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Summary of Debt Outstanding Based On Stated Maturities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt [Line Items]    
Amount outstanding $ 431,456 $ 438,827
Debt premium and discount, net 7,548 9,333
Less: Current portion of long-term debt (8,568) (5,103)
Total long-term debt 430,436 443,057
8.00% Secured Notes Due August 2022    
Debt [Line Items]    
Secured notes 349,954 350,000
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding 12,241 14,054
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding 22,988 25,965
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding 22,116 23,345
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding $ 24,157 $ 25,463