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v3.19.1

Summary of Debt Outstanding (Parenthetical) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Jan. 31, 2019
Debt [Line Items] |  |  |
Restricted cash | $ 6,975,000 | $ 25,953,000 |
Troms Offshore Supply AS |  |  |
Debt [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 [Line Items] |  |  |
Fair value of debt outstanding | $ 80,600,000 | $ 81,500,000 |
8.00% Senior Secured Notes Due August 2022 |  |  |
Debt [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 | Offer | Maximum |  |  |
Debt [Line Items] |  |  |
Aggregate principal amount |  | $ 25,400,000 |
8.00% Senior Secured Notes Due August 2022 | Level 2 |  |  |
Debt [Line Items] |  |  |
Fair value of debt outstanding | $ 360,400,000 | $ 359,400,000 |
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Debt Instrument Maturity Period | May 2024 | May 2024 |
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Debt Instrument Maturity Period | January 2026 | January 2026 |
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Debt Instrument Maturity Period | January 2027 | January 2027 |
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Debt Instrument Maturity Period | April 2027 | April 2027 |
Tendered Notes |  |  |
Debt [Line Items] |  |  |
Aggregate principal amount |  |  | $ 160,000

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