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Summary of Debt Outstanding (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt [Line Items]    
Amount outstanding [1] $ 439,118 $ 438,827
Debt premiums and discounts, net 8,826 9,333
Less: Current portion of long-term debt 5,215 5,103
Total long-term debt 442,729 443,057
8.00% New Secured Notes Due August 2022    
Debt [Line Items]    
Secured notes [2] 349,954 350,000
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding [1] 14,669 14,054
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding [1] 26,303 25,965
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding [1] 22,729 23,345
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding [1] $ 25,463 $ 25,463
[1] The company pays principal and interest on these notes semi-annually. As of March 31, 2018 and December 31, 2017, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $89.2 million and $88.5 million, respectively. The weighted average interest rate of the Troms Offshore borrowings as of March 31, 2018 was 5.01%.
[2] As of March 31, 2018 and December 31, 2017 the fair value (Level 2) of the New Secured Notes was $358.7 million and $359.8 million, respectively.