Condensed Consolidated Statements of Comprehensive Loss Statement - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net Loss	$ (50,933)	$ (8,501)	$ (71,457)	$ (26,402)
Foreign currency translation gains (losses)	(4,468)	4,289	(6,336)	555
Derivative losses on cash flow hedges	(1,838)	(288)	(3,668)	(685)
Reclassification of derivative losses on cash flow hedges to equity in earnings (losses) of 50% or less owned companies	1,102	563	1,326	711
Other	(4)	0	(9)	0
Other Comprehensive Loss, before Tax	(5,208)	4,564	(8,687)	581
Income tax benefit (expense)	1,640	(1,434)	2,794	(179)
Other Comprehensive Loss, Net of Tax	(3,568)	3,130	(5,893)	402
Comprehensive Loss	(54,501)	(5,371)	(77,350)	(26,000)
Comprehensive Income (Loss) attributable to Noncontrolling Interests in Subsidiaries	3,704	(8,723)	10,185	(7,451)
Comprehensive Income (Loss) attributable to SEACOR Holdings Inc.	$ (58,205)	$ 3,352	$ (87,535)	$ (18,549)