Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Income	$ 15,504	$ 4,062	$ 63,176	$ 24,898
Other Comprehensive Income (Loss):
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	2,123	(3,760)	3,908	(2,015)
Reclassification of net foreign currency translation losses to foreign currency gains, net	0	0	758	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	(491)	(1,154)	(1,238)
Reclassification of net derivative losses on cash flow hedges to interest expense or equity in earnings of 50% or less owned companies			1,330	0
Other	0	0	42	0
Other Comprehensive Income (Loss), before Tax	3,656	(4,309)	7,085	(4,007)
Income tax expense	(1,200)	1,508	(2,345)	1,402
Other Comprehensive Income (Loss), Net of Tax	2,456	(2,801)	4,740	(2,605)
Comprehensive Income	17,960	1,261	67,916	22,293
Comprehensive Income attributable to Noncontrolling Interests in Subsidiaries	(369)	247	(277)	882
Comprehensive Income attributable to SEACOR Holdings Inc.	18,329	1,014	68,193	21,411
Interest Expense [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	694	605	2,285	1,456
Gain (Loss) on Derivatives [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	$ 1,330	$ 0	$ (1,330)	$ 0