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Commitments and Contingencies (Details) (USD $)
1 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Marine Segment
Dec. 31, 2012
Marine Segment
Apr. 30, 2012
Property damages and bodily injuries
WFSS Vs Cathay Pacific Airways Limited
item
Jul. 25, 2013
Bankruptcy protection
STX Pan Ocean
Marine Segment
Jul. 25, 2013
Bankruptcy protection
STX Corp
Marine Segment
Legal Matters              
Number of subsidiaries named as defendants         1    
Damages sought         $ 34,000,000    
Outstanding receivables $ 2,587,977,000 $ 2,193,866,000 $ 1,289,119,000 $ 1,069,833,000   $ 12,900,000 $ 9,600,000