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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.