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Schedule of Vessel Commitments (Detail)
$ in Thousands
 1 Months Ended 6 Months Ended
May. 31, 2015
USD ($)
Vessel
Sep. 30, 2015
USD ($)
Vessel
Mar. 31, 2015
USD ($)
Significant Purchase and Supply Commitment [Line Items]      
Number of Vessels, commitments | Vessel   9  
Vessel Commitments      
Significant Purchase and Supply Commitment [Line Items]      
Number of Vessels, commitments | Vessel [1]   9  
Total cost, commitments [1]   $ 338,765  
Invested, commitments [1]   226,611  
Remaining Balance, commitments [1]   $ 112,154  
Deepwater PSVs      
Significant Purchase and Supply Commitment [Line Items]      
Number of vessels under construction | Vessel 2 8 [1]  
Total cost, under construction [1]   $ 322,479  
Invested, under construction $ 5,400 213,280 [1] $ 1,000
Remaining Balance, under construction [1]   $ 109,199  
Towing Supply Vessels      
Significant Purchase and Supply Commitment [Line Items]      
Number of vessels under construction | Vessel [1]   1  
Total cost, under construction [1]   $ 16,286  
Invested, under construction [1]   13,331  
Remaining Balance, under construction [1]   $ 2,955  
[1] Seven vessels under option agreements are not included in the table above.