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Savings Plans And Multiemployer Pension Plans (Details)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Seacor Savings Plan [Member]
USD ($)
Dec. 31, 2012
Seacor Savings Plan [Member]
USD ($)
Dec. 31, 2011
Seacor Savings Plan [Member]
USD ($)
Dec. 31, 2013
SEACOR Deferred Compensation Plan [Member]
USD ($)
Dec. 31, 2012
SEACOR Deferred Compensation Plan [Member]
USD ($)
Dec. 31, 2013
MNOPF [member]
USD ($)
Dec. 31, 2011
MNOPF [member]
USD ($)
Dec. 31, 2011
MNRPF [Member]
USD ($)
Dec. 31, 2013
MNRPF [Member]
USD ($)
Dec. 31, 2013
MNRPF [Member]
GBP (£)
Dec. 31, 2012
MNRPF [Member]
USD ($)
Dec. 31, 2012
MNRPF [Member]
GBP (£)
Dec. 31, 2010
MNRPF [Member]
USD ($)
Dec. 31, 2010
MNRPF [Member]
GBP (£)
Dec. 31, 2013
AMOPP [Member]
USD ($)
Dec. 31, 2012
AMOPP [Member]
USD ($)
Dec. 31, 2011
AMOPP [Member]
USD ($)
Dec. 31, 2013
SPP [Member]
USD ($)
Dec. 31, 2012
SPP [Member]
USD ($)
Dec. 31, 2011
SPP [Member]
USD ($)
Dec. 31, 2013
Defined Contribution Pension [Member]
USD ($)
Dec. 31, 2012
Defined Contribution Pension [Member]
USD ($)
Dec. 31, 2011
Defined Contribution Pension [Member]
USD ($)
Dec. 31, 2013
Deferred Bonus [Member]
SEACOR Deferred Compensation Plan [Member]
Dec. 31, 2013
Restricted Stock [Member]
SEACOR Deferred Compensation Plan [Member]
Defined Benefit Plan Disclosure [Line Items]                                                  
Maximum plan contribution as a percentage of total contribution 50.00%     75.00%                                       100.00% 100.00%
Maximum Employee Contribution Rate Attracting and Employer Match 6.00%                                                
Savings plan costs $ 2.2 $ 3.3 $ 3.1                                            
Deferred compensation obligation       0.6 0.5                                        
Pension and other postretirement benefit expense           2.7 16.7 0.4                         0.5 0.4 0.3    
Pension and other postretirement benefit plans, total funding deficit                 359.3 217.0     281.0 175.0                      
Pension and Other Postretirement Benefit Plans, Allocated Share of Funding Deficit                     0.3 0.2 1.0 0.6                      
Pension and Other Postretirement Benefit Contributions                             0.9 0.9 0.9 1.5 1.3 0.6          
Pension and other postretirement benefit plans, withdrawal liability                             $ 45.6