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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.

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