of his exposure to certain noxious fumes and chemicals in connection with the provision of remediation, containment and response services by ORM, a subsidiary of the Company prior to the ORM Transaction, during the Deepwater Horizon oil spill response and clean-up in the U.S Gulf of Mexico. The action now is part of the overall multi-district litigation, In re Oil Spill by the Oil Rig "Deepwater Horizon", MDL No. 2179 filed in the U.S. District Court for the Eastern District of Louisiana ("MDL"). The complaint also seeks to establish a “class-wide court-supervised medical monitoring program” for all individuals “participating in BP's Deepwater Horizon Vessels of Opportunity Program and/or Horizon Response Program” who allegedly experienced injuries similar to those of Mr. Wunstell. The Company believes this lawsuit has no merit and will continue to vigorously defend the action and pursuant to contractual agreements with the responsible party, the responsible party has agreed, subject to certain potential limitations, to indemnify and defend ORM in connection with the Wunstell Action and claims asserted in the MDL, discussed further below. Although the Company is unable to estimate the potential exposure, if any, resulting from this matter, the Company does not expect it will have a material effect on the Company's consolidated financial position, results of operations or cash flows.
	On December 15, 2010, ORM and NRC, subsidiaries of the Company prior to the ORM Transaction and SES Business Transaction, respectively, were named as defendants in one of the several consolidated “master complaints” that have been filed in the overall MDL. The master complaint naming ORM and NRC asserts various claims on behalf of a putative class against multiple defendants concerning the clean-up activities generally, and the use of dispersants specifically. By court order, the Wunstell Action has been stayed as a result of the filing of the referenced master complaint. The Company believes that the claims asserted against ORM and NRC in the master complaint have no merit and on February 28, 2011, ORM and NRC moved to dismiss all claims against them in the master complaint on legal grounds. On September 30, 2011, the Court granted in part and denied in part the motion to dismiss that ORM and NRC had filed (an amended decision was issued on October 4, 2011 that corrected several grammatical errors and non-substantive oversights in the original order). Although the Court refused to dismiss the referenced master complaint in its entirety at that time, the Court did recognize the validity of the “derivative immunity” and “implied preemption” arguments that ORM and NRC advanced and directed ORM and NRC to (i) conduct limited discovery to develop evidence to support those arguments and (ii) then re-assert the arguments. The Court did, however, dismiss all state-law claims and certain other claims that had been asserted in the referenced master complaint, and dismissed the claims of all plaintiffs that have failed to allege a legally-sufficient injury. A schedule for limited discovery and motion practice was established by the Court and, in accordance with that schedule, ORM and NRC filed for summary judgment re-asserting their derivative immunity and implied preemption arguments on May 18, 2012. Those motions were argued on July 13, 2012 and are still pending decision. In addition to the indemnity provided to ORM, pursuant to contractual agreements with the responsible party, the responsible party has agreed, subject to certain potential limitations, to indemnify and defend ORM and NRC in connection with these claims in the MDL. Although the Company is unable to estimate the potential exposure, if any, resulting from this matter, the Company does not expect it will have a material effect on the Company's consolidated financial position, results of operations or cash flows.
	Subsequent to the filing of the referenced master complaint, ten additional individual civil actions have been filed in or removed to the U.S. District Court for the Eastern District of Louisiana concerning the clean-up activities generally, which name the Company, ORM and/or NRC as defendants or third-party defendants and are part of the overall MDL. By court order, all of these additional individuals' cases have been stayed until further notice. On April 8, 2011, ORM was named as a defendant in Johnson Bros. Corporation of Louisiana v. BP, PLC, et al., No. 2:11-CV-00781 (E.D. La.), which is a suit by an individual business seeking damages allegedly caused by a delay on a construction project alleged to have resulted from the clean-up operations. On April 13, 2011, the Company was named as a defendant in Mason v. Seacor Marine, LLC, No. 2:11-CV-00826 (E.D. La.), an action in which plaintiff, a former employee, alleges sustaining personal injuries in connection with responding to the explosion and fire, but also in the months thereafter in connection with the clean-up of oil and dispersants while a member of the crew of the M/V Seacor Vanguard. Although the case is subject to the MDL Court’s stay of individual proceedings, the employee moved to sever his case from the MDL on July 16, 2012, which the Court denied on March 5, 2013. The employee filed a motion asking the Court to reconsider, which was denied on May 3, 2013, and the employee filed a Notice of Appeal to the U.S. Court of Appeals for the Fifth Circuit (“Fifth Circuit”) on May 22, 2013. On July 24, 2013, the Company filed a motion to dismiss for lack of appellate jurisdiction, which was granted on August 16, 2013. The same company employee has also brought a claim in the M/V Seacor Vanguard vessel’s limitation action in the MDL which relates to any actions that may have been taken by vessels owned by the Company to extinguish the fire. On April 15, 2011, ORM and NRC were named as defendants in James and Krista Pearson v. BP Exploration & Production, Inc. ("BP Exploration"), et al., No. 2:11-CV-00863 (E.D. La.), which is a suit by a husband and wife, who allegedly participated in the clean-up effort and are seeking damages for personal injury, property damage to their boat, and amounts allegedly due under contract. On April 15, 2011, ORM and NRC were named as defendants in Thomas Edward Black v. BP Exploration, et al., No. 2:11-CV-00867 (E.D. La.), which is a suit by an individual who is seeking damages for lost income because he allegedly could not find work in the fishing industry after the oil spill. On April 20, 2011, a complaint was filed in Darnell Alexander, et al. v. BP, PLC, et al., No. 2:11-CV-00951 (E.D. La.) on behalf of 117 individual plaintiffs that seek to adopt the allegations made in the referenced master complaint against ORM and NRC (and the other defendants). Plaintiffs in this matter have since been granted leave to amend their complaint to include 410 additional individual plaintiffs. On October 3, 2012, ORM and NRC were served with a Rule 14(c) Third-Party Complaint by Jambon Supplier II, L.L.C. and Jambon Marine Holdings L.L.C. in their Limitation of Liability action, In the Matter of Jambon Supplier II, L.L.C., et al., No. 2:12-CV-00426 (E.D. La.). This Third-Party Complaint alleges that if claimant David Dinwiddie, who served as a clean-up crewmember aboard the M/V JAMBON SUPPLIER II vessel during the clean-up efforts, was injured as a result of his exposure to dispersants and chemicals during the course and scope of his employment, then said injuries were caused by the third-party defendants. On November 25, 2012, ORM was named as a defendant in Victoria Sanchez v. American Pollution Control Corp. et al., No. 2:12-CV-00164 (E.D. La.), a maritime suit filed by an individual who allegedly participated in the clean-up effort and sustained personal injuries during the course of such employment. On December 17, 2012, the Court unsealed a False Claims Act lawsuit naming ORM as a defendant, Dillon v. BP, PLC et al., No. 2:12-CV-00987 (E.D. La.)., which is a suit by an individual seeking damages and penalties arising from alleged false reports and claims made to the federal government with respect to the amount of oil burned and dispersed during the clean-up. The federal government has declined to intervene in this suit. On April 8, 2013, the Company, ORM, and NRC were named as defendants in William and Dianna Fitzgerald v. BP Exploration et al., No. 2:13-CV-00650 (E.D. La.), which is a suit by a husband and wife whose son allegedly participated in the clean-up effort and became ill as a result of his exposure to oil and dispersants. Finally, on April 17, 2013, ORM was named as a defendant in Danos et al. v. BP America Production Co. et al., No. 2:13-CV-03747 (removed to E.D. La.), which is a suit by eight individuals seeking damages for dispersant exposure either as a result of their work during clean-up operations or as a result of their residence in the Gulf. The Company is unable to estimate the potential exposure, if any, resulting from these matters but believes they are without merit and does not expect that they will have a material effect on its consolidated financial position, results of operations or cash flows.
	On February 18, 2011, Triton Asset Leasing GmbH, Transocean Holdings LLC, Transocean Offshore Deepwater Drilling Inc., and Transocean Deepwater Inc. (collectively “Transocean”) named ORM and NRC as third-party defendants in a Rule 14(c) Third-Party Complaint in Transocean's own Limitation of Liability Act action, which is part of the overall MDL, tendering to ORM and NRC the claims in the referenced master complaint that have already been asserted against ORM and NRC. Transocean, Cameron International Corporation, Halliburton Energy Services, Inc., and M-I L.L.C. also filed cross-claims against ORM and NRC for contribution and tort indemnity should they be found liable for any damages in Transocean's Limitation of Liability Act action and ORM and NRC have asserted counterclaims against those same parties for identical relief. Weatherford U.S., L.P. and Weatherford International, Inc. (collectively "Weatherford") had also filed cross-claims against ORM and NRC, but moved to voluntarily dismiss these cross-claims without prejudice on February 8, 2013. The Court granted Weatherford's motion that same day. Transcoean's limitation action, and thus the remainder of the aforementioned cross-claims, remains pending. As indicated above, the Company is unable to estimate the potential exposure, if any, resulting from these actions but believes they are without merit and does not expect that these matters will have a material effect on its consolidated financial position, results of operations or cash flows.
	On November 16, 2012, 668 individuals who served as beach clean-up workers in Escambia County, Florida during the Deepwater Horizon oil spill response commenced a civil action in the Circuit Court for the First Judicial Circuit of Florida, in and for Escambia County, Abney et al. v. Plant Performance Services, LLC et al., No. 2012-CA-002947, in which they allege, among other things, that ORM and other defendants engaged in the contamination of Florida waters and beaches in violation of Florida Statutes Chapter 376 and injured the plaintiffs by exposing them to dispersants during the course and scope of their employment. The case was removed to the U.S. District Court for the Northern District of Florida on January 13, 2013, Abney et al. v. Plant Performance Services, LLC et al., No. 3:13-CV-00024 (N.D. Fla.), and on January 16, 2013, the United States Judicial Panel on Multidistrict Litigation (“JPML”) issued a Conditional Transfer Order (“CTO”) transferring the case to the MDL, subject to any timely-filed notice of objection from the plaintiffs. Upon receipt of a notice of objection from the plaintiffs, a briefing schedule was set by the JPML, and so a stay of proceedings and suspension of deadlines was sought and obtained by the Court in the U.S. District Court for the Northern District of Florida. Following briefing before the JPML, the case was transferred to the U.S. District Court for the Eastern District of Louisiana and consolidated with the MDL on April 2, 2013. On April 22, 2013, a companion case to this matter was filed in the U.S. District Court for the Northern District of Florida, Abood et al. v. Plant Performance Services, LLC et al., No. 3:13-CV-00284 (N.D. Fla.), which alleges identical allegations against the same parties but names an additional 174 plaintiffs, all of whom served as clean-up workers in various Florida counties during the Deepwater Horizon oil spill response.  A CTO was issued by the JPML on May 2, 2013, no objection was filed by the plaintiffs, and the case was transferred to the U.S. District Court for the Eastern District of Louisiana and consolidated with the MDL on May 10, 2013.  By court order, both of these matters have been stayed until further notice. The Company is unable to estimate the potential exposure, if any, resulting from these matters but believes they are without merit and does not expect that these matters will have a material effect on its consolidated financial position, results of operations or cash flows.
	Separately, on March 2, 2012, the Court announced that BP Exploration and BP America Production Company ("BP America") (collectively "BP") and the plaintiffs had reached an agreement on the terms of two proposed class action settlements that will resolve, among other things, plaintiffs' economic loss claims and clean-up related claims against BP. The parties filed their proposed settlement agreements on April 18, 2012 along with motions seeking preliminary approval of the settlements. The Court held a hearing on April 25, 2012 to consider those motions and preliminarily approved both settlements on May 2, 2012. A final fairness hearing took place on November 8, 2012. The Court granted final approval to the Economic and Property Damages Class Action Settlement ("E&P Settlement") on December 21, 2012, and granted final approval to the Medical Benefits Class Action Settlement ("Medical Settlement") on January 11, 2013. Both class action settlements were appealed to the Fifth Circuit. The Fifth Circuit affirmed the MDL Court's decision concerning the E&P Settlement on January 10, 2014, and also affirmed the MDL Court's decision concerning the interpretation of the E&P Settlement with respect to business economic loss claims on March 3, 2014. The appeal of the Medical Settlement, on the other hand, was voluntarily dismissed and the Medical Settlement became effective on February 12, 2014. The deadline for bringing a claim to the Medical Benefits Claims Administrator is one year from the effective date of the Settlement. Although neither the Company, ORM, or NRC are parties to the settlement agreements, the Company, ORM, and NRC are listed as released parties on the releases accompanying both settlement agreements. Consequently, barring any further successful appeal, class members who did not file timely requests for exclusion will be barred from pursuing economic loss, property damage, personal injury, medical monitoring, and/or other released claims against the Company, ORM, and NRC. The Company believes these settlements have reduced the Company and ORM's potential exposure, if any, from some of the pending actions described above, and continues to evaluate the settlements' impacts on these cases.
	On January 29, 2013, HEPACO, LLC ("HEPACO"), served a demand for arbitration upon ORM, in which HEPACO claimed that ORM owed HEPACO an additional fee of $20,291,178.92 under the parties' Management Services Agreement (“MSA”), dated June 1, 2010.  HEPACO claimed that the MSA required ORM to pay HEPACO an additional fee of 30% of total charges paid under the MSA ("Surcharge") to compensate HEPACO for U.S. Longshoremen's and Harbor Workers' insurance or Jones Act insurance and related risks attendant to the work when a contract requires labor to be performed over, adjoining and/or in water. On June 23, 2014, ORM and HEPACO entered into an agreement to settle HEPACO's claims in the arbitration without a material impact to the Company's results of operations or cash flows and, on July 2, 2014, the HEPACO arbitration was dismissed with prejudice.
	ORM is defending against two collective action lawsuits, each asserting failure to pay overtime with respect to individuals who provided service on the Deepwater Horizon oil spill response (the “DPH FLSA Actions”) under the Fair Labor Standards Act (“FLSA”).  These cases, Dennis Prejean v. O'Brien's Response Management Inc. (E.D. La., Case No.: 2:12-cv-01045) (the “Prejean Action”) and Himmerite et al. v. O'Brien's Response Management Inc. et al. (E.D. La., Case No.: 2:12-cv-01533) (the “Himmerite Action”), were each brought on behalf of certain individuals who worked on the Deepwater Horizon oil spill response and who were classified as independent contractors.  The Prejean and Himmerite Actions were each filed in the United States District Court for the Eastern District of Louisiana and then subsequently consolidated with the overall MDL, in which the Himmerite Action was stayed pursuant to procedures of the MDL.  However, both the Prejean and Himmerite Actions were severed from the MDL on September 19, 2013, and referred to a Magistrate Judge for pretrial case management, including issuing a scheduling order, overseeing discovery, and any other preliminary matters.  On October 31, 2013, ORM filed an answer in the Himmerite Action.  In the Himmerite Action, pursuant to an earlier tolling order entered by the Court, the limitations periods for potential plaintiffs to opt-in to the action has been tolled pending further action by the Court.  In the Prejean Action, ORM has answered the complaint and a scheduling order has been issued. On November 6, 2013, the Court conditionally certified a collective class in the Prejean Action.  On December 9, 2013 the Court approved a jointly-submitted form notice and authorized the issuance of notice to all members of the conditionally certified class in the Prejean Action. On December 20, 2013, ORM served plaintiffs’ counsel with a list containing information for approximately 330 potential class members in the Prejean Action. The deadline for plaintiffs to file executed consent forms with the Court has expired. As of February 28, 2014 the Court-ordered deadline for potential class members to opt into the class, 142 individuals have opted in. Although the Court has conditionally certified the Prejean class, the Court has not made a final ruling on whether a class exists. The Company intends to vigorously defend its position that a class should not be certified, and intends on filing a motion to decertify the Prejean class. The Court has also not yet ruled on any of the merits of Plaintiffs’ claims. The Company does not expect the potential exposure, if any, resulting from these DPH FLSA Actions will have a material impact on the Company's results of operations or cash flows, but believes the actions are without merit and will continue to vigorously defend against them.
	In a related action, Baylor Singleton et. al. v. O'Brien's Response Management Inc. et. al. (E.D. La., Case No.: 2:12-cv-01716) (the “Singleton Action”), which was also filed in the United States District Court for the Eastern District of Louisiana and in which plaintiffs alleged claims similar to those alleged in the Prejean and Himmerite Actions, the parties reached a full and final settlement agreement on February 13, 2014 with respect to all of the Plaintiff’s individual claims for an undisclosed amount. On April 11, 2014, the Court approved the parties’ settlement and dismissed the Singleton Action with prejudice in its entirety. The Court also ordered that the tolling order which had been entered in the Singleton Action expired as of April 11, 2014.
	In the course of the Company's business, it may agree to indemnify the counterparty to an agreement.  If the indemnified party makes a successful claim for indemnification, the Company would be required to reimburse that party in accordance with the terms of the indemnification agreement.  Indemnification agreements generally are subject to threshold amounts, specified claim periods and other restrictions and limitations.
	In connection with the SES Business Transaction and the ORM Transaction, the Company remains contingently liable for certain obligations, including potential liabilities relating to work performed in connection with the Deepwater Horizon oil spill response. In the case of the SES Business Transaction, such potential liabilities may not exceed the consideration received by the Company for the SES Business Transaction and in the case of the ORM Transaction are subject to a negotiated cap. The Company currently is indemnified under contractual agreements with BP.
	During the six months ended June 30, 2014, the Company received net litigation settlement proceeds of $14.7 million from an equipment supplier relating to the May 2008 mechanical malfunction and fire onboard the SEACOR Sherman, an anchor handling towing supply vessel then under construction.  Upon settlement of the litigation, the Company recognized a gain of $14.7 million, which is included in other income (expense) in the accompanying condensed consolidated statements of income (loss).
	In the normal course of its business, the Company becomes involved in various other litigation matters including, among other things, claims by third parties for alleged property damages and personal injuries. Management has used estimates in determining the Company's potential exposure to these matters and has recorded reserves in its financial statements related thereto where appropriate. It is possible that a change in the Company's estimates of that exposure could occur, but the Company does not expect such changes in estimated costs would have a material effect on the Company's consolidated financial position, results of operations or cash flows.

