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Schedule of Vessel Commitments (Detail)
$ in Thousands
1 Months Ended 9 Months Ended
May. 31, 2015
USD ($)
Vessel
Dec. 31, 2015
USD ($)
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],[2]   9  
Total cost, commitments [1],[2]   $ 352,026  
Invested, commitments [1],[2]   244,836  
Remaining Balance, commitments [1],[2]   $ 107,190  
Deepwater PSVs      
Significant Purchase and Supply Commitment [Line Items]      
Number of vessels under construction | Vessel 2 8 [1]  
Total cost, under construction [1]   $ 335,746  
Invested, under construction $ 5,400 231,256 [1] $ 1,000
Remaining Balance, under construction [1]   $ 104,490  
Towing Supply Vessels      
Significant Purchase and Supply Commitment [Line Items]      
Number of vessels under construction | Vessel [1]   1  
Total cost, under construction [1]   $ 16,280  
Invested, under construction [1]   13,580  
Remaining Balance, under construction [1]   $ 2,700  
[1] Six additional option vessels and a fast supply boat are not included in the table above.
[2] The company is entitled to receive a refund of prior shipyard payments totaling approximately $43 million (of which $12 million was received in January 2016) which would offset the remaining balance of vessel commitments. See further discussion below.