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v3.19.3.a.u2

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

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