Multiemployer_Pension_Plans

Multiemployer Pension Plans	6 Months Ended
	Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]	'
Multiemployer Pension Plans	'
	MULTI-EMPLOYER PENSION PLANS
	During the six months ended June 30, 2014, the Company received notification from the American Maritime Officers Pension Plan (the "AMOPP”) that the Company's withdrawal liability as of September 30, 2013 was $46.5 million based on an actuarial valuation performed as of that date. That liability may change in future years based on various factors, primarily employee census. As of June 30, 2014, the Company has no intention to withdraw from the AMOPP and no deficit amounts have been invoiced. Depending upon the results of the future actuarial valuations and the ten-year rehabilitation plan, it is possible that the AMOPP will experience further funding deficits, requiring the Company to recognize additional payroll related operating expenses in the periods invoices are received or contribution levels are increased.

LongTerm_Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2014
Long-term Debt and Capital Lease Obligations [Abstract]	'
Long-Term Debt	'
	LONG-TERM DEBT
	As of June 30, 2014, the Company had outstanding letters of credit totaling $18.2 million with various expiration dates through 2018.
	During the six months ended June 30, 2014, the Company made scheduled payments on long-term debt of $7.2 million and made net repayments of $6.3 million under inventory financing arrangements.
	SEACOR’s Board of Directors has previously authorized the Company to purchase any or all of its 7.375% Senior Notes due 2019, which may be acquired through open market purchases, privately negotiated transactions or otherwise, depending on market conditions. During the six months ended June 30, 2014, the Company did not repurchase any of its 7.375% Senior Notes due 2019.

Stock_Repurchases

Stock Repurchases	6 Months Ended
	Jun. 30, 2014
Stock Repurchases [Abstract]	'
Stock Repurchases	'
	STOCK REPURCHASES
	SEACOR’s Board of Directors previously approved a securities repurchase plan that authorizes the Company to acquire shares of SEACOR common stock, par value $0.01 per share (“Common Stock”), which may be acquired through open market purchases, privately negotiated transactions or otherwise, depending on market conditions. During the six months ended June 30, 2014, the Company acquired 493,032 shares of Common Stock for treasury for an aggregate purchase price of $39.2 million. As of June 30, 2014, the remaining authority under the repurchase plan was $60.8 million.
	On June 20, 2014, the Company executed a purchase agreement whereby the Company appointed Goldman, Sachs & Co. as broker to purchase Common Stock in compliance with the requirements of Rule 10b5-1(c)(l)(i) for the period June 19, 2014 through August 4, 2014. Subsequent to June 30, 2014 and through July 29, 2014, the Company purchased 321,377 shares of Common Stock for treasury for an aggregate purchase price of $25.4 million. Effective July 31, 2014, SEACOR’s Board of Directors increased the Company's authority to repurchase Common Stock to $150.0 million.

Noncontrolling_Interests_in_Su

Noncontrolling Interests in Subsidiaries (Notes)	6 Months Ended
	Jun. 30, 2014
Noncontrolling Interest [Abstract]	'
Noncontrolling Interests in Subsidiaries Disclosure [Text Block]	'
	11	NONCONTROLLING INTERESTS IN SUBSIDIARIES
	Noncontrolling interests in the Company's consolidated subsidiaries were as follows (amounts in thousands except noncontrolling interests' percentages):
		Noncontrolling Interests				30-Jun-14		December 31, 2013
	Offshore Marine Services:
	Windcat Workboats Ltd.	25%				$	7,761	$	7,541
	Other	1.8	%	–	33.30%	1,233		1,600
	Inland River Services:
	Other	3	%	–	51.80%	1,204		2,612
	Shipping Services:
	Sea-Vista	49%				72,886		—
	Illinois Corn Processing	30%				16,864		10,894
	Other	5	%	–	18.90%	1,751		1,929
						$	101,699	$	24,576
	Windcat Workboats. Windcat Workboats Holdings Ltd. (“Windcat Workboats”) owns and operates the Company’s wind farm utility vessels that are primarily used to move personnel and supplies in the major offshore wind markets of Europe. As of June 30, 2014, the net assets of Windcat Workboats were $31.0 million. During the six months ended June 30, 2014, the net loss of Windcat Workboats was $0.1 million and the amount attributable to the noncontrolling interest was not material. During the six months ended June 30, 2013, the net loss of Windcat Workboats was $2.7 million, of which $0.7 million was attributable to noncontrolling interests.
	SEA-Vista. On May 2, 2014, the Company issued a 49% noncontrolling interest to a financial investor in certain of its subsidiaries (collectively "SEA-Vista") that own and operate the Company's fleet of U.S.-flag product tankers used in the U.S. coastwise trade of crude oil, petroleum and specialty chemical products for $145.7 million, net of $3.2 million in issue costs. SEA-Vista also holds the Company's contracts for the construction of three 50,000 DWT (deadweight tonnage) product tankers with expected deliveries in May 2016, October 2016 and March 2017, as well as its Title XI bonds payable and reserve funds and certain other working capital. The Company has evaluated the noncontrolling interest's protective rights in SEA-Vista, its ownership interest, and the underlying terms and conditions that govern SEA-Vista's operations and determined that the Company controls SEA-Vista. As a result, the Company has consolidated the financial position, operating results and cash flows of SEA-Vista. As of June 30, 2014, the net assets of SEA-Vista were $148.7 million. From May 2, 2014 through June 30, 2014, the net income of SEA-Vista was $4.1 million, of which $2.0 million was attributable to noncontrolling interests.
	Illinois Corn Processing. Illinois Corn Processing LLC (“ICP”) owns and operates an alcohol manufacturing, storage and distribution facility located in Pekin, IL. As of June 30, 2014, the net assets of ICP were $62.5 million. During the six months ended June 30, 2014, the net income of ICP was $23.8 million, of which $6.0 million was attributable to noncontrolling interests. During the six months ended June 30, 2013, the net loss of ICP was $3.5 million, of which $1.3 million was attributable to noncontrolling interests.
	For the twelve months ending March 31, 2014, the noncontrolling member of ICP had invoked a plant shutdown election that is available to each LLC member under certain circumstances; however, under its member rights, the Company elected to keep the plant in operation. As a result, the earnings and losses of ICP were disproportionately allocated to its members during the plant shutdown election period. Effective April 1, 2014, the noncontrolling member of ICP withdrew its plant shutdown election.
	Inland River Services. During the six months ended June 30, 2014, the Company acquired the noncontrolling interest in one of its Inland River Services partnerships for $3.1 million ($2.1 million in cash and $1.0 million through the distribution of an inland river towboat to the noncontrolling interest holder).

Earnings_Per_Common_Share_of_S

Earnings Per Common Share of SEACOR	6 Months Ended
	Jun. 30, 2014
Earnings Per Common Share of SEACOR [Abstract]	'
Earnings Per Common Share of SEACOR	'
	EARNINGS PER COMMON SHARE OF SEACOR
	Basic earnings per common share of SEACOR are computed based on the weighted average number of common shares issued and outstanding during the relevant periods. Diluted earnings per common share of SEACOR are computed based on the weighted average number of common shares issued and outstanding plus the effect of potentially dilutive securities through the application of the treasury stock and if-converted methods. Dilutive securities for this purpose assumes restricted stock grants have vested, common shares have been issued pursuant to the exercise of outstanding stock options and common shares have been issued pursuant to the conversion of all outstanding convertible notes.
	Computations of basic and diluted earnings per common share of SEACOR were as follows (in thousands, except share data):
		Three Months Ended June 30,					Six Months Ended June 30,
		Net Income Attributable to SEACOR		Average O/S Shares	Per Share		Net Income (Loss) Attributable to SEACOR			Average O/S Shares	Per Share
	2014
	Basic Weighted Average Common Shares Outstanding	$	21,067	19,989,402	$	1.05	$	32,576		20,049,056	$	1.62
	Effect of Dilutive Share Awards:
	Options and Restricted Stock(1)	—		394,567			—			416,288
	Convertible Notes(2)	3,148		4,200,525			6,287			4,200,525
	Diluted Weighted Average Common Shares Outstanding	$	24,215	24,584,494	$	0.98	$	38,863		24,665,869	$	1.58
	2013
	Basic Weighted Average Common Shares Outstanding	$	19,271	19,825,229	$	0.97	$	(1,717	)	19,782,318	$	(0.09	)
	Effect of Dilutive Share Awards:
	Options and Restricted Stock(1)	—		366,558			—			332,586
	Convertible Notes(3)	3,044		4,200,525			—			—
	Diluted Weighted Average Common Shares Outstanding	$	22,315	24,392,312	$	0.91	$	(1,717	)	20,114,904	$	(0.09	)
	______________________
	-1	For the three months ended June 30, 2014 and 2013, diluted earnings per common share of SEACOR excluded 365,398 and 355,490 of certain share awards, respectively, as the effect of their inclusion in the computation would be anti-dilutive. For the six months ended June 30, 2014 and 2013, diluted earnings per common share of SEACOR excluded 288,510 and 503,726 of certain share awards, respectively, as the effect of their inclusion in the computation would be anti-dilutive.
	-2	For the three and six months ended June 30, 2014, diluted earnings per common share of SEACOR excluded 1,825,326 common shares issuable pursuant to the Company's 3.0% Convertible Senior Notes as the effect of their inclusion in the computation would be anti-dilutive.
	-3	For the six months ended June 30, 2013, diluted earnings per common share of SEACOR excluded 4,200,525 common shares issuable pursuant to the Company's 2.5% Convertible Senior Notes as the effect of their inclusion in the computation would be anti-dilutive.

