Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Income	$ 19,296	$ 11,299	$ (2,065)	$ 47,672
Other Comprehensive Income (Loss):
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(340)	(1,415)	(4,538)	1,785
Reclassification of net foreign currency translation losses to foreign currency gains, net	0	0	0	758
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	331	(195)
Reclassification of net derivative losses on cash flow hedges to interest expense or equity in earnings of 50% or less owned companies			0	(19)
Other	0	0	0	42
Other Comprehensive Income (Loss), before Tax	142	(805)	(3,840)	3,429
Income tax expense	41	(249)	(1,186)	1,145
Other Comprehensive Income (Loss), Net of Tax	101	(556)	(2,654)	2,284
Comprehensive Income	19,397	10,743	(4,719)	49,956
Comprehensive Income attributable to Noncontrolling Interests in Subsidiaries	48	(44)	(800)	92
Comprehensive Income attributable to SEACOR Holdings Inc.	19,349	10,787	(3,919)	49,864
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	151	145	318	219
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	$ 0	$ 660	$ 0	$ 1,296