Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND ACCOUNTING POLICIES ERA Savings Plan (Details)

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NATURE OF OPERATIONS AND ACCOUNTING POLICIES ERA Savings Plan (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Jan. 02, 2014
Subsequent Event [Member]
Dec. 31, 2012
SEACOR [Member]
Dec. 31, 2011
SEACOR [Member]
Defined Contribution Pension and Other Postretirement Plans [Line Items]        
Employer matching contribution, percent 50.00%      
Employer matching contribution, percent of employees' gross pay 6.00% 3.00%    
Employer contribution $ 1.1   $ 1.0 $ 0.9