Share_Based_Compensation

Share Based Compensation	6 Months Ended
	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Share Based Compensation	'
	SHARE BASED COMPENSATION
	Transactions in connection with the Company’s share based compensation plans during the six months ended June 30, 2014 were as follows:
	Director stock awards granted	1,250
	Employee Stock Purchase Plan (“ESPP”) shares issued	16,720
	Restricted stock awards granted	147,645
	Restricted stock awards canceled	1,000
	Shares released from Deferred Compensation Plan	—
	Stock Option Activities:
	Outstanding as of December 31, 2013	1,481,280
	Granted	106,925
	Exercised	(90,144	)
	Outstanding as of June 30, 2014	1,498,061
	Shares available for future grants and ESPP purchases as of June 30, 2014	1,236,955

Segment_Information

Segment Information	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	SEGMENT INFORMATION
	Accounting standards require public business enterprises to report information about each of their operating business segments that exceed certain quantitative thresholds or meet certain other reporting requirements. Operating business segments have been defined as components of an enterprise about which separate financial information is available and is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and in assessing performance. The Company’s segment presentation and basis of measurement of segment profit or loss are as previously described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.
	The following tables summarize the operating results, capital expenditures and assets of the Company's reportable segments.
		Offshore		Inland		Shipping		ICP		Other		Corporate		Total
		Marine		River		Services		$’000		$’000		and		$’000
		Services		Services		$’000						Eliminations
		$’000		$’000								$’000
	For the three months ended
	30-Jun-14
	Operating Revenues:
	External customers	138,214		55,200		53,575		72,798		8,437		—		328,224
	Intersegment	33		807		—		—		—		(840	)	—
		138,247		56,007		53,575		72,798		8,437		(840	)	328,224
	Costs and Expenses:
	Operating	93,755		45,047		28,018		56,429		9,464		(807	)	231,906
	Administrative and general	13,426		3,835		5,421		594		3,449		7,961		34,686
	Depreciation and amortization	16,448		7,564		7,115		1,010		82		1,001		33,220
		123,629		56,446		40,554		58,033		12,995		8,155		299,812
	Gains (Losses) on Asset Dispositions	3,526		810		(41	)	—		—		—		4,295
	Operating Income (Loss)	18,144		371		12,980		14,765		(4,558	)	(8,995	)	32,707
	Other Income (Expense):
	Derivative gains (losses), net	(70	)	—		—		(1,519	)	1,500		183		94
	Foreign currency (gains) losses, net	1,322		474		1		—		53		(130	)	1,720
	Other, net	14,739		—		158		300		(5,013	)	29		10,213
	Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	2,244		(3,335	)	1,564		—		(985	)	—		(512	)
	Segment Profit (Loss)	36,379		(2,490	)	14,703		13,546		(9,003	)
	Other Income (Expense) not included in Segment Profit (Loss)													(3,697	)
	Less Equity Losses included in Segment Profit (Loss)													512
	Income Before Taxes and Equity Earnings													41,037
		Offshore		Inland		Shipping		ICP(1)(2)		Other		Corporate		Total
		Marine		River		Services		$’000		$’000		and		$’000
		Services		Services		$’000						Eliminations
		$’000		$’000								$’000
	For the six months ended
	30-Jun-14
	Operating Revenues:
	External customers	267,171		112,211		105,976		131,454		21,429		—		638,241
	Intersegment	77		1,755		—		—		—		(1,832	)	—
		267,248		113,966		105,976		131,454		21,429		(1,832	)	638,241
	Costs and Expenses:
	Operating	187,798		84,721		55,015		103,703		21,400		(1,755	)	450,882
	Administrative and general	28,586		8,172		11,317		1,105		6,560		17,023		72,763
	Depreciation and amortization	32,752		14,934		14,869		2,000		167		1,890		66,612
		249,136		107,827		81,201		106,808		28,127		17,158		590,257
	Gains (Losses) on Asset Dispositions	11,264		1,663		(41	)	—		(409	)	(3,504	)	8,973
	and Impairments, Net
	Operating Income (Loss)	29,376		7,802		24,734		24,646		(7,107	)	(22,494	)	56,957
	Other Income (Expense):
	Derivative gains (losses), net	(131	)	—		—		(801	)	767		22		(143	)
	Foreign currency gains (losses), net	1,429		147		(9	)	—		62		(108	)	1,521
	Other, net	14,739		(38	)	(3,775	)	493		(4,838	)	(23	)	6,558
	Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	4,885		(3,747	)	2,317		—		(1,746	)	—		1,709
	Segment Profit (Loss)	50,298		4,164		23,267		24,338		(12,862	)
	Other Income (Expense) not included in Segment Profit (Loss)													(5,987	)
	Less Equity Earnings included in Segment Profit (Loss)													(1,709	)
	Income Before Taxes and Equity Earnings													58,906
	Capital Expenditures	46,621		44,086		165,160		2,098		123		15,581		273,669
	As of June 30, 2014
	Property and Equipment:
	Historical cost	1,154,174		519,586		451,123		44,808		3,760		43,176		2,216,627
	Accumulated depreciation	(499,092	)	(161,091	)	(200,908	)	(13,369	)	(769	)	(13,213	)	(888,442	)
		655,082		358,495		250,215		31,439		2,991		29,963		1,328,185
	Construction in progress	91,824		32,175		171,204		2,156		224		(60	)	297,523
	746,906		390,670		421,419		33,595		3,215		29,903		1,625,708
Investments, at Equity, and Advances to 50% or Less Owned Companies	129,775		61,653		205,110		—		87,626		—		484,164
Inventories	5,571		2,309		1,438		9,926		963		—		20,207
Goodwill	13,367		2,793		1,852		—		—		—		18,012
Intangible Assets	2,784		7,085		575		—		310		—		10,754
Other current and long-term assets, excluding cash and near cash assets(3)	154,188		55,819		19,816		13,559		49,232		18,642		311,256
Segment Assets	1,052,591		520,329		650,210		57,080		141,346
Cash and near cash assets(3)													825,892
Total Assets													3,295,993
______________________
-1	Operating revenues includes $126.1 million of tangible product sales and operating expenses includes $98.2 million of costs of goods sold.
-2	Inventories includes raw materials of $2.2 million and work in process of $1.3 million.
-3	Cash and near cash assets includes cash, cash equivalents, restricted cash, marketable securities, construction reserve funds and Title XI reserve funds.
	Offshore		Inland		Shipping		ICP		Other		Corporate		Total
	Marine		River		Services		$’000		$’000		and		$’000
	Services		Services		$’000						Eliminations
	$’000		$’000								$’000
For the three months ended
June 30, 2013
Operating Revenues:
External customers	138,650		46,780		48,103		61,378		20,652		—		315,563
Intersegment	28		577		—		—		—		(605	)	—
	138,678		47,357		48,103		61,378		20,652		(605	)	315,563
Costs and Expenses:
Operating	97,581		35,193		29,554		59,402		18,960		(577	)	240,113
Administrative and general	14,235		3,921		6,124		477		1,323		8,638		34,718
Depreciation and amortization	16,460		7,078		7,907		1,489		96		753		33,783
	128,276		46,192		43,585		61,368		20,379		8,814		308,614
Gains on Asset Dispositions	7,895		4,296		114		—		—		—		12,305
Operating Income (Loss)	18,297		5,461		4,632		10		273		(9,419	)	19,254
Other Income (Expense):
Derivative gains (losses), net	175		—		—		473		(450	)	(1,023	)	(825	)
Foreign currency gains (losses), net	(833	)	219		(8	)	—		(169	)	(125	)	(916	)
Other, net	11		—		188		—		—		(4	)	195
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	7,694		1		(403	)	—		418		—		7,710
Segment Profit	25,344		5,681		4,409		483		72
Other Income (Expense) not included in Segment Profit													1,853
Less Equity Earnings included in Segment Profit													(7,710	)
Income Before Taxes and Equity Earnings													19,561
	Offshore		Inland		Shipping		ICP(1)(2)		Other		Corporate		Total
	Marine		River		Services		$’000		$’000		and		$’000
	Services		Services		$’000						Eliminations
	$’000		$’000								$’000
For the six months ended
30-Jun-13
Operating Revenues:
External customers	262,642		96,203		94,579		94,227		34,976		—		582,627
Intersegment	52		1,231		—		—		—		(1,283	)	—
	262,694		97,434		94,579		94,227		34,976		(1,283	)	582,627
Costs and Expenses:
Operating	187,612		71,582		56,168		93,447		33,448		(1,231	)	441,026
Administrative and general	29,062		7,945		11,301		1,138		2,979		17,938		70,363
Depreciation and amortization	32,747		14,162		15,704		2,978		195		1,545		67,331
	249,421		93,689		83,173		97,563		36,622		18,252		578,720
Gains (Losses) on Asset Dispositions and Impairments, Net	10,234		4,993		(2,955	)	—		1,907		141		14,320
Operating Income (Loss)	23,507		8,738		8,451		(3,336	)	261		(19,394	)	18,227
Other Income (Expense):
Derivative gains (losses), net	325		—		—		512		392		(4,161	)	(2,932	)
Foreign currency gains (losses), net	(4,097	)	82		(15	)	—		(336	)	(561	)	(4,927	)
Other, net	11		—		202		—		54		(69	)	198
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	9,007		(2,386	)	(1,908	)	—		2,128		—		6,841
Segment Profit (Loss)	28,753		6,434		6,730		(2,824	)	2,499
Other Income (Expense) not included in Segment Profit (Loss)													(3,825	)
Less Equity Earnings included in Segment Profit (Loss)													(6,841	)
Loss Before Taxes, Equity Earnings and Discontinued Operations													6,741
Capital Expenditures	49,764		9,238		27,048		217		357		1,307		87,931
As of June 30, 2013
Property and Equipment:
Historical cost	1,151,751		466,553		517,409		44,006		3,989		29,221		2,212,929
Accumulated depreciation	(439,211	)	(134,235	)	(214,372	)	(8,614	)	(531	)	(9,709	)	(806,672	)
	712,540		332,318		303,037		35,392		3,458		19,512		1,406,257
Construction in progress	90,847		17,700		22,037		—		2,087		1,314		133,985
	803,387		350,018		325,074		35,392		5,545		20,826		1,540,242
Investments, at Equity, and Advances to 50% or Less Owned Companies	84,418		55,875		66,786		—		86,714		—		293,793
Inventories	5,885		2,260		1,427		12,164		1,219		—		22,955
Goodwill	13,367		2,759		1,852		—		—		—		17,978
Intangible Assets	4,584		8,416		1,134		50		410		—		14,594
Other current and long-term assets, excluding cash and near cash assets(3)	146,551		37,260		16,021		10,925		56,591		22,225		289,573
Segment Assets	1,058,192		456,588		412,294		58,531		150,479
Cash and near cash assets(3)													589,198
Discontinued operations													—
Total Assets													2,768,333
______________________
-1	Operating revenues includes $90.2 million of tangible product sales and operating expenses includes $89.4 million of costs of goods sold.
-2	Inventories includes raw materials of $2.8 million and work in process of $2.2 million.
-3	Cash and near cash assets includes cash, cash equivalents, restricted cash, marketable securities, construction reserve funds and Title XI reserve funds.

Discontinued_Operations_Notes

Discontinued Operations (Notes)	6 Months Ended
	Jun. 30, 2014
Discontinued Operations [Abstract]	'
Disposal Groups, Including Discontinued Operations, Disclosure	'
	DISCONTINUED OPERATIONS
	Summarized selected operating results of the Company's discontinued operations for the six months ended June 30, 2013 were as follows (in thousands):
	SES Business
	Other Expense (final working capital adjustments)	$	(1,537	)
	Income Tax Benefit	538
	Net Loss	$	(999	)
	SEI
	Other Expense (final working capital adjustments)	$	(143	)
	Income Tax Benefit	50
	Net Loss	$	(93	)
	Era Group
	Operating Revenues	$	22,892
	Costs and Expenses:
	Operating	14,076
	Administrative and general	2,653
	Depreciation and amortization	3,875
		20,604
	Gains on Asset Dispositions and Impairments, Net	548
	Operating Income	2,836
	Other Expense, Net	(1,316		)
	Income Tax Expense	(10,818		)
	Equity in Earnings of 50% or Less Owned Companies	65
	Net Loss	$	(9,233	)
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	'
	Summarized selected operating results of the Company's discontinued operations for the six months ended June 30, 2013 were as follows (in thousands):
	SES Business
	Other Expense (final working capital adjustments)	$	(1,537	)
	Income Tax Benefit	538
	Net Loss	$	(999	)
	SEI
	Other Expense (final working capital adjustments)	$	(143	)
	Income Tax Benefit	50
	Net Loss	$	(93	)
	Era Group
	Operating Revenues	$	22,892
	Costs and Expenses:
	Operating	14,076
	Administrative and general	2,653
	Depreciation and amortization	3,875
		20,604
	Gains on Asset Dispositions and Impairments, Net	548
	Operating Income	2,836
	Other Expense, Net	(1,316		)
	Income Tax Expense	(10,818		)
	Equity in Earnings of 50% or Less Owned Companies	65
	Net Loss	$	(9,233	)

