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Schedule of Vessel Commitments (Detail)
$ in Thousands
1 Months Ended 9 Months Ended
May 31, 2015
USD ($)
Vessel
Dec. 31, 2016
USD ($)
Vessel
Vessel Commitments    
Significant Purchase and Supply Commitment [Line Items]    
Number of Vessels, commitments | Vessel   3
Total cost, commitments   $ 164,279
Invested, commitments   117,624
Remaining Balance, commitments   $ 46,655
Deepwater PSVs    
Significant Purchase and Supply Commitment [Line Items]    
Number of vessels under construction | Vessel 2 3 [1]
Total cost, under construction [1]   $ 164,279
Invested, under construction $ 5,400 117,624 [1]
Remaining Balance, under construction [1]   $ 46,655
[1] two remaining option vessels and a fast supply boat are not included in the table above.