Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Operating Revenues	$ 1,247,272	$ 1,308,297	$ 1,032,497
Costs and Expenses:
Operating Costs and Expenses	908,871	977,469	745,553
Administrative and general	141,348	166,743	131,772
Depreciation and amortization	134,518	131,667	106,873
Total costs and expenses	1,184,737	1,275,879	984,198
Gain (Loss) on Sale of Assets and Asset Impairment Charges	37,507	23,987	18,839
Operating Income (Loss)	100,042	56,405	67,138
Other Income (Expense):
Interest income	15,467	17,360	12,879
Interest expense	(42,592)	(37,891)	(39,759)
Debt extinguishment gains (losses), net	0	(160)	(99)
Marketable security gains (losses), net	5,803	12,891	(7,893)
Derivative gains (losses), net	(8,323)	(2,812)	(30,055)
Foreign currency gains (losses), net	(3,351)	1,631	540
Other, net	586	7,148	1,018
Nonoperating Income (Expense)	(32,410)	(1,833)	(63,369)
Income Before Income Tax Expense (Benefit) and Equity in Earnings of 50% or Less Owned Companies	67,632	54,572	3,769
Income Tax Expense (Benefit):
Current	16,176	47,582	30,569
Deferred	10,571	(23,401)	(27,259)
Income Tax Expense (Benefit)	26,747	24,181	3,310
Income from Continuing Operations Before Equity in Earnings of 50% or Less Owned Companies	40,885	30,391	459
Income (Loss) from Equity Method Investments	7,264	(5,764)	9,908
Income from Continuing Operations	48,149	24,627	10,367
Income (Loss) from Discontinued Operations, Net of Tax	(10,325)	35,832	31,783
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(10,225)		31,783
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	37,824	60,459	42,150
Net Income (Loss) Attributable to Noncontrolling Interest	854	(756)	1,094
Net Income attributable to SEACOR Holdings Inc.	36,970	61,215	41,056
Income (Loss) from Continuing Operations Attributable to Parent			$ 9,273
Income (Loss) from Continuing Operations, Per Basic Share	$ 2.37	$ 1.24	$ 0.44
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$ (0.51)	$ 1.76	$ 1.50
Basic Earnings Per Common Share of SEACOR Holdings Inc.	$ 1.86	$ 3.00	$ 1.94
Income (Loss) from Continuing Operations, Per Diluted Share	$ 2.32	$ 1.22	$ 0.43
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$ (0.50)	$ 1.73	$ 1.48
Diluted Earnings Per Common Share of SEACOR Holdings Inc.	$ 1.82	$ 2.95	$ 1.91
Weighted Average Common Shares Outstanding:
Basic	19,893,954	20,426,770	21,119,461
Diluted	20,293,287	20,775,896	21,466,843
Common Stock, Dividends, Per Share, Cash Paid	$ 0.00	$ 5.00	$ 0.00