Basis_of_Presentation_and_Acco1

Basis of Presentation and Accounting Policy (Policy)	6 Months Ended
	Jun. 30, 2014
Nature Of Operations And Accounting Policies [Abstract]	'
Basis Of Consolidation	'
	The condensed consolidated financial information for the three and six months ended June 30, 2014 and 2013 has been prepared by the Company and has not been audited by its independent registered public accounting firm. The condensed consolidated financial statements include the accounts of SEACOR Holdings Inc. and its consolidated subsidiaries. In the opinion of management, all adjustments (consisting of normal recurring adjustments) have been made to fairly present the Company’s financial position as of June 30, 2014, its results of operations for the three and six months ended June 30, 2014 and 2013, its comprehensive income (loss) for the three and six months ended June 30, 2014 and 2013, its changes in equity for the six months ended June 30, 2014, and its cash flows for the six months ended June 30, 2014 and 2013. Results of operations for the interim periods presented are not necessarily indicative of operating results for the full year or any future periods.
	Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States have been condensed or omitted. These condensed consolidated financial statements should be read in conjunction with the financial statements and related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.
	Unless the context otherwise indicates, any reference in this Quarterly Report on Form 10-Q to the “Company” refers to SEACOR Holdings Inc. and its consolidated subsidiaries and any reference in this Quarterly Report on Form 10-Q to “SEACOR” refers to SEACOR Holdings Inc. Capitalized terms used and not specifically defined herein have the same meaning as such defined terms used in the Company's Annual report on Form 10-K for the year ended December 31, 2013.
Discontinued Operations, Policy	'
	Discontinued Operations (see Note 15). The Company reports disposed businesses as discontinued operations when it has no continuing interest in the business. Discontinued operations includes the historical financial position, results of operations and cash flows of the operations previously reported as discontinued in the Company's Annual Report on Form 10-K for the year ended December 31, 2013.
Revenue Recognition	'
	Revenue Recognition. The Company recognizes revenue when it is realized or realizable and earned. Revenue is realized or realizable and earned when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price to the buyer is fixed or determinable, and collectability is reasonably assured. Revenue that does not meet these criteria is deferred until the criteria are met. Deferred revenues, included in other current liabilities, for the six months ended June 30, were as follows (in thousands):
		2014				2013
	Balance at beginning of period	$	6,592			$	6,592
	Revenues deferred during the period	202				—
	Balance at end of period	$	6,794			$	6,592
	As of June 30, 2014 and 2013, the Company's deferred revenues related to the time charter of several offshore support vessels scheduled to be paid through the conveyance of an overriding royalty interest (the "Conveyance") in developmental oil and gas producing properties operated by a customer in the U.S. Gulf of Mexico. Payments under the Conveyance, and the timing of such payments, were contingent upon production and energy sale prices. On August 17, 2012, the customer filed a voluntary petition for chapter 11 bankruptcy, which was converted to chapter 7 in June 2014. The Company is vigorously defending its interest in connection with the bankruptcy filing; however, payments received under the Conveyance subsequent to August 17, 2012 and during the 90 days prior to the filing are subject to bankruptcy court approval. The Company will recognize revenues as approved by the bankruptcy court. All costs and expenses related to these charters were recognized as incurred.
Comprehensive Income (Loss) Note	'
	Accumulated Other Comprehensive Income (Loss). The components of accumulated other comprehensive income (loss) were as follows:
			SEACOR Holdings Inc. Stockholders' Equity													Noncontrolling
																Interests
			Foreign				Derivative			Other			Total			Foreign		Other			Other
			Currency				Losses on									Currency					Comprehensive
			Translation				Cash Flow									Translation					Income
			Adjustments				Hedges, net									Adjustments
	31-Dec-13		$	(927	)		$	(257	)	$	(8	)	$	(1,192	)	$	395	$	(5	)
	Other comprehensive income		1,988				192			—			2,180			239		—			$	2,419
	Income tax expense		(696		)		(67		)	—			(763		)	—		—			(763		)
	Six months ended June 30, 2014		$	365			$	(132	)	$	(8	)	$	225		$	634	$	(5	)	$	1,656
New Accounting Pronouncements	'
	New Accounting Pronouncement. On May 28, 2014, the Financial Accounting Standards Board issued a comprehensive new revenue recognition standard that will supersede nearly all existing revenue recognition guidance under generally accepted accounting principles in the United States. The core principal of the new standard is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The new standard is effective for annual and interim periods beginning after December 15, 2016 and early adoption is prohibited. The Company has not yet determined what impact, if any, the adoption of the new standard will have on its consolidated financial position, results of operations or cash flows.
Reclassifications	'
	Reclassifications. Certain reclassifications of prior period information have been made to conform to the presentation of the current period information. These reclassifications had no effect on net income as previously reported.

Basis_of_Presentation_and_Acco2

Basis of Presentation and Accounting Policy Deferred Revenue (Tables)	6 Months Ended
	Jun. 30, 2014
Deferred Revenue [Abstract]	'
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]	'
	Deferred revenues, included in other current liabilities, for the six months ended June 30, were as follows (in thousands):
		2014		2013
	Balance at beginning of period	$	6,592	$	6,592
	Revenues deferred during the period	202		—
	Balance at end of period	$	6,794	$	6,592

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	'
	The Company’s financial assets and liabilities as of June 30, 2014 that are measured at fair value on a recurring basis were as follows (in thousands):
		Level 1			Level 2			Level 3
	ASSETS
	Marketable securities(1)	$	33,275		$	—		$	—
	Derivative instruments (included in other receivables)	2,012			4,442			—
	Construction reserve funds and Title XI reserve funds	324,856			—			—
	LIABILITIES
	Short sale of marketable securities (included in other current liabilities)	10,061			—			—
	Derivative instruments (included in other current liabilities)	2,043			1,016			—
	______________________
	-1	Marketable security gains, net include unrealized gains of $0.7 million and $6.5 million for the three months ended June 30, 2014 and 2013, respectively, related to marketable security positions held by the Company as of June 30, 2014. Marketable security gains, net include unrealized gains of $5.7 million and $10.5 million for the six months ended June 30, 2014 and 2013, respectively, related to marketable security positions held by the Company as of June 30, 2014.
Estimated Fair Value Of Other Financial Assets And Liabilities	'
	The estimated fair values of the Company’s other financial assets and liabilities as of June 30, 2014 were as follows (in thousands):
					Estimated Fair Value
		Carrying			Level 1			Level 2			Level 3
		Amount
	ASSETS
	Cash, cash equivalents and restricted cash	$	467,761		$	467,761		$	—		$	—
	Investments, at cost, in 50% or less owned companies (included in other	9,331			see below
	assets)
	Notes receivable from third parties (included in other receivables and other assets)	20,228			see below
	LIABILITIES
	Long-term debt, including current portion(1)	873,860			—			1,055,228			—
	______________________
	-1	The estimated fair value includes the conversion options on the Company's 2.5% and 3.0% Convertible Senior Notes.
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis	'
	The Company’s non-financial assets and liabilities that were measured at fair value during the six months ended June 30, 2014 were as follows (in thousands):
			Level 1			Level 2			Level 3
	ASSETS
	Long-lived assets held for sale(1)		$	—		$	11,700		$	—
	______________________
	-1	During the six months ended June 30, 2014, the Company recognized impairment charges of $3.9 million related to two aircraft following the adjustment of their carrying value to fair value based on the expected sales price of each.

Derivative_Instruments_And_Hed1

Derivative Instruments And Hedging Strategies (Tables)	6 Months Ended
	Jun. 30, 2014
Derivative [Line Items]	'
Fair Values Of Derivative Instruments	'
	The fair values of the Company’s derivative instruments as of June 30, 2014 were as follows (in thousands):
		Derivative			Derivative
		Asset			Liability
	Forward currency exchange, option and future contracts	$	92		$	60
	Interest rate swap agreements	—			998
	Commodity swap, option and future contracts:
	Exchange traded	2,012			1,983
	Non-exchange traded	4,350			18
		$	6,454		$	3,059
Not Designated as Hedging Instrument [Member]	'
Derivative [Line Items]	'
Recognized Gains (Losses) On Derivative Instruments Not Designated As Hedging Instruments	'
	Other Derivative Instruments. The Company recognized gains (losses) on derivative instruments not designated as hedging instruments for the six months ended June 30 as follows (in thousands):
		2014			2013
	Options on equities and equity indices	$	22		$	(3,012	)
	Forward currency exchange, option and future contracts	187			(592		)
	Interest rate swap agreements	(135		)	237
	Commodity swap, option and future contracts:
	Exchange traded	950			(821		)
	Non-exchange traded	(1,167		)	1,256
		$	(143	)	$	(2,932	)

Equipment_Acquisitions_Disposi1

Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies (Tables)	6 Months Ended
	Jun. 30, 2014
Equipment Acquisitions, Dispositions And Depreciation And Impairment Policies [Abstract]	'
Schedule Of Deferred Gain Activity	'
	Deferred gain activity related to these transactions for the six months ended June 30 was as follows (in thousands):
		2014			2013
	Balance at beginning of period	$	124,763		$	111,514
	Adjustments to deferred gains arising from asset sales	40,445			2,289
	Amortization of deferred gains included in operating expenses as a reduction to rental expense	(7,155		)	(5,192		)
	Amortization of deferred gains included in gains on asset dispositions and impairments, net	(2,656		)	(1,431		)
	Balance at end of period	$	155,397		$	107,180
Schedule of Estimated Useful Life of Newly Acquired Equipment	'
	As of June 30, 2014, the estimated useful life (in years) of each of the Company’s major categories of new equipment was as follows:
	Offshore support vessels (excluding wind farm utility)	20
	Wind farm utility vessels	10
	Inland river dry-cargo and deck barges	20
	Inland river liquid tank barges	25
	Inland river towboats	25
	U.S.-flag product tankers	25
	Short-sea Container/RORO(1) vessels	20
	Harbor tugs	25
	Ocean liquid tank barges	25
	Terminal and manufacturing facilities	20
	______________________
	-1	Roll on/Roll off ("RORO").

Noncontrolling_Interests_in_Su1

Noncontrolling Interests in Subsidiaries (Tables)	6 Months Ended
	Jun. 30, 2014
Noncontrolling Interest [Abstract]	'
Noncontrolling Interests in Subsidiaries [Table Text Block]	'
	oncontrolling interests in the Company's consolidated subsidiaries were as follows (amounts in thousands except noncontrolling interests' percentages):
		Noncontrolling Interests				30-Jun-14		December 31, 2013
	Offshore Marine Services:
	Windcat Workboats Ltd.	25%				$	7,761	$	7,541
	Other	1.8	%	–	33.30%	1,233		1,600
	Inland River Services:
	Other	3	%	–	51.80%	1,204		2,612
	Shipping Services:
	Sea-Vista	49%				72,886		—
	Illinois Corn Processing	30%				16,864		10,894
	Other	5	%	–	18.90%	1,751		1,929
						$	101,699	$	24,576

Earnings_Per_Common_Share_of_S1

Earnings Per Common Share of SEACOR (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Common Share of SEACOR [Abstract]	'
Schedule of Weighted Average Number of Shares	'
	Computations of basic and diluted earnings per common share of SEACOR were as follows (in thousands, except share data):
		Three Months Ended June 30,					Six Months Ended June 30,
		Net Income Attributable to SEACOR		Average O/S Shares	Per Share		Net Income (Loss) Attributable to SEACOR			Average O/S Shares	Per Share
	2014
	Basic Weighted Average Common Shares Outstanding	$	21,067	19,989,402	$	1.05	$	32,576		20,049,056	$	1.62
	Effect of Dilutive Share Awards:
	Options and Restricted Stock(1)	—		394,567			—			416,288
	Convertible Notes(2)	3,148		4,200,525			6,287			4,200,525
	Diluted Weighted Average Common Shares Outstanding	$	24,215	24,584,494	$	0.98	$	38,863		24,665,869	$	1.58
	2013
	Basic Weighted Average Common Shares Outstanding	$	19,271	19,825,229	$	0.97	$	(1,717	)	19,782,318	$	(0.09	)
	Effect of Dilutive Share Awards:
	Options and Restricted Stock(1)	—		366,558			—			332,586
	Convertible Notes(3)	3,044		4,200,525			—			—
	Diluted Weighted Average Common Shares Outstanding	$	22,315	24,392,312	$	0.91	$	(1,717	)	20,114,904	$	(0.09	)
	______________________
	-1	For the three months ended June 30, 2014 and 2013, diluted earnings per common share of SEACOR excluded 365,398 and 355,490 of certain share awards, respectively, as the effect of their inclusion in the computation would be anti-dilutive. For the six months ended June 30, 2014 and 2013, diluted earnings per common share of SEACOR excluded 288,510 and 503,726 of certain share awards, respectively, as the effect of their inclusion in the computation would be anti-dilutive.
	-2	For the three and six months ended June 30, 2014, diluted earnings per common share of SEACOR excluded 1,825,326 common shares issuable pursuant to the Company's 3.0% Convertible Senior Notes as the effect of their inclusion in the computation would be anti-dilutive.
	-3	For the six months ended June 30, 2013, diluted earnings per common share of SEACOR excluded 4,200,525 common shares issuable pursuant to the Company's 2.5% Convertible Senior Notes as the effect of their inclusion in the computation would be anti-dilutive.

Share_Based_Compensation_Table

Share Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Share Based Compensation Plans	'
	Transactions in connection with the Company’s share based compensation plans during the six months ended June 30, 2014 were as follows:
	Director stock awards granted	1,250
	Employee Stock Purchase Plan (“ESPP”) shares issued	16,720
	Restricted stock awards granted	147,645
	Restricted stock awards canceled	1,000
	Shares released from Deferred Compensation Plan	—
	Stock Option Activities:
	Outstanding as of December 31, 2013	1,481,280
	Granted	106,925
	Exercised	(90,144	)
	Outstanding as of June 30, 2014	1,498,061
	Shares available for future grants and ESPP purchases as of June 30, 2014	1,236,955

