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Schedule of Vessel Commitments (Detail)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
USD ($)
Vessel
Significant Purchase and Supply Commitment [Line Items]  
Number of Vessels, commitments | Vessel 2
Vessel Commitments  
Significant Purchase and Supply Commitment [Line Items]  
Number of Vessels, commitments | Vessel 2
Total cost, commitments $ 110,022
Invested, commitments 77,054
Remaining Balance, commitments $ 32,968
Deepwater PSVs  
Significant Purchase and Supply Commitment [Line Items]  
Number of Vessels, commitments | Vessel 2
Remaining Balance, commitments $ 33,000
Number of vessels under construction | Vessel 2 [1],[2]
Total cost, under construction $ 110,022 [1],[2]
Invested, under construction 77,054 [1],[2]
Remaining Balance, under construction $ 32,968 [1],[2]
[1] In April 2017, the company entered into a novation agreement and assigned the construction contract related to one of the vessels under construction to a third party for net consideration of $5.3 million thus relieving the company of future payments of $27.2 million.
[2] The two remaining option vessels, a vessel rejected at the time of delivery, and a fast supply boat are not included in the table above.