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Schedule of Vessel Commitments (Detail) $ in Thousands | 12 Months Ended
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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.

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