Segment_Information_Segment_In

Segment Information Segment Information (Tables)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Operating Results, Capital Expenditures And Assets By Reporting Segment	'
	The following tables summarize the operating results, capital expenditures and assets of the Company's reportable segments.
		Offshore		Inland		Shipping		ICP		Other		Corporate		Total
		Marine		River		Services		$’000		$’000		and		$’000
		Services		Services		$’000						Eliminations
		$’000		$’000								$’000
	For the three months ended
	30-Jun-14
	Operating Revenues:
	External customers	138,214		55,200		53,575		72,798		8,437		—		328,224
	Intersegment	33		807		—		—		—		(840	)	—
		138,247		56,007		53,575		72,798		8,437		(840	)	328,224
	Costs and Expenses:
	Operating	93,755		45,047		28,018		56,429		9,464		(807	)	231,906
	Administrative and general	13,426		3,835		5,421		594		3,449		7,961		34,686
	Depreciation and amortization	16,448		7,564		7,115		1,010		82		1,001		33,220
		123,629		56,446		40,554		58,033		12,995		8,155		299,812
	Gains (Losses) on Asset Dispositions	3,526		810		(41	)	—		—		—		4,295
	Operating Income (Loss)	18,144		371		12,980		14,765		(4,558	)	(8,995	)	32,707
	Other Income (Expense):
	Derivative gains (losses), net	(70	)	—		—		(1,519	)	1,500		183		94
	Foreign currency (gains) losses, net	1,322		474		1		—		53		(130	)	1,720
	Other, net	14,739		—		158		300		(5,013	)	29		10,213
	Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	2,244		(3,335	)	1,564		—		(985	)	—		(512	)
	Segment Profit (Loss)	36,379		(2,490	)	14,703		13,546		(9,003	)
	Other Income (Expense) not included in Segment Profit (Loss)													(3,697	)
	Less Equity Losses included in Segment Profit (Loss)													512
	Income Before Taxes and Equity Earnings													41,037
		Offshore		Inland		Shipping		ICP(1)(2)		Other		Corporate		Total
		Marine		River		Services		$’000		$’000		and		$’000
		Services		Services		$’000						Eliminations
		$’000		$’000								$’000
	For the six months ended
	30-Jun-14
	Operating Revenues:
	External customers	267,171		112,211		105,976		131,454		21,429		—		638,241
	Intersegment	77		1,755		—		—		—		(1,832	)	—
		267,248		113,966		105,976		131,454		21,429		(1,832	)	638,241
	Costs and Expenses:
	Operating	187,798		84,721		55,015		103,703		21,400		(1,755	)	450,882
	Administrative and general	28,586		8,172		11,317		1,105		6,560		17,023		72,763
	Depreciation and amortization	32,752		14,934		14,869		2,000		167		1,890		66,612
		249,136		107,827		81,201		106,808		28,127		17,158		590,257
	Gains (Losses) on Asset Dispositions	11,264		1,663		(41	)	—		(409	)	(3,504	)	8,973
	and Impairments, Net
	Operating Income (Loss)	29,376		7,802		24,734		24,646		(7,107	)	(22,494	)	56,957
	Other Income (Expense):
	Derivative gains (losses), net	(131	)	—		—		(801	)	767		22		(143	)
	Foreign currency gains (losses), net	1,429		147		(9	)	—		62		(108	)	1,521
	Other, net	14,739		(38	)	(3,775	)	493		(4,838	)	(23	)	6,558
	Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	4,885		(3,747	)	2,317		—		(1,746	)	—		1,709
	Segment Profit (Loss)	50,298		4,164		23,267		24,338		(12,862	)
	Other Income (Expense) not included in Segment Profit (Loss)													(5,987	)
	Less Equity Earnings included in Segment Profit (Loss)													(1,709	)
	Income Before Taxes and Equity Earnings													58,906
	Capital Expenditures	46,621		44,086		165,160		2,098		123		15,581		273,669
	As of June 30, 2014
	Property and Equipment:
	Historical cost	1,154,174		519,586		451,123		44,808		3,760		43,176		2,216,627
	Accumulated depreciation	(499,092	)	(161,091	)	(200,908	)	(13,369	)	(769	)	(13,213	)	(888,442	)
		655,082		358,495		250,215		31,439		2,991		29,963		1,328,185
	Construction in progress	91,824		32,175		171,204		2,156		224		(60	)	297,523
		746,906		390,670		421,419		33,595		3,215		29,903		1,625,708
	Investments, at Equity, and Advances to 50% or Less Owned Companies	129,775		61,653		205,110		—		87,626		—		484,164
Inventories	5,571		2,309		1,438		9,926		963		—		20,207
Goodwill	13,367		2,793		1,852		—		—		—		18,012
Intangible Assets	2,784		7,085		575		—		310		—		10,754
Other current and long-term assets, excluding cash and near cash assets(3)	154,188		55,819		19,816		13,559		49,232		18,642		311,256
Segment Assets	1,052,591		520,329		650,210		57,080		141,346
Cash and near cash assets(3)													825,892
Total Assets													3,295,993
______________________
-1	Operating revenues includes $126.1 million of tangible product sales and operating expenses includes $98.2 million of costs of goods sold.
-2	Inventories includes raw materials of $2.2 million and work in process of $1.3 million.
-3	Cash and near cash assets includes cash, cash equivalents, restricted cash, marketable securities, construction reserve funds and Title XI reserve funds.
	Offshore		Inland		Shipping		ICP		Other		Corporate		Total
	Marine		River		Services		$’000		$’000		and		$’000
	Services		Services		$’000						Eliminations
	$’000		$’000								$’000
For the three months ended
June 30, 2013
Operating Revenues:
External customers	138,650		46,780		48,103		61,378		20,652		—		315,563
Intersegment	28		577		—		—		—		(605	)	—
	138,678		47,357		48,103		61,378		20,652		(605	)	315,563
Costs and Expenses:
Operating	97,581		35,193		29,554		59,402		18,960		(577	)	240,113
Administrative and general	14,235		3,921		6,124		477		1,323		8,638		34,718
Depreciation and amortization	16,460		7,078		7,907		1,489		96		753		33,783
	128,276		46,192		43,585		61,368		20,379		8,814		308,614
Gains on Asset Dispositions	7,895		4,296		114		—		—		—		12,305
Operating Income (Loss)	18,297		5,461		4,632		10		273		(9,419	)	19,254
Other Income (Expense):
Derivative gains (losses), net	175		—		—		473		(450	)	(1,023	)	(825	)
Foreign currency gains (losses), net	(833	)	219		(8	)	—		(169	)	(125	)	(916	)
Other, net	11		—		188		—		—		(4	)	195
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	7,694		1		(403	)	—		418		—		7,710
Segment Profit	25,344		5,681		4,409		483		72
Other Income (Expense) not included in Segment Profit													1,853
Less Equity Earnings included in Segment Profit													(7,710	)
Income Before Taxes and Equity Earnings													19,561
	Offshore		Inland		Shipping		ICP(1)(2)		Other		Corporate		Total
	Marine		River		Services		$’000		$’000		and		$’000
	Services		Services		$’000						Eliminations
	$’000		$’000								$’000
For the six months ended
30-Jun-13
Operating Revenues:
External customers	262,642		96,203		94,579		94,227		34,976		—		582,627
Intersegment	52		1,231		—		—		—		(1,283	)	—
	262,694		97,434		94,579		94,227		34,976		(1,283	)	582,627
Costs and Expenses:
Operating	187,612		71,582		56,168		93,447		33,448		(1,231	)	441,026
Administrative and general	29,062		7,945		11,301		1,138		2,979		17,938		70,363
Depreciation and amortization	32,747		14,162		15,704		2,978		195		1,545		67,331
	249,421		93,689		83,173		97,563		36,622		18,252		578,720
Gains (Losses) on Asset Dispositions and Impairments, Net	10,234		4,993		(2,955	)	—		1,907		141		14,320
Operating Income (Loss)	23,507		8,738		8,451		(3,336	)	261		(19,394	)	18,227
Other Income (Expense):
Derivative gains (losses), net	325		—		—		512		392		(4,161	)	(2,932	)
Foreign currency gains (losses), net	(4,097	)	82		(15	)	—		(336	)	(561	)	(4,927	)
Other, net	11		—		202		—		54		(69	)	198
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	9,007		(2,386	)	(1,908	)	—		2,128		—		6,841
Segment Profit (Loss)	28,753		6,434		6,730		(2,824	)	2,499
Other Income (Expense) not included in Segment Profit (Loss)													(3,825	)
Less Equity Earnings included in Segment Profit (Loss)													(6,841	)
Loss Before Taxes, Equity Earnings and Discontinued Operations													6,741
Capital Expenditures	49,764		9,238		27,048		217		357		1,307		87,931
As of June 30, 2013
Property and Equipment:
Historical cost	1,151,751		466,553		517,409		44,006		3,989		29,221		2,212,929
Accumulated depreciation	(439,211	)	(134,235	)	(214,372	)	(8,614	)	(531	)	(9,709	)	(806,672	)
	712,540		332,318		303,037		35,392		3,458		19,512		1,406,257
Construction in progress	90,847		17,700		22,037		—		2,087		1,314		133,985
	803,387		350,018		325,074		35,392		5,545		20,826		1,540,242
Investments, at Equity, and Advances to 50% or Less Owned Companies	84,418		55,875		66,786		—		86,714		—		293,793
Inventories	5,885		2,260		1,427		12,164		1,219		—		22,955
Goodwill	13,367		2,759		1,852		—		—		—		17,978
Intangible Assets	4,584		8,416		1,134		50		410		—		14,594
Other current and long-term assets, excluding cash and near cash assets(3)	146,551		37,260		16,021		10,925		56,591		22,225		289,573
Segment Assets	1,058,192		456,588		412,294		58,531		150,479
Cash and near cash assets(3)													589,198
Discontinued operations													—
Total Assets													2,768,333
______________________
-1	Operating revenues includes $90.2 million of tangible product sales and operating expenses includes $89.4 million of costs of goods sold.
-2	Inventories includes raw materials of $2.8 million and work in process of $2.2 million.
-3	Cash and near cash assets includes cash, cash equivalents, restricted cash, marketable securities, construction reserve funds and Title XI reserve funds.

Basis_of_Presentation_and_Acco3

Basis of Presentation and Accounting Policy Accumulated Other Comprehensive Income (Details) (USD $)

3 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

In Thousands, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2012

Accumulated Translation Adjustment [Member]

Accumulated Translation Adjustment [Member]

Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]

Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]

Other Postretirement Benefit Plans, Defined Benefit [Member]

Other Postretirement Benefit Plans, Defined Benefit [Member]

Non-Controlling Interests In Subsidiaries [Member]

Non-Controlling Interests In Subsidiaries [Member]

Non-Controlling Interests In Subsidiaries [Member]

Non-Controlling Interests In Subsidiaries [Member]

Non-Controlling Interests In Subsidiaries [Member]

Offshore Marine Services [Member]

Offshore Marine Services [Member]

Offshore Marine Services [Member]

Offshore Marine Services [Member]

Accumulated Translation Adjustment [Member]

Accumulated Translation Adjustment [Member]

Other Postretirement Benefit Plans, Defined Benefit [Member]

Other Postretirement Benefit Plans, Defined Benefit [Member]

Deferred Revenue

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$6,794

$6,592

$6,592

$6,592

Accumulated Other Comprehensive Income (Loss), Net of Tax

225

'

225

'

-1,192

365

-927

-132

-257

-8

-8

'

634

395

-5

-5

'

'

'

'

Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent

'

'

2,180

'

'

1,988

'

192

'

0

'

'

'

'

'

'

'

'

'

'

Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest

'

'

'

'

'

'

'

'

'

'

'

'

239

'

0

'

'

'

'

'

Other Comprehensive Income (Loss), before Tax

1,967

142

2,419

-3,840

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent

'

'

-763

'

'

-696

'

-67

'

0

'

'

'

'

'

'

'

'

'

'

Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest

'

'

'

'

'

'

'

'

'

'

'

'

0

'

0

'

'

'

'

'

Other Comprehensive Income (Loss), Tax

621

41

763

-1,186

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other Comprehensive Income (Loss), Net of Tax

$1,346

$101

$1,656

($2,654)

'

'

'

'

'

'

'

($239)

'

'

'

'

'

'

'

'

Basis_of_Presentation_and_Acco4

Basis of Presentation and Accounting Policy Deferred Revenue (Details) (Offshore Marine Services [Member], USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Offshore Marine Services [Member]	'	'	'	'
Deferred Revenue	$6,794	$6,592	$6,592	$6,592
Deferred Revenue, Additions	$202	$0	'	'

Fair_Value_Measurements_Financ

Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Marketable security gains (losses), net include losses	$700,000	$6,500,000	$5,700,000	$10,500,000
Fair Value, Inputs, Level 1 [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Marketable securities	33,275,000	'	33,275,000	'
Derivative instruments (included in other receivables)	2,012,000	'	2,012,000	'
Construction reserve funds and Title XI reserve funds	324,856,000	'	324,856,000	'
Short sales of marketable securities	10,061,000	'	10,061,000	'
Derivative instruments (included in other current liabilities)	2,043,000	'	2,043,000	'
Fair Value, Inputs, Level 2 [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Marketable securities	0	'	0	'
Derivative instruments (included in other receivables)	4,442,000	'	4,442,000	'
Construction reserve funds and Title XI reserve funds	0	'	0	'
Short sales of marketable securities	0	'	0	'
Derivative instruments (included in other current liabilities)	1,016,000	'	1,016,000	'
Fair Value, Inputs, Level 3 [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Marketable securities	0	'	0	'
Derivative instruments (included in other receivables)	0	'	0	'
Construction reserve funds and Title XI reserve funds	0	'	0	'
Short sales of marketable securities	0	'	0	'
Derivative instruments (included in other current liabilities)	$0	'	$0	'

Fair_Value_Measurements_Estima

Fair Value Measurements (Estimated Fair Value Of Other Financial Assets And Liabilities) (Details) (USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Cash, cash equivalents and restricted cash, Carrying Amount	$467,761
Investments, at cost, in 50% or less owned companies (included in other assets), Carrying Amount	9,331
Notes receivable from other business ventures (included in other receivables and other assets)	20,228
Long-term debt, including current portion, Carrying Amount	873,860
Fair Value, Inputs, Level 1 [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Cash and Cash Equivalents, Fair Value Disclosure	467,761
Debt Instrument, Fair Value Disclosure	0
Fair Value, Inputs, Level 2 [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Cash and Cash Equivalents, Fair Value Disclosure	0
Debt Instrument, Fair Value Disclosure	1,055,228
Fair Value, Inputs, Level 3 [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Cash and Cash Equivalents, Fair Value Disclosure	0
Debt Instrument, Fair Value Disclosure	$0
Two Point Five Percentage Convertible Notes [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Debt Instrument, Interest Rate, Stated Percentage	2.50%
Three Point Zero Percentage Convertible Notes [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Debt Instrument, Interest Rate, Stated Percentage	3.00%

Fair_Value_Measurements_NonFin

Fair Value Measurements (Non-Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014
Fair Value, Inputs, Level 1 [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Assets Held-for-sale, Long Lived	$0
Fair Value, Inputs, Level 2 [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Assets Held-for-sale, Long Lived	11,700,000
Fair Value, Inputs, Level 3 [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Assets Held-for-sale, Long Lived	0
Aircraft [Domain]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Asset Impairment Charges	$3,900,000

