Basis of Presentation and Accounting Policy (Tables)

6 Months Ended

Jun. 30, 2013

Nature Of Operations And Accounting Policies [Abstract]

Deferred Revenues Included In Other Current Liabilities

Deferred revenues, included in other current liabilities, for the six months ended June 30 were as follows (in thousands):

	2013		2012
Balance at beginning of period	$	6,592	$	9,845
Revenues deferred during the period	—		2,600
Revenues recognized during the period	—		(5,927		)
Balance at end of period	$	6,592	$	6,518

Comprehensive Income (Loss) Note [Text Block]

Accumulated Other Comprehensive Loss. The components of accumulated other comprehensive income (loss) were as follows:

	SEACOR Holdings Inc. Stockholders Equity												Noncontrolling Interests
	Foreign Currency Translation Adjustments			Derivative Losses on Cash Flow Hedges, net			Other			Total			Foreign Currency Translation Adjustments			Other			Other Comprehensive Income (Loss)
December 31, 2012	$	(1,238	)	$	(732	)	$	(16	)	$	(1,986	)	$	321		$	(10	)
Distribution of Era Group stock to shareholders	(55		)	—			—			(55		)	—			—
Other comprehensive income (loss)	(4,086		)	698			—			(3,388		)	(452		)	—			$	(3,840	)
Income tax (expense) benefit	1,430			(244		)	—			1,186			—			—			1,186
Six months ended June 30, 2013	$	(3,949	)	$	(278	)	$	(16	)	$	(4,243	)	$	(131	)	$	(10	)	$	(2,654	)