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Schedule of Vessel Commitments (Parenthetical) (Detail)
$ in Millions
 6 Months Ended
Sep. 30, 2016
USD ($)
Vessel
Significant Purchase and Supply Commitment [Line Items]  
Refunds from cancelled vessel construction contracts | $ $ 14.3
Option Agreement  
Significant Purchase and Supply Commitment [Line Items]  
Number of vessels under construction | Vessel 6