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Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Jun. 30, 2018
Dec. 31, 2017
Debt [Line Items]      
Amount outstanding   $ 436,403 $ 438,827
Predecessor      
Debt [Line Items]      
Aggregate debt outstanding $ 500,000    
Weighted average remaining life in years 6 years 4 months 24 days    
Weighted average coupon rate on notes outstanding 4.86%    
Fair value of debt outstanding $ 280,000    
September 2010 Senior Unsecured Notes | Predecessor      
Debt [Line Items]      
Aggregate debt outstanding $ 382,500    
Weighted average remaining life in years 3 years 1 month 6 days    
Weighted average coupon rate on notes outstanding 4.35%    
Fair value of debt outstanding $ 214,200    
August 2011 Senior Unsecured Notes | Predecessor      
Debt [Line Items]      
Aggregate debt outstanding $ 165,000    
Weighted average remaining life in years 3 years 7 months 6 days    
Weighted average coupon rate on notes outstanding 4.42%    
Fair value of debt outstanding $ 92,400    
Troms Offshore Supply AS      
Debt [Line Items]      
Weighted average coupon rate on notes outstanding   5.00%  
Troms Offshore Supply AS | May 2015 notes      
Debt [Line Items]      
Amount outstanding     25,463
Fair value of debt outstanding     25,427
Troms Offshore Supply AS | May 2015 notes | Predecessor      
Debt [Line Items]      
Amount outstanding 27,421    
Fair value of debt outstanding 27,395    
Troms Offshore Supply AS | March 2015 notes      
Debt [Line Items]      
Amount outstanding     23,345
Fair value of debt outstanding     $ 23,251
Troms Offshore Supply AS | March 2015 notes | Predecessor      
Debt [Line Items]      
Amount outstanding 24,573    
Fair value of debt outstanding $ 24,544