Condensed Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Operating Revenues	$ 338,936	$ 336,784	$ 977,177	$ 919,411
Costs and Expenses [Abstract]
Operating	237,676	239,540	688,558	680,566
Administrative and general	46,655	31,463	119,418	101,826
Depreciation and amortization	33,604	33,503	100,216	100,834
Total costs and expenses	317,935	304,506	908,192	883,226
Gain (Loss) on Sale of Assets and Asset Impairment Charges	29,869	19,230	38,842	33,550
Operating Income (Loss)	50,870	51,508	107,827	69,735
Other Income (Expense):
Interest income	4,463	4,280	14,536	10,665
Interest expense	11,124	10,520	32,985	31,282
Marketable security gains, net	9,693	(1,149)	15,494	9,403
Derivative losses, net	(2,538)	(303)	(2,681)	(3,235)
Foreign currency losses, net	(3,059)	2,230	(1,538)	(2,697)
Other, net	111	477	6,669	675
Total Other Nonoperating Income (Expense)	(2,454)	(4,985)	(505)	(16,471)
Income from Continuing Operations Before Income Tax Expense and Equity in Earnings of 50% or Less Owned Companies	48,416	46,523	107,322	53,264
Income Tax Expense (Benefit)	15,610	15,984	34,985	21,306
Income from Continuing Operations Before Equity in Earnings of 50% or Less Owned Companies	32,806	30,539	72,337	31,958
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	972	230	2,681	7,071
Income from Continuing Operations	33,778	30,769	75,018	39,029
Income (Loss) from Discontinued Operations, Net of Tax	0	0	0	(10,325)
Net Income (Loss)	33,778	30,769	75,018	28,704
Net Income (Loss) Attributable to Noncontrolling Interest	6,315	478	14,979	130
Net Income (Loss) attributable to SEACOR Holdings Inc.	27,463	30,291	60,039	28,574
Net Income (Loss) attributable to SEACOR Holdings Inc.:
Continuing operations	27,463	30,291	60,039	38,799
Discontinued operations, net of tax	0	0	0	(10,225)
Net Income (Loss) attributable to SEACOR Holdings Inc.	$ 27,463	$ 30,291	$ 60,039	$ 28,574
Basic Earnings Per Common Share of SEACOR Holdings Inc.
Continuing operations	$ 1.43	$ 1.52	$ 3.04	$ 1.96
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ (0.52)
Earnings Per Share, Basic	$ 1.43	$ 1.52	$ 3.04	$ 1.44
Diluted Earnings Per Common Share of SEACOR Holdings Inc.
Continuing operations	$ 1.28	$ 1.36	$ 2.85	$ 1.92
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ (0.51)
Earnings Per Share, Diluted	$ 1.28	$ 1.36	$ 2.85	$ 1.41
Weighted Average Common Shares Outstanding:
Basic	19,196,121	19,964,695	19,761,620	19,843,778
Diluted	25,627,742	24,601,584	24,374,918	20,198,449