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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail) kr in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 NOK (kr) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 NOK (kr)
--- | --- | --- | --- | ---
Debt [Line Items] |  |  |  |
Amount outstanding | $ 431,456 |  | $ 438,827 |
Notes Due May 2024 |  |  |  |
Debt [Line Items] |  |  |  |
Amount outstanding | 12,200 | kr 106,500 |  |
Troms Offshore Supply AS | Notes Due January 2026 |  |  |  |
Debt [Line Items] |  |  |  |
Amount outstanding | 22,988 | 200,000 | 25,965 | kr 212,500
Fair value of debt outstanding | 22,988 |  | 25,850 |
Troms Offshore Supply AS | Notes Due May 2024 |  |  |  |
Debt [Line Items] |  |  |  |
Amount outstanding | 12,241 | kr 106,500 | 14,054 | kr 115,020
Fair value of debt outstanding | $ 12,239 |  | $ 14,013 |

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