Derivative_Instruments_And_Hed2

Derivative Instruments And Hedging Strategies (Fair Values Of Derivative Instruments) (Details) (Not Designated as Hedging Instrument [Member], USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Derivative [Line Items]	'
Derivative Asset, Fair Value, Gross Asset	$6,454
Derivative Liability	3,059
Foreign Exchange [Member]	'
Derivative [Line Items]	'
Derivative Asset, Fair Value, Gross Asset	92
Derivative Liability	60
Interest Rate Swap Agreements [Member]	'
Derivative [Line Items]	'
Derivative Asset, Fair Value, Gross Asset	0
Derivative Liability	998
Commodity Contract [Member]	'
Derivative [Line Items]	'
Derivative Asset, Fair Value, Gross Asset	2,012
Derivative Liability	1,983
Commodity Swap, Option And Future Contracts, Non-Exchange Traded [Member]	'
Derivative [Line Items]	'
Derivative Asset, Fair Value, Gross Asset	4,350
Derivative Liability	$18

Derivative_Instruments_And_Hed3

Derivative Instruments And Hedging Strategies (Narrative) (Details) (Cash Flow Hedging [Member], USD $)	Jun. 30, 2014
In Millions, unless otherwise specified
Sea Cat Crewzer [Member]	'
Derivative [Line Items]	'
Fixed interest rate	1.48%
Derivative, Notional Amount	$16.10
SCFCo Holdings [Member]	'
Derivative [Line Items]	'
Fixed interest rate range, minimum	1.53%
Fixed interest rate range, maximum	1.62%
Derivative, Notional Amount	18.8
Seajon [Member]	'
Derivative [Line Items]	'
Fixed interest rate	2.79%
Derivative, Notional Amount	$36.20

Derivative_Instruments_And_Hed4

Derivative Instruments And Hedging Strategies (Recognized Gains (Losses) On Derivative Instruments Not Designated As Hedging Instruments) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Derivative [Line Items]	'	'
Derivative gains (losses), net	($143,000)	($2,932,000)
Options On Equities And Equity Indices [Member]	'	'
Derivative [Line Items]	'	'
Derivative gains (losses), net	22,000	-3,012,000
Forward Currency Exchange, Option And Future Contracts [Member]	'	'
Derivative [Line Items]	'	'
Derivative gains (losses), net	187,000	-592,000
Interest Rate Swap Agreements [Member]	'	'
Derivative [Line Items]	'	'
Derivative gains (losses), net	-135,000	237,000
Commodity Contract [Member]	'	'
Derivative [Line Items]	'	'
Derivative gains (losses), net	950,000	-821,000
Commodity Swap, Option And Future Contracts, Non-Exchange Traded [Member]	'	'
Derivative [Line Items]	'	'
Derivative gains (losses), net	-1,167,000	1,256,000
Not Designated as Hedging Instrument [Member] | Forward Currency Exchange, Option And Future Contracts [Member]	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	4,700,000	'
Not Designated as Hedging Instrument [Member] | Interest Rate Swap Agreements [Member]	'	'
Derivative [Line Items]	'	'
Derivative, Lower Fixed Interest Rate Range	3.00%	'
Derivative, Higher Fixed Interest Rate Range	3.05%	'
Derivative, Notional Amount	34,500,000	'
Not Designated as Hedging Instrument [Member] | Dynamic Offshore Drilling Ltd [Member] | Interest Rate Swap Agreements [Member]	'	'
Derivative [Line Items]	'	'
Derivative, Fixed Interest Rate	1.30%	'
Derivative, Notional Amount	98,300,000	'
Not Designated as Hedging Instrument [Member] | OSV Partners [Member] | Interest Rate Swap Agreements [Member]	'	'
Derivative [Line Items]	'	'
Derivative, Lower Fixed Interest Rate Range	1.89%	'
Derivative, Higher Fixed Interest Rate Range	2.27%	'
Derivative, Notional Amount	24,900,000	'
Not Designated as Hedging Instrument [Member] | Dorian LPG [Member] | Interest Rate Swap Agreements [Member]	'	'
Derivative [Line Items]	'	'
Derivative, Lower Fixed Interest Rate Range	2.96%	'
Derivative, Higher Fixed Interest Rate Range	5.40%	'
Derivative, Notional Amount	$126,000,000	'

Business_Acquisitions_Narrativ

Business Acquisitions (Narrative) (Details) (USD $)	12 Months Ended			3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Jun. 06, 2013	Jun. 06, 2013	Sep. 30, 2014	Jul. 11, 2014
	C Lift L L C [Member]	C Lift L L C [Member]	C Lift L L C [Member]	Subsequent Event [Member]	Subsequent Event [Member]
			Liftboats [Member]	Witt O'Brien's LLC [Member]	Witt O'Brien's LLC [Member]
Business Acquisition [Line Items]	'	'	'	'	'
Business Acquisition, Percentage of Voting Interests Acquired	'	50.00%	'	'	45.80%
Payments to Acquire Businesses, Gross	$13.30	'	'	$35.40	'
Number Of Equipments Acquired	'	'	2	'	'

Equipment_Acquisitions_Disposi2

Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies (Deferred Gain Activity) (Details) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Equipment Acquisitions, Dispositions And Depreciation And Impairment Policies [Abstract]	'	'
Document Period End Date	30-Jun-14	'
Movement in Deferred Gain Activity [Roll Forward]	'	'
Deferred Gains at Beginning of Period	$124,763	$111,514
Deferred Gains on Asset Sales	40,400	2,289
Amortization Of Deferred Gains Included in Operating Expenses As A Reduction To Rental Expense	-7,155	-5,192
Amortization Of Deferred Gains Included In Gains On Asset Dispositions And Impairments, Net	-2,656	-1,431
Deferred Gains at End of Period	$155,397	$107,180

Equipment_Acquisitions_Disposi3

Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies (Useful Life) (Details)	6 Months Ended
	Jun. 30, 2014
Offshore Support Vessels [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'20 years
Wind Farm Utility Vessel [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'10 years
Inland River Dry Cargo And Deck Barges [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'20 years
Inland River Liquid Tank Barges [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'25 years
Inland River Towboats [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'25 years
U.S.-flag Product Tankers [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'25 years
R O R O Vessels [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'20 years	[1]
Harbor Tugs [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'25 years
Ocean Liquid Tank Barge [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'25 years
Terminal And Manufacturing Facilities [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life (in years)	'20 years
[1]	Roll on/Roll off ("RORO").

Equipment_Acquisitions_Disposi4

Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies (Narrative) (Details) (USD $)

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

U.S.-flag Product Tankers [Member]

U.S.-flag Product Tankers [Member]

Offshore Support Vessels Crew [Member]

Offshore Support Vessels Crew [Member]

Offshore Support Vessels Supply [Member]

Offshore Support Vessels Supply [Member]

Wind Farm Utility Vessel [Member]

Wind Farm Utility Vessel [Member]

Inland River Dry Cargo And Deck Barges [Member]

Inland River Towboat [Member]

R O R O Vessels [Member]

Aircraft [Domain]

Gains on Asset Dispositions and Impariments, Net [Member]

Deposits [Member]

equipment

equipment

equipment

equipment

equipment

equipment

equipment

equipment

equipment

equipment

equipment

Property, Plant and Equipment [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Document Period End Date

30-Jun-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Property, Plant, and Equipment

$273,669,000

$87,931,000

$148,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecorded Unconditional Purchase Obligation, Maximum Quantity

'

'

3

'

'

'

'

'

'

'

'

'

'

'

'

'

Number Of Equipments Delivered

'

'

'

'

2

'

1

'

1

'

65

1

'

'

'

'

Number Of Equipments Sold

'

'

'

1

'

5

'

3

'

1

'

'

1

'

'

'

Sales Price Of Equipment

100,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Sale of Property, Plant and Equipment, Excluding Deposits on Future Equipment Sales

75,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Issuance of Secured Debt

25,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from disposition of property and equipment

78,039,000

125,432,000

'

'

'

'

'

'

'

'

'

'

'

'

'

2,700,000

Gain (Loss) on Disposition of Property Plant Equipment

50,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10,200,000

'

Deferred Gains on Asset Sales

40,400,000

2,289,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amortization Of Deferred Gains Included In Gains On Asset Dispositions And Impairments, Net

-2,656,000

-1,431,000

'

'

'

'

'

'

'

'

'

'

'

'

2,700,000

'

Asset Impairment Charges

'

'

'

'

'

'

'

'

'

'

'

'

'

$3,900,000

'

'

Investments_At_Equity_And_Adva1

Investments, At Equity, And Advances To 50% Or Less Owned Companies (Narrative) (Details) (USD $)

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jul. 15, 2014

Sep. 30, 2014

Jul. 11, 2014

In Millions, unless otherwise specified

Mexmar [Member]

OSV Partners [Member]

SCFCo Holdings [Member]

Seajon [Member]

Avion Pacific Limited [Member]

Witt O'Brien's LLC [Member]

Cleancor [Member]

Other Inland River Joint Ventures [Member]

Other Offshore Marine Services Joint Ventures [Member]

Other Corporate Joint Ventures [Member]

Subsequent Event [Member]

Witt O'Brien's LLC [Member]

Witt O'Brien's LLC [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Schedule Of Equity Method Investments [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number Of Equipments Delivered

'

0

1

'

'

'

'

'

'

'

'

'

'

'

Proceeds From Property And Equipment Sales To Fifty Percent Or Less Owned Companies

'

$32

$13.50

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Machinery and Equipment

'

6.4

'

'

'

'

'

'

'

'

'

'

'

'

Secured Debt

'

25.6

'

'

'

'

'

'

'

'

'

'

'

'

Secured Debt, Repayments

'

2.6

'

'

'

'

'

'

'

'

'

'

'

'

Partners' Capital Account, Contributions

'

'

1.6

12.2

1.3

'

'

4.8

'

'

0.2

'

'

'

Outstanding Working Capital Advances At End Of Period

'

'

'

3.7

'

'

'

'

'

'

'

'

'

'

Repayment of Notes Receivable from Related Parties

'

'

'

'

'

4

'

'

'

'

'

'

'

'

Proceeds from Dividends Received

'

'

'

'

'

'

0.8

'

'

'

'

'

'

'

Business Acquisition, Percentage of Voting Interests Acquired

'

'

'

'

'

'

'

'

'

'

'

'

'

45.80%

Payments to Acquire Businesses, Gross

'

'

'

'

'

'

'

'

'

'

'

'

35.4

'

Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital

'

'

'

'

'

'

'

'

2.1

'

'

'

'

'

Payments for Advance to Affiliate

'

'

'

'

'

'

'

'

'

0.7

0.3

'

'

'

Guarantor Obligations, Maximum Exposure, Undiscounted

15.3

'

'

'

'

'

'

'

'

'

'

19

'

'

Allocable Share of Uncalled Capital

$2.40

'

'

'

'

'

'

'

'

'

'

'

'

'

Commitments_And_Contingencies_

Commitments And Contingencies (Narrative) (Details) (USD $)

Jun. 30, 2014

Dec. 31, 2010

Dec. 31, 2010

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2010

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Wunstell Action [Member]

Master Complaints [Member]

Multi-district Litigation [Member]

Darnell Alexander [Member]

Darnell Alexander [Member]

Abney Litigation [Member]

Abood Litigation [Member]

HEPACO Litigation [Member]

Prejean [Member]

Offshore Support Vessels [Member]

Inland River Liquid Tank Barges [Member]

Inland River Towboats [Member]

U.S.-flag Product Tankers [Member]

U.S. Flag Articulated Tug-Barge [Member]

Other Machinery and Equipment [Member]

Offshore Marine Services [Member]

plaintiff

plaintiff

claim

claim

claim

claim

claim

equipment

equipment

equipment

equipment

equipment

Loss Contingencies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total unfunded capital commitments

$412,800,000

'

'

'

'

'

'

'

'

'

$86,500,000

$1,100,000

$4,600,000

$230,200,000

$78,400,000

$12,000,000

'

Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year

99,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecorded Unconditional Purchase Obligation, Due within Two Years

303,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecorded Unconditional Purchase Obligation, Due within Three Years

9,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecorded Unconditional Purchase Obligation, Maximum Quantity

'

'

'

'

'

'

'

'

'

'

13

2

4

3

1

'

'

Claims Filed

'

2

1

10

410

117

668

174

'

330

'

'

'

'

'

'

'

Loss Contingency, Damages Sought, Value

'

'

'

'

'

'

'

'

20,291,178.92

'

'

'

'

'

'

'

'

Other Nonoperating Gains (Losses)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$14,700,000

Multiemployer_Pension_Plans_De

Multiemployer Pension Plans (Details) (American Maritime Officers Pension Plan [Member], USD $)	Sep. 30, 2013
In Millions, unless otherwise specified
American Maritime Officers Pension Plan [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Pension and other postretirement benefit plans, withdrawal liability	$46.50

LongTerm_Debt_Details

Long-Term Debt (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Debt Instrument [Line Items]	'	'
Letters of Credit Outstanding, Amount	$18,200,000	'
Repayments of Debt and Capital Lease Obligations	7,200,000	'
Net borrowings (repayments) on inventory financing arrangements	$6,294,000	($2,365,000)
Seven Point Three Seven Five Percentage Senior Notes Due Two Thousand Nineteen Member	'	'
Debt Instrument [Line Items]	'	'
Debt Instrument, Interest Rate, Stated Percentage	7.38%	'

Stock_Repurchases_Details

Stock Repurchases (Details) (USD $)	6 Months Ended		3 Months Ended
In Millions, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2014
			Subsequent Event [Member]
Common Stock, Par or Stated Value Per Share	$0.01	$0.01	'
Treasury Stock, Shares, Acquired	493,032	'	321,377
Treasury Stock, Value, Acquired, Cost Method	$39.20	'	$25.40
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$60.80	'	$150

