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Schedule of Vessel Commitments (Detail) - Jun. 30, 2015
$ in Thousands
USD ($)
Vessel
Significant Purchase and Supply Commitment [Line Items]  
Number of Vessels, commitments | Vessel 16
Vessel Commitments  
Significant Purchase and Supply Commitment [Line Items]  
Number of Vessels, commitments | Vessel 16
Total cost, commitments $ 490,125
Invested, commitments 266,824
Remaining Balance, commitments $ 223,301
Deepwater PSVs  
Significant Purchase and Supply Commitment [Line Items]  
Number of vessels under construction | Vessel 13
Total cost, under construction $ 439,109
Invested, under construction 227,291
Remaining Balance, under construction $ 211,818
Towing Supply Vessels  
Significant Purchase and Supply Commitment [Line Items]  
Number of vessels under construction | Vessel 3
Total cost, under construction $ 51,016
Invested, under construction 39,533
Remaining Balance, under construction $ 11,483