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Summary of Debt Outstanding Based On Stated Maturities (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2018
8.00% Secured Notes Due August 2022  
Debt [Line Items]  
Debt instrument interest rate 8.00%
Debt Instrument Maturity Period August 2022
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS  
Debt [Line Items]  
Debt Instrument Maturity Period May 2024
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS  
Debt [Line Items]  
Debt Instrument Maturity Period January 2026
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS  
Debt [Line Items]  
Debt Instrument Maturity Period January 2027
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS  
Debt [Line Items]  
Debt Instrument Maturity Period April 2027