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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) Vessel T | Mar. 31, 2017 USD ($) Vessel T
Significant Purchase and Supply Commitment [Line Items] |  |  |  |
Cash compensation on termination of employment, maximum |  |  |  | $ 46,300
Number of Vessels, commitments | Vessel |  |  | 2 | 2
Accumulated costs of rejected vessel | [1] |  | $ 48,382 | $ 48,382
Fast, Crew/Supply Boat |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |
Number of vessels under construction | Vessel |  |  |  | 1
Insurance coverage for the progress payments made on the vessel by the third party credit support |  |  |  | 90.00%
Insurance coverage by the third party credit support for the carrying value of the accumulated costs |  |  |  | $ 2,400
Impairment charge on amounts not recoverable |  |  |  | 2,400
Fast, Crew/Supply Boat | Reclassification of Construction in Progress to Other Non-Current Assets |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |
Committed and invested amount, remaining |  |  | $ 5,600 | $ 5,600
Deepwater PSVs |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |
Number of Vessels, commitments | Vessel |  |  | 2 | 2
Remaining Balance, commitments |  |  | $ 33,000 | $ 33,000
Significant commitment, new construction final delivery date |  |  |  | 2017-09
Final contractual milestone payment withheld |  |  | 4,500 |
Refund amount demanded to shipyard |  |  | 43,000 |
Accumulated costs of rejected vessel |  |  | $ 48,400 | $ 48,400
Number of vessels under construction | Vessel | [2],[3] |  |  | 2
Novation Agreement |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |
Impairment charges related to construction of vessel |  |  |  | $ 23,900
Novation Agreement | Subsequent Event |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |
Significant commitment net of amount no longer due |  | $ 5,800 |  |
Consideration received from third party |  | 5,200 |  |
Obligation to be relieved |  | $ 27,200 |  |
Minimum | Deepwater PSVs |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |
Significant commitment, new construction deadweight tons capacity | T |  |  | 5,150 | 5,150
Maximum | Deepwater PSVs |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |
Significant commitment, new construction deadweight tons capacity | T |  |  | 5,900 | 5,900
[1] | Refer to Note (12) of Notes to Consolidated Financial Statements included in Item 8 of this Annual Report on Form 10-K for additional information regarding the vessel rejected at the time of delivery.
[2] | 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.
[3] | 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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