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Schedule of Vessel Commitments (Parenthetical) (Detail)
$ in Millions
 1 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Vessel
Mar. 31, 2016
USD ($)
Vessel
Significant Purchase and Supply Commitment [Line Items]    
Number of vessels under construction 9  
Refunds from cancelled vessel construction contracts | $ $ 31 $ 31
Option Agreement    
Significant Purchase and Supply Commitment [Line Items]    
Number of vessels under construction   6