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v3.20.1

Summary of Debt Outstanding (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Restricted cash | $ 12,461 | $ 5,755
Percentage of net proceeds from asset dispositions | 65.00% |
Troms Offshore Supply AS |  |
Debt Instrument [Line Items] |  |
Description of frequency of periodic payments on notes | semi-annually |
Weighted average interest rate of debt borrowings | 5.00% |
Troms Offshore Supply AS | Level 2 |  |
Debt Instrument [Line Items] |  |
Fair value of debt outstanding | $ 65,400 | $ 72,900
8.00% Senior Secured Notes Due August 2022 |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 8.00% | 8.00%
Debt Instrument Maturity Period | August 2022 | August 2022
8.00% Senior Secured Notes Due August 2022 | Level 2 |  |
Debt Instrument [Line Items] |  |
Fair value of debt outstanding | $ 220,900 | $ 237,600
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS |  |
Debt Instrument [Line Items] |  |
Debt Instrument Maturity Period | May 2024 | May 2024
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS |  |
Debt Instrument [Line Items] |  |
Debt Instrument Maturity Period | January 2026 | January 2026
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS |  |
Debt Instrument [Line Items] |  |
Debt Instrument Maturity Period | January 2027 | January 2027
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS |  |
Debt Instrument [Line Items] |  |
Debt Instrument Maturity Period | April 2027 | April 2027

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