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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Vessel
T
Nov. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2015
Vessel
T
hp
Jun. 30, 2015
Vessel
T
hp
May 31, 2015
USD ($)
Vessel
T
Dec. 31, 2016
USD ($)
Vessel
T
Mar. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Vessel
T
Dec. 31, 2015
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Significant Purchase and Supply Commitment [Line Items]                            
Refunds from cancelled vessel construction contracts                     $ 25,565 $ 36,190    
Fast, Crew/Supply Boat                            
Significant Purchase and Supply Commitment [Line Items]                            
Number of vessels under construction | Vessel                     1      
Impairment charge on amounts not recoverable                     $ 2,400      
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      
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     5,600      
Vessel Commitments                            
Significant Purchase and Supply Commitment [Line Items]                            
Remaining Balance, commitments   $ 46,655           $ 46,655     $ 46,655      
Number of Vessels, commitments | Vessel   3           3     3      
Deepwater PSVs                            
Significant Purchase and Supply Commitment [Line Items]                            
Significant commitment, new construction deadweight tons capacity | T   5,400         3,800 5,400     5,400      
Number of vessels under construction | Vessel             2       3 [1]      
Shipyard returned to the company   $ 200 $ 14,000 $ 11,500                    
Refunds from cancelled vessel construction contracts                     $ 19,100      
Impairment charge on amounts not recoverable                 $ 1,900          
Aggregate installment payment   117,624 [1]         $ 5,400 $ 117,624 [1]     117,624 [1]      
Obligation to be relieved             21,700              
Aggregate installment payment payment with interest             $ 11,900              
Shipyard owed amount       11,700                    
Foreign taxes on interest       $ 200                    
Remaining installment obligation held   $ 50                 $ 250      
Extended option period for vessels                     Jun. 30, 2017      
Vessels Under Construction                            
Significant Purchase and Supply Commitment [Line Items]                            
Significant commitment, new construction deadweight tons capacity | T         4,700 4,700                
Number of vessels under construction | Vessel         6 6                
Significant commitment, new construction brake horsepower | hp         7,145 7,145                
Deferred final installment of vessel construction contracts $ 5,100                          
Refunds from cancelled vessel construction contracts                           $ 36,000
Obligation to pay additional amount due to termination                           50,000
Accrued interest owing on the returned installments $ 3,500               $ 3,500 $ 3,500       $ 3,500
Impairment charge on amounts not recoverable                   $ 800        
Gain recognized on final refunds received from shipyard               $ 800            
Vessels Under Construction | Scenario Forecast                            
Significant Purchase and Supply Commitment [Line Items]                            
Refunds from cancelled vessel construction contracts                         $ 26,000  
Obligation to pay additional amount due to termination                         35,000  
Accrued interest owing on the returned installments                         $ 3,800  
Minimum | Deepwater PSVs                            
Significant Purchase and Supply Commitment [Line Items]                            
Significant commitment, new construction final delivery date                     2017-02      
Maximum | Deepwater PSVs                            
Significant Purchase and Supply Commitment [Line Items]                            
Significant commitment, new construction final delivery date                     2017-06      
[1] two remaining option vessels and a fast supply boat are not included in the table above.