Earnings Per Common Share of SEACOR (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Outstanding Stock Awards [Member]	Sep. 30, 2013 Outstanding Stock Awards [Member]	Sep. 30, 2014 Outstanding Stock Awards [Member]	Sep. 30, 2013 Outstanding Stock Awards [Member]	Jun. 30, 2013 Two Point Five Percentage Convertible Notes [Member]	Jun. 30, 2014 Three Point Zero Percentage Convertible Notes [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount					457,651	115,832	330,918	303,313	4,200,525	1,825,326
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Net Income (Loss) attributable to SEACOR Holdings Inc.	$ 27,463,000	$ 30,291,000	$ 60,039,000	$ 28,574,000
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units	0	0	0	0
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities	5,320,000	3,086,000	9,481,000	0
Net Income (Loss) Available to Common Stockholders, Diluted	$ 32,783,000	$ 33,377,000	$ 69,520,000	$ 28,574,000
Weighted Average Number of Shares Outstanding, Basic	19,196,121	19,964,695	19,761,620	19,843,778
Incremental Common Shares Attributable to Share-based Payment Arrangements	405,770	436,364	412,773	354,671
Incremental Common Shares Attributable to Conversion of Debt Securities	6,025,851	4,200,525	4,200,525	0
Weighted Average Number of Shares Outstanding, Diluted	25,627,742	24,601,584	24,374,918	20,198,449
Earnings Per Share, Basic	$ 1.43	$ 1.52	$ 3.04	$ 1.44
Earnings Per Share, Diluted	$ 1.28	$ 1.36	$ 2.85	$ 1.41