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Schedule of Vessel Commitments (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 Vessel | Apr. 30, 2015 Vessel | Jun. 30, 2016 USD ($) Vessel | May 31, 2015 USD ($)
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |
Number of vessels under construction | Vessel |  | 9 |  |  |  |
Vessel Commitments |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |
Number of Vessels, commitments | Vessel | [1] |  |  | 4 |  |
Total cost, commitments | [1] |  |  | $ 181,615 |  |
Invested, commitments | [1] |  |  | 123,696 |  |
Remaining Balance, commitments | [1] |  |  | $ 57,919 |  |
Deepwater PSVs |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |
Number of vessels under construction | Vessel |  | 6 | 2 | 4 | [2] |
Total cost, under construction | [2] |  |  | $ 181,615 |  |
Invested, under construction |  |  |  | 123,696 | [2] | $ 5,400
Remaining Balance, under construction | [2] |  |  | $ 57,919 |  |
[1] | The company is entitled to receive a refund of prior shipyard payments totaling approximately $17 million which would reduce the remaining balance of vessel commitments. See further discussion below.
[2] | Six additional option vessels and a fast supply boat are not included in the table above.

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