Quarterly Financial Information (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Revenues	$ 327,861,000	$ 336,784,000	$ 315,563,000	$ 267,064,000	$ 362,368,000	$ 338,855,000	$ 309,225,000	$ 297,849,000	$ 1,247,272,000	$ 1,308,297,000	$ 1,032,497,000
Operating Income (Loss)	30,307,000	51,508,000	19,254,000	(1,027,000)	9,332,000	20,058,000	(1,499,000)	28,514,000	100,042,000	56,405,000	67,138,000
Income (Loss) from Continuing Operations	9,120,000	30,769,000	19,296,000	(11,036,000)	(12,295,000)	9,239,000	6,495,000	21,188,000	48,149,000	24,627,000	10,367,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	0	0	10,225,000	(9,618,000)	(6,265,000)	(4,804,000)	(15,185,000)	10,225,000		(31,783,000)
Income (Loss) from Discontinued Operations, Net of Tax				(10,325,000)	9,578,000				(10,325,000)	35,832,000	31,783,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	9,120,000	30,769,000	19,296,000	(21,361,000)	(2,717,000)	15,504,000	11,299,000	36,373,000	37,824,000	60,459,000	42,150,000
Net Income attributable to SEACOR Holdings Inc.	(8,396,000)	(30,291,000)	(19,271,000)	20,988,000		(16,102,000)	(11,249,000)	(36,488,000)	(36,970,000)	(61,215,000)	(41,056,000)
Income (Loss) from Continuing Operations Attributable to Parent	(8,396,000)	(30,291,000)	(19,271,000)	10,763,000	12,242,000	(9,837,000)	(6,445,000)	(21,303,000)			(9,273,000)
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.42	$ 1.52	$ 0.97	$ (0.55)	$ (0.61)	$ 0.48	$ 0.31	$ 1.04	$ 2.37	$ 1.24	$ 0.44
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$ 0.00	$ 0.00	$ 0.00	$ (0.51)	$ 0.48	$ 0.31	$ 0.24	$ 0.74	$ (0.51)	$ 1.76	$ 1.50
Basic Earnings Per Common Share of SEACOR Holdings Inc.	$ 0.42	$ 1.52	$ 0.97	$ (1.06)	$ (0.13)	$ 0.79	$ 0.55	$ 1.78	$ 1.86	$ 3.00	$ 1.94
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.41)	$ (1.36)	$ (0.91)	$ 0.55	$ 0.61	$ (0.47)	$ (0.31)	$ (1.02)	$ (2.32)	$ (1.22)	$ (0.43)
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.00	$ 0.00	$ 0.51	$ (0.48)	$ (0.31)	$ (0.23)	$ (0.73)	$ 0.50	$ (1.73)	$ (1.48)
Diluted Earnings Per Common Share of SEACOR Holdings Inc.	$ (0.41)	$ (1.36)	$ (0.91)	$ 1.06	$ 0.13	$ (0.78)	$ (0.54)	$ (1.75)	$ (1.82)	$ (2.95)	$ (1.91)
Era Group [Member]
Operating Revenues									22,892,000	272,921,000	258,148,000
Operating Income (Loss)									2,836,000	32,051,000	36,108,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									(9,233,000)	9,047,000	23,448,000
Liability for Uncertain Tax Positions, Current	10,100,000								10,100,000
Scenario, Previously Reported [Member]
Operating Revenues				267,064,000
Operating Income (Loss)				(1,027,000)
Income (Loss) from Continuing Operations				(11,036,000)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent				111,000
Income (Loss) from Discontinued Operations, Net of Tax				(211,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest				(10,874,000)
Net Income attributable to SEACOR Holdings Inc.				10,874,000
Income (Loss) from Continuing Operations Attributable to Parent				$ 10,763,000
Income (Loss) from Continuing Operations, Per Basic Share				$ (0.55)
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share				$ 0.00
Basic Earnings Per Common Share of SEACOR Holdings Inc.				$ (0.55)
Income (Loss) from Continuing Operations, Per Diluted Share				$ 0.55
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share				$ 0.00
Diluted Earnings Per Common Share of SEACOR Holdings Inc.				$ 0.55