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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

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