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Nature Of Operations And Accounting Policies (Schedule Of Earnings Per Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 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
Dec. 31, 2013
Deferred Compensation, Share-based Payments [Member]
Dec. 31, 2012
Deferred Compensation, Share-based Payments [Member]
Dec. 31, 2011
Deferred Compensation, Share-based Payments [Member]
Dec. 31, 2013
Stock Compensation Plan [Member]
Dec. 31, 2012
Stock Compensation Plan [Member]
Dec. 31, 2011
Stock Compensation Plan [Member]
Dec. 31, 2013
Three Point Zero Percentage Convertible Notes [Member]
Mar. 31, 2013
Two Point Five Percentage Convertible Notes [Member]
Dec. 11, 2012
Two Point Five Percentage Convertible Notes [Member]
Dec. 31, 2013
Three Point Zero Percentage Convertible Notes [Member]
Nov. 13, 2013
Three Point Zero Percentage Convertible Notes [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                                            
Net Income attributable to SEACOR Holdings Inc. $ 8,396 $ 30,291 $ 19,271 $ (20,988)   $ 16,102 $ 11,249 $ 36,488 $ 36,970 $ 61,215 $ 41,056                      
Dilutive Securities, Effect on Basic Earnings Per Share                       0 0 0                
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities                 0 0                        
Net Income (Loss) Available to Common Stockholders, Diluted                 $ 36,970 $ 61,215 $ 41,056                      
Average o/s Shares, Basic                 19,893,954 20,426,770 21,119,461                      
Incremental Common Shares Attributable to Share-based Payment Arrangements                 399,333 349,126 347,382                      
Convertible Securities                 0 0                 4,200,525   1,825,326  
Average o/s Shares, Diluted                 20,293,287 20,775,896 21,466,843                      
Per Share, Basic $ 0.42 $ 1.52 $ 0.97 $ (1.06) $ (0.13) $ 0.79 $ 0.55 $ 1.78 $ 1.86 $ 3.00 $ 1.94                      
Per Share, Diluted $ 0.41 $ 1.36 $ 0.91 $ (1.06) $ (0.13) $ 0.78 $ 0.54 $ 1.75 $ 1.82 $ 2.95 $ 1.91                      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount                 4,200,525 176,609         133,315 549,223 338,920 240,043        
Debt Instrument, Interest Rate, Stated Percentage                                       2.50%   3.00%