Noncontrolling_Interests_in_Su2

Noncontrolling Interests in Subsidiaries (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling interests in subsidiaries	$101,699,000	$24,576,000	$101,699,000	$24,576,000	$24,576,000
Net Income (Loss)	27,525,000	19,296,000	41,240,000	-2,065,000	'
Net Income (Loss) Attributable to Noncontrolling Interest	6,458,000	25,000	8,664,000	-348,000	'
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	'	'	145,690,000	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	'	-3,110,000	'	'
Windcat Workboats Ltd. [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Assets, Net	31,000,000	'	31,000,000	'	'
Net Income (Loss)	'	'	-100,000	-2,700,000	'
Net Income (Loss) Attributable to Noncontrolling Interest	'	'	'	-700,000	'
Sea-Vista [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Assets, Net	148,700,000	'	148,700,000	'	'
Net Income (Loss)	'	'	4,100,000	'	'
Net Income (Loss) Attributable to Noncontrolling Interest	2,000,000	'	'	'	'
Illinois Corn Processing LLC [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling interests in subsidiaries	'	10,894,000	'	10,894,000	'
Assets, Net	62,500,000	'	62,500,000	'	'
Net Income (Loss)	'	'	23,800,000	-3,500,000	'
Net Income (Loss) Attributable to Noncontrolling Interest	6,000,000	'	'	-1,300,000	'
Offshore Marine Services [Member] | Windcat Workboats Ltd. [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	25.00%	'	25.00%	'	'
Noncontrolling interests in subsidiaries	7,761,000	7,541,000	7,761,000	7,541,000	'
Offshore Marine Services [Member] | Other Offshore Marine Services Noncontrolling Interests [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling interests in subsidiaries	1,233,000	1,600,000	1,233,000	1,600,000	'
Inland River Services [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	'	3,100,000	'	'
Payments for Repurchase of Redeemable Noncontrolling Interest	'	'	2,100,000	'	'
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	'	'	1,000,000	'	'
Inland River Services [Member] | Other Inland River Services Noncontrolling Interests [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling interests in subsidiaries	1,204,000	2,612,000	1,204,000	2,612,000	'
Shipping Services [Member] | Sea-Vista [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	49.00%	'	49.00%	'	'
Noncontrolling interests in subsidiaries	72,886,000	0	72,886,000	0	'
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	'	'	145,700,000	'	'
Payments of Stock Issuance Costs	'	'	3,200,000	'	'
Illinois Corn Processing LLC [Member] | Illinois Corn Processing LLC [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	30.00%	'	30.00%	'	'
Noncontrolling interests in subsidiaries	16,864,000	'	16,864,000	'	'
Other Segments [Member] | Other Noncontrolling Interests [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling interests in subsidiaries	$1,751,000	$1,929,000	$1,751,000	$1,929,000	'
Minimum [Member] | Offshore Marine Services [Member] | Other Offshore Marine Services Noncontrolling Interests [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	1.80%	'	1.80%	'	'
Minimum [Member] | Inland River Services [Member] | Other Inland River Services Noncontrolling Interests [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	3.00%	'	3.00%	'	'
Minimum [Member] | Other Segments [Member] | Other Noncontrolling Interests [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	5.00%	'	5.00%	'	'
Maximum [Member] | Offshore Marine Services [Member] | Other Offshore Marine Services Noncontrolling Interests [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	33.30%	'	33.30%	'	'
Maximum [Member] | Inland River Services [Member] | Other Inland River Services Noncontrolling Interests [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	51.80%	'	51.80%	'	'
Maximum [Member] | Other Segments [Member] | Other Noncontrolling Interests [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	18.90%	'	18.90%	'	'
U.S.-flag Product Tankers [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Unrecorded Unconditional Purchase Obligation, Maximum Quantity	3	'	3	'	'
U.S.-flag Product Tankers [Member] | Shipping Services [Member] | Sea-Vista [Member]	'	'	'	'	'
Noncontrolling Interests in Subsidiaries [Line Items]	'	'	'	'	'
Unrecorded Unconditional Purchase Obligation, Maximum Quantity	3	'	3	'	'

Earnings_Per_Common_Share_of_S2

Earnings Per Common Share of SEACOR (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]	'	'	'	'
Net Income (Loss) attributable to SEACOR Holdings Inc.	$21,067	$19,271	$32,576	($1,717)
Net Income (Loss) Available to Common Stockholders, Diluted	24,215	22,315	38,863	-1,717
Weighted Average Number of Shares Outstanding, Basic	19,989,402	19,825,229	20,049,056	19,782,318
Incremental Common Shares Attributable to Share-based Payment Arrangements	394,567	366,558	416,288	332,586
Incremental Common Shares Attributable to Conversion of Debt Securities	4,200,525	4,200,525	4,200,525	0
Weighted Average Number of Shares Outstanding, Diluted	24,584,494	24,392,312	24,665,869	20,114,904
Earnings Per Share, Basic	$1.05	$0.97	$1.62	($0.09)
Earnings Per Share, Diluted	$0.98	$0.91	$1.58	($0.09)
Outstanding Stock Awards [Member]	'	'	'	'
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	365,398	355,490	288,510	503,726
Two Point Five Percentage Convertible Notes [Member]	'	'	'	'
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	'	'	'	4,200,525
Three Point Zero Percentage Convertible Notes [Member]	'	'	'	'
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	'	'	1,825,326	'
Equity Securities [Member]	'	'	'	'
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]	'	'	'	'
Dilutive Securities, Effect on Basic Earnings Per Share	0	0	0	0
Convertible Debt Securities [Member]	'	'	'	'
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]	'	'	'	'
Dilutive Securities, Effect on Basic Earnings Per Share	$3,148	$3,044	$6,287	$0

Share_Based_Compensation_Share

Share Based Compensation (Share Based Compensation Plans) (Details)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Director stock awards granted	1,250
Employee Stock Purchase Plan shares issued	16,720
Restricted stock awards granted	147,645
Restricted stock awards forfeited	1,000
Shares released from Deferred Compensation Plan	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'
Stock Options, Outstanding as of December 31, 2013	1,481,280
Stock Option, Granted	106,925
Stock Option, Exercised	90,144
Stock Options, Outstanding as of June 30, 2014	1,498,061
Shares available for future grants and ESPP purchases as of June 30, 2014	1,236,955

