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Summary of Debt Outstanding Based On Stated Maturities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Amount outstanding $ 297,659 $ 431,456
Debt premium and discount, net (8,725) 7,548
Less: Current portion of long-term debt (9,890) (8,568)
Total long-term debt 279,044 430,436
8.00% Secured Notes Due August 2022    
Debt Instrument [Line Items]    
Secured notes 224,793 349,954
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS    
Debt Instrument [Line Items]    
Amount outstanding 10,260 12,241
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS    
Debt Instrument [Line Items]    
Amount outstanding 20,788 22,988
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS    
Debt Instrument [Line Items]    
Amount outstanding 20,273 22,116
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS    
Debt Instrument [Line Items]    
Amount outstanding $ 21,545 $ 24,157