Long-Term Debt (Narrative) (Senior Notes And Convertible Debentures) (Details) (USD $)	12 Months Ended							0 Months Ended		3 Months Ended	12 Months Ended								12 Months Ended						12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Three Point Zero Percentage Convertible Notes [Member]	Nov. 13, 2013 Three Point Zero Percentage Convertible Notes [Member]	Dec. 31, 2012 Three Point Zero Percentage Convertible Notes [Member]	Nov. 13, 2013 Three Point Zero Percentage Convertible Notes [Member] Additional Paid-In Capital [Member]	Dec. 31, 2012 Two Point Five Percentage Convertible Notes [Member]	Dec. 15, 2012 Two Point Five Percentage Convertible Notes [Member]	Mar. 31, 2013 Two Point Five Percentage Convertible Notes [Member]	Dec. 31, 2012 Two Point Five Percentage Convertible Notes [Member]	Dec. 31, 2013 Two Point Five Percentage Convertible Notes [Member]	Dec. 11, 2012 Two Point Five Percentage Convertible Notes [Member]	Dec. 11, 2012 Two Point Five Percentage Convertible Notes [Member] Additional Paid-In Capital [Member]	Dec. 31, 2013 7.375% Senior Notes [Member]	Sep. 24, 2009 7.375% Senior Notes [Member]	Dec. 31, 2013 Title XI Bonds [Member]	Dec. 31, 2012 Title XI Bonds [Member]	Dec. 31, 2013 Other Debt Obligations [Member]	Dec. 31, 2012 Other Debt Obligations [Member]	Dec. 31, 2011 Other Debt Obligations [Member]	Dec. 31, 2012 5.875% Senior Notes [Member]	Dec. 31, 2011 5.875% Senior Notes [Member]	Oct. 01, 2002 5.875% Senior Notes [Member]	Dec. 31, 2012 Seacor Revolving Credit Facility [Member]	Dec. 31, 2011 Seacor Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	$ 99,839,000	$ 61,011,000		$ 47,770,257								$ 40,442,031			$ 1,041,777		$ 9,265,586		$ 728,339
Debt instrument, stated percentage					3.00%								2.50%			7.375%	6.50%							5.875%
Proceeds from issuance of long-term debt, net of offering costs				223,700,000							340,600,000.0								1,500,000	6,700,000	23,000,000
Repayments of Other Debt																			9,700,000	24,500,000	28,700,000
Bond Redemption Percentage				100.00%							100.00%
Redemption Premium											55
Payments of Debt Issuance Costs				6,300,000							9,400,000.0
Contingent Interest Rate					0.45%								0.25%
Aggregate principal amount					230,000,000								350,000,000.0			250,000,000								200,000,000
Aggregate purchase price of senior notes																						5,700,000	2,300,000
Debt extinguishment gains (losses), net	0	(160,000)	(99,000)																			200,000	100,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum																			1.10%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum																			5.00%
Repayments of Long-term Debt																						171,000,000
Extinguishment of Debt, Amount																						5,500,000	2,200,000
Net assets																	60,700,000
Net property and equipment	1,476,335,000	1,584,876,000	1,440,657,000														119,800,000
Letters of credit outstanding amount	27,100,000
Bond Trading Price Triggering Contingent Interest, Minimum				1,200							1,200
Individual Bond, Face Value					1,000								1,000
Convertible Securities	0	0		1,825,326						4,200,525
Debt Instrument, Convertible, Conversion Ratio				7.9362				9.2089	8.6879
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger											130.00%
Common Stock Sales Price Premium Over Conversion Price, Minimum											130.00%
Convertible Debt				230,000,000	181,500,000	0		350,000,000			350,000,000	350,000,000	300,400,000
Deferred Finance Costs, Gross					5,000,000		1,300,000						8,100,000	1,300,000
Debt Instrument, Interest Rate, Effective Percentage					7.40%			6.50%			6.50%
Debt Instrument, Convertible, Carrying Amount of Equity Component					48,500,000									49,600,000.0
Repayments of Lines of Credit																									175,000,000
Proceeds from Lines of Credit																										50,000,000
Bond Reserve Fund Balance	9,600,000
Restricted Cash and Cash Equivalents																	$ 12,200,000	$ 27,300,000