Segment_Information_Operating_

Segment Information (Operating Results, Capital Expenditures And Assets By Reportable Segments) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]	'	'	'	'	'
Derivative gains (losses) on cash flow hedges	$50,000	$331,000	'	'	'
Operating Revenues	328,224,000	315,563,000	638,241,000	582,627,000	'
Costs and Expenses [Abstract]	'	'	'	'	'
Administrative and general	34,686,000	34,718,000	72,763,000	70,363,000	'
Depreciation and amortization	33,220,000	33,783,000	66,612,000	67,331,000	'
Total costs and expenses	299,812,000	308,614,000	590,257,000	578,720,000	'
Gain (Loss) on Sale of Assets and Asset Impairment Charges	4,295,000	12,305,000	8,973,000	14,320,000	'
Operating Income (Loss)	32,707,000	19,254,000	56,957,000	18,227,000	'
Other Income and Expenses [Abstract]	'	'	'	'	'
Derivative gains (losses), net	94,000	-825,000	-143,000	-2,932,000	'
Foreign currency gains (losses), net	1,720,000	-916,000	1,521,000	-4,927,000	'
Other Nonoperating Income (Expense)	10,213,000	195,000	6,558,000	198,000	'
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	-512,000	7,710,000	1,709,000	6,841,000	'
Income from Continuing Operations Before Income Tax Expense and Equity in Earnings of 50% or Less Owned Companies	41,037,000	19,561,000	58,906,000	6,741,000	'
Capital Expenditures	'	'	273,669,000	87,931,000	'
Property, Plant and Equipment, Gross	2,216,627,000	'	2,216,627,000	'	2,199,183,000
Accumulated depreciation	888,442,000	'	888,442,000	'	866,330,000
Property, Plant and Equipment, Net In Service	1,328,185,000	'	1,328,185,000	'	1,332,853,000
Construction in Progress, Gross	297,523,000	'	297,523,000	'	143,482,000
Net property and equipment	1,625,708,000	'	1,625,708,000	'	1,476,335,000
Inventories	20,207,000	'	20,207,000	'	27,615,000
Goodwill	18,012,000	'	18,012,000	'	17,985,000
Intangible Assets, Net	10,754,000	'	10,754,000	'	12,423,000
Total assets	3,295,993,000	2,768,333,000	3,295,993,000	2,768,333,000	3,116,233,000
Offshore Marine Services [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	138,214,000	138,650,000	267,171,000	262,642,000	'
Inland River Services [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	55,200,000	46,780,000	112,211,000	96,203,000	'
Shipping Services [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	53,575,000	48,103,000	105,976,000	94,579,000	'
Ethanol and Industrial Alcohol [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	72,798,000	61,378,000	'	'	'
Illinois Corn Processing LLC [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	'	'	131,454,000	94,227,000	'
Other Income and Expenses [Abstract]	'	'	'	'	'
Sales Revenue, Goods, Net	'	'	126,100,000	90,200,000	'
Cost of Goods Sold	'	'	98,200,000	89,400,000	'
Inventory, Raw Materials	2,200,000	2,800,000	2,200,000	2,800,000	'
Inventory, Work in Process	1,300,000	2,200,000	1,300,000	2,200,000	'
Other Segments [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	8,437,000	20,652,000	21,429,000	34,976,000	'
Corporate And Eliminations [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	0	0	0	0	'
Operating Segments [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	328,224,000	315,563,000	638,241,000	582,627,000	'
Costs and Expenses [Abstract]	'	'	'	'	'
Operating Expenses	231,906,000	240,113,000	450,882,000	441,026,000	'
Administrative and general	34,686,000	34,718,000	72,763,000	70,363,000	'
Depreciation and amortization	33,220,000	33,783,000	66,612,000	67,331,000	'
Total costs and expenses	299,812,000	308,614,000	590,257,000	578,720,000	'
Gain (Loss) on Sale of Assets and Asset Impairment Charges	4,295,000	12,305,000	8,973,000	14,320,000	'
Operating Income (Loss)	32,707,000	19,254,000	56,957,000	18,227,000	'
Other Income and Expenses [Abstract]	'	'	'	'	'
Derivative gains (losses), net	94,000	-825,000	-143,000	-2,932,000	'
Foreign currency gains (losses), net	1,720,000	-916,000	1,521,000	-4,927,000	'
Other Nonoperating Income (Expense)	10,213,000	195,000	6,558,000	198,000	'
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	-512,000	7,710,000	1,709,000	6,841,000	'
Capital Expenditures	'	'	273,669,000	87,931,000	'
Property, Plant and Equipment, Gross	2,216,627,000	2,212,929,000	2,216,627,000	2,212,929,000	'
Accumulated depreciation	888,442,000	806,672,000	888,442,000	806,672,000	'
Property, Plant and Equipment, Net In Service	1,328,185,000	1,406,257,000	1,328,185,000	1,406,257,000	'
Construction in Progress, Gross	297,523,000	133,985,000	297,523,000	133,985,000	'
Net property and equipment	1,625,708,000	1,540,242,000	1,625,708,000	1,540,242,000	'
Investments, at Equity, and Advances to 50% or Less Owned Companies	484,164,000	293,793,000	484,164,000	293,793,000	'
Inventories	20,207,000	22,955,000	20,207,000	22,955,000	'
Goodwill	18,012,000	17,978,000	18,012,000	17,978,000	'
Intangible Assets, Net	10,754,000	14,594,000	10,754,000	14,594,000	'
Other Current And Long-Term Assets, Excluding Cash And Near Cash Assets	311,256,000	289,573,000	311,256,000	289,573,000	'
Operating Segments [Member] | Offshore Marine Services [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	138,247,000	138,678,000	267,248,000	262,694,000	'
Costs and Expenses [Abstract]	'	'	'	'	'
Operating Expenses	93,755,000	97,581,000	187,798,000	187,612,000	'
Administrative and general	13,426,000	14,235,000	28,586,000	29,062,000	'
Depreciation and amortization	16,448,000	16,460,000	32,752,000	32,747,000	'
Total costs and expenses	123,629,000	128,276,000	249,136,000	249,421,000	'
Gain (Loss) on Sale of Assets and Asset Impairment Charges	3,526,000	7,895,000	11,264,000	10,234,000	'
Operating Income (Loss)	18,144,000	18,297,000	29,376,000	23,507,000	'
Other Income and Expenses [Abstract]	'	'	'	'	'
Derivative gains (losses), net	-70,000	175,000	-131,000	325,000	'
Foreign currency gains (losses), net	1,322,000	-833,000	1,429,000	-4,097,000	'
Other Nonoperating Income (Expense)	14,739,000	11,000	14,739,000	11,000	'
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	2,244,000	7,694,000	4,885,000	9,007,000	'
Segment Profit (Loss)	36,379,000	25,344,000	50,298,000	28,753,000	'
Capital Expenditures	'	'	46,621,000	49,764,000	'
Property, Plant and Equipment, Gross	1,154,174,000	1,151,751,000	1,154,174,000	1,151,751,000	'
Accumulated depreciation	499,092,000	439,211,000	499,092,000	439,211,000	'
Property, Plant and Equipment, Net In Service	655,082,000	712,540,000	655,082,000	712,540,000	'
Construction in Progress, Gross	91,824,000	90,847,000	91,824,000	90,847,000	'
Net property and equipment	746,906,000	803,387,000	746,906,000	803,387,000	'
Investments, at Equity, and Advances to 50% or Less Owned Companies	129,775,000	84,418,000	129,775,000	84,418,000	'
Inventories	5,571,000	5,885,000	5,571,000	5,885,000	'
Goodwill	13,367,000	13,367,000	13,367,000	13,367,000	'
Intangible Assets, Net	2,784,000	4,584,000	2,784,000	4,584,000	'
Other Current And Long-Term Assets, Excluding Cash And Near Cash Assets	154,188,000	146,551,000	154,188,000	146,551,000	'
Total assets	1,052,591,000	1,058,192,000	1,052,591,000	1,058,192,000	'
Operating Segments [Member] | Inland River Services [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	56,007,000	47,357,000	113,966,000	97,434,000	'
Costs and Expenses [Abstract]	'	'	'	'	'
Operating Expenses	45,047,000	35,193,000	84,721,000	71,582,000	'
Administrative and general	3,835,000	3,921,000	8,172,000	7,945,000	'
Depreciation and amortization	7,564,000	7,078,000	14,934,000	14,162,000	'
Total costs and expenses	56,446,000	46,192,000	107,827,000	93,689,000	'
Gain (Loss) on Sale of Assets and Asset Impairment Charges	810,000	4,296,000	1,663,000	4,993,000	'
Operating Income (Loss)	371,000	5,461,000	7,802,000	8,738,000	'
Other Income and Expenses [Abstract]	'	'	'	'	'
Derivative gains (losses), net	0	0	0	0	'
Foreign currency gains (losses), net	474,000	219,000	147,000	82,000	'
Other Nonoperating Income (Expense)	0	0	-38,000	0	'
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	-3,335,000	1,000	-3,747,000	-2,386,000	'
Segment Profit (Loss)	-2,490,000	5,681,000	4,164,000	6,434,000	'
Capital Expenditures	'	'	44,086,000	9,238,000	'
Property, Plant and Equipment, Gross	519,586,000	466,553,000	519,586,000	466,553,000	'
Accumulated depreciation	161,091,000	134,235,000	161,091,000	134,235,000	'
Property, Plant and Equipment, Net In Service	358,495,000	332,318,000	358,495,000	332,318,000	'
Construction in Progress, Gross	32,175,000	17,700,000	32,175,000	17,700,000	'
Net property and equipment	390,670,000	350,018,000	390,670,000	350,018,000	'
Investments, at Equity, and Advances to 50% or Less Owned Companies	61,653,000	55,875,000	61,653,000	55,875,000	'
Inventories	2,309,000	2,260,000	2,309,000	2,260,000	'
Goodwill	2,793,000	2,759,000	2,793,000	2,759,000	'
Intangible Assets, Net	7,085,000	8,416,000	7,085,000	8,416,000	'
Other Current And Long-Term Assets, Excluding Cash And Near Cash Assets	55,819,000	37,260,000	55,819,000	37,260,000	'
Total assets	520,329,000	456,588,000	520,329,000	456,588,000	'
Operating Segments [Member] | Shipping Services [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	53,575,000	48,103,000	105,976,000	94,579,000	'
Costs and Expenses [Abstract]	'	'	'	'	'
Operating Expenses	28,018,000	29,554,000	55,015,000	56,168,000	'
Administrative and general	5,421,000	6,124,000	11,317,000	11,301,000	'
Depreciation and amortization	7,115,000	7,907,000	14,869,000	15,704,000	'
Total costs and expenses	40,554,000	43,585,000	81,201,000	83,173,000	'
Gain (Loss) on Sale of Assets and Asset Impairment Charges	-41,000	114,000	-41,000	-2,955,000	'
Operating Income (Loss)	12,980,000	4,632,000	24,734,000	8,451,000	'
Other Income and Expenses [Abstract]	'	'	'	'	'
Derivative gains (losses), net	0	0	0	0	'
Foreign currency gains (losses), net	1,000	-8,000	-9,000	-15,000	'
Other Nonoperating Income (Expense)	158,000	188,000	-3,775,000	202,000	'
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	1,564,000	-403,000	2,317,000	-1,908,000	'
Segment Profit (Loss)	14,703,000	4,409,000	23,267,000	6,730,000	'
Capital Expenditures	'	'	165,160,000	27,048,000	'
Property, Plant and Equipment, Gross	451,123,000	517,409,000	451,123,000	517,409,000	'
Accumulated depreciation	200,908,000	214,372,000	200,908,000	214,372,000	'
Property, Plant and Equipment, Net In Service	250,215,000	303,037,000	250,215,000	303,037,000	'
Construction in Progress, Gross	171,204,000	22,037,000	171,204,000	22,037,000	'
Net property and equipment	421,419,000	325,074,000	421,419,000	325,074,000	'
Investments, at Equity, and Advances to 50% or Less Owned Companies	205,110,000	66,786,000	205,110,000	66,786,000	'
Inventories	1,438,000	1,427,000	1,438,000	1,427,000	'
Goodwill	1,852,000	1,852,000	1,852,000	1,852,000	'
Intangible Assets, Net	575,000	1,134,000	575,000	1,134,000	'
Other Current And Long-Term Assets, Excluding Cash And Near Cash Assets	19,816,000	16,021,000	19,816,000	16,021,000	'
Total assets	650,210,000	412,294,000	650,210,000	412,294,000	'
Operating Segments [Member] | Ethanol and Industrial Alcohol [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	72,798,000	61,378,000	'	'	'
Costs and Expenses [Abstract]	'	'	'	'	'
Operating Expenses	56,429,000	59,402,000	'	'	'
Administrative and general	594,000	477,000	'	'	'
Depreciation and amortization	1,010,000	1,489,000	'	'	'
Total costs and expenses	58,033,000	61,368,000	'	'	'
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	0	'	'	'
Operating Income (Loss)	14,765,000	10,000	'	'	'
Other Income and Expenses [Abstract]	'	'	'	'	'
Derivative gains (losses), net	-1,519,000	473,000	'	'	'
Foreign currency gains (losses), net	0	0	'	'	'
Other Nonoperating Income (Expense)	300,000	0	'	'	'
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	0	0	'	'	'
Segment Profit (Loss)	13,546,000	483,000	'	'	'
Operating Segments [Member] | Illinois Corn Processing LLC [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	'	'	131,454,000	94,227,000	'
Costs and Expenses [Abstract]	'	'	'	'	'
Operating Expenses	'	'	103,703,000	93,447,000	'
Administrative and general	'	'	1,105,000	1,138,000	'
Depreciation and amortization	'	'	2,000,000	2,978,000	'
Total costs and expenses	'	'	106,808,000	97,563,000	'
Gain (Loss) on Sale of Assets and Asset Impairment Charges	'	'	0	0	'
Operating Income (Loss)	'	'	24,646,000	-3,336,000	'
Other Income and Expenses [Abstract]	'	'	'	'	'
Derivative gains (losses), net	'	'	-801,000	512,000	'
Foreign currency gains (losses), net	'	'	0	0	'
Other Nonoperating Income (Expense)	'	'	493,000	0	'
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	'	'	0	0	'
Segment Profit (Loss)	'	'	24,338,000	-2,824,000	'
Capital Expenditures	'	'	2,098,000	217,000	'
Property, Plant and Equipment, Gross	44,808,000	44,006,000	44,808,000	44,006,000	'
Accumulated depreciation	13,369,000	8,614,000	13,369,000	8,614,000	'
Property, Plant and Equipment, Net In Service	31,439,000	35,392,000	31,439,000	35,392,000	'
Construction in Progress, Gross	2,156,000	0	2,156,000	0	'
Net property and equipment	33,595,000	35,392,000	33,595,000	35,392,000	'
Investments, at Equity, and Advances to 50% or Less Owned Companies	0	0	0	0	'
Inventories	9,926,000	12,164,000	9,926,000	12,164,000	'
Goodwill	0	0	0	0	'
Intangible Assets, Net	0	50,000	0	50,000	'
Other Current And Long-Term Assets, Excluding Cash And Near Cash Assets	13,559,000	10,925,000	13,559,000	10,925,000	'
Total assets	57,080,000	58,531,000	57,080,000	58,531,000	'
Operating Segments [Member] | Other Segments [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	8,437,000	20,652,000	21,429,000	34,976,000	'
Costs and Expenses [Abstract]	'	'	'	'	'
Operating Expenses	9,464,000	18,960,000	21,400,000	33,448,000	'
Administrative and general	3,449,000	1,323,000	6,560,000	2,979,000	'
Depreciation and amortization	82,000	96,000	167,000	195,000	'
Total costs and expenses	12,995,000	20,379,000	28,127,000	36,622,000	'
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	0	-409,000	1,907,000	'
Operating Income (Loss)	-4,558,000	273,000	-7,107,000	261,000	'
Other Income and Expenses [Abstract]	'	'	'	'	'
Derivative gains (losses), net	1,500,000	-450,000	767,000	392,000	'
Foreign currency gains (losses), net	53,000	-169,000	62,000	-336,000	'
Other Nonoperating Income (Expense)	-5,013,000	0	-4,838,000	54,000	'
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	-985,000	418,000	-1,746,000	2,128,000	'
Segment Profit (Loss)	-9,003,000	72,000	-12,862,000	2,499,000	'
Capital Expenditures	'	'	123,000	357,000	'
Property, Plant and Equipment, Gross	3,760,000	3,989,000	3,760,000	3,989,000	'
Accumulated depreciation	769,000	531,000	769,000	531,000	'
Property, Plant and Equipment, Net In Service	2,991,000	3,458,000	2,991,000	3,458,000	'
Construction in Progress, Gross	224,000	2,087,000	224,000	2,087,000	'
Net property and equipment	3,215,000	5,545,000	3,215,000	5,545,000	'
Investments, at Equity, and Advances to 50% or Less Owned Companies	87,626,000	86,714,000	87,626,000	86,714,000	'
Inventories	963,000	1,219,000	963,000	1,219,000	'
Goodwill	0	0	0	0	'
Intangible Assets, Net	310,000	410,000	310,000	410,000	'
Other Current And Long-Term Assets, Excluding Cash And Near Cash Assets	49,232,000	56,591,000	49,232,000	56,591,000	'
Total assets	141,346,000	150,479,000	141,346,000	150,479,000	'
Operating Segments [Member] | Corporate And Eliminations [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	-840,000	-605,000	-1,832,000	-1,283,000	'
Costs and Expenses [Abstract]	'	'	'	'	'
Operating Expenses	-807,000	-577,000	-1,755,000	-1,231,000	'
Administrative and general	7,961,000	8,638,000	17,023,000	17,938,000	'
Depreciation and amortization	1,001,000	753,000	1,890,000	1,545,000	'
Total costs and expenses	8,155,000	8,814,000	17,158,000	18,252,000	'
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	0	-3,504,000	141,000	'
Operating Income (Loss)	-8,995,000	-9,419,000	-22,494,000	-19,394,000	'
Other Income and Expenses [Abstract]	'	'	'	'	'
Derivative gains (losses), net	183,000	-1,023,000	22,000	-4,161,000	'
Foreign currency gains (losses), net	-130,000	-125,000	-108,000	-561,000	'
Other Nonoperating Income (Expense)	29,000	-4,000	-23,000	-69,000	'
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	0	0	0	0	'
Capital Expenditures	'	'	'	1,307,000	'
Property, Plant and Equipment, Gross	43,176,000	29,221,000	43,176,000	29,221,000	'
Accumulated depreciation	13,213,000	9,709,000	13,213,000	9,709,000	'
Property, Plant and Equipment, Net In Service	29,963,000	19,512,000	29,963,000	19,512,000	'
Construction in Progress, Gross	'	1,314,000	'	1,314,000	'
Net property and equipment	29,903,000	20,826,000	29,903,000	20,826,000	'
Investments, at Equity, and Advances to 50% or Less Owned Companies	0	0	0	0	'
Inventories	0	0	0	0	'
Goodwill	0	0	0	0	'
Intangible Assets, Net	0	0	0	0	'
Other Current And Long-Term Assets, Excluding Cash And Near Cash Assets	18,642,000	22,225,000	18,642,000	22,225,000	'
Intersegment Eliminations [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	0	0	0	0	'
Intersegment Eliminations [Member] | Offshore Marine Services [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	-33,000	28,000	-77,000	52,000	'
Intersegment Eliminations [Member] | Inland River Services [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	-807,000	577,000	-1,755,000	1,231,000	'
Intersegment Eliminations [Member] | Shipping Services [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	0	0	0	0	'
Intersegment Eliminations [Member] | Ethanol and Industrial Alcohol [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	0	0	'	'	'
Intersegment Eliminations [Member] | Illinois Corn Processing LLC [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	'	'	0	0	'
Intersegment Eliminations [Member] | Other Segments [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	0	0	0	0	'
Intersegment Eliminations [Member] | Corporate And Eliminations [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Revenues	840,000	-605,000	1,832,000	-1,283,000	'
Segment Reconciling Items [Member]	'	'	'	'	'
Other Income and Expenses [Abstract]	'	'	'	'	'
Other Income (Expense) not included in Segment Profit	3,697,000	-1,853,000	5,987,000	3,825,000	'
Less Equity Earnings (Loss) included in Segment Profit	512,000	-7,710,000	-1,709,000	-6,841,000	'
Cash And Near Cash Assets	825,892,000	589,198,000	825,892,000	589,198,000	'
Assets of Disposal Group, Including Discontinued Operation	'	0	'	0	'
Interest Rate Swap Agreements [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Derivative gains (losses) on cash flow hedges	'	'	($23,000)	$380,000	'

Discontinued_Operations_Detail

Discontinued Operations (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating Revenues	$328,224	$315,563	$638,241	$582,627
Administrative and general	34,686	34,718	72,763	70,363
Depreciation and amortization	33,220	33,783	66,612	67,331
Total costs and expenses	299,812	308,614	590,257	578,720
Gain (Loss) on Sale of Assets and Asset Impairment Charges	4,295	12,305	8,973	14,320
Operating Income (Loss)	32,707	19,254	56,957	18,227
Nonoperating Income (Expense)	8,330	307	1,949	-11,486
Income Tax Expense (Benefit)	-13,000	-7,975	-19,375	-5,322
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	-512	7,710	1,709	6,841
Net Income (Loss)	27,525	19,296	41,240	-2,065
SES Business [Member]	'	'	'	'
Nonoperating Income (Expense)	'	'	'	-1,537
Income Tax Expense (Benefit)	'	'	'	538
Net Income (Loss)	'	'	'	-999
SEI [Member]	'	'	'	'
Nonoperating Income (Expense)	'	'	'	-143
Income Tax Expense (Benefit)	'	'	'	50
Net Income (Loss)	'	'	'	-93
Era Group [Member]	'	'	'	'
Operating Revenues	'	'	'	22,892
Operating Expenses	'	'	'	14,076
Administrative and general	'	'	'	2,653
Depreciation and amortization	'	'	'	3,875
Total costs and expenses	'	'	'	20,604
Gain (Loss) on Sale of Assets and Asset Impairment Charges	'	'	'	548
Operating Income (Loss)	'	'	'	2,836
Nonoperating Income (Expense)	'	'	'	-1,316
Income Tax Expense (Benefit)	'	'	'	-10,818
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	'	'	'	65
Net Income (Loss)	'	'	'	($9,233)