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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.