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Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017
Debt [Line Items] |  |
Amount outstanding |  | $ 438,827
Predecessor |  |
Debt [Line Items] |  |
Aggregate debt outstanding | $ 500,000 |
Weighted average remaining life in years | 6 years 4 months 24 days |
Weighted average coupon rate on notes outstanding | 4.86% |
Fair value of debt outstanding | $ 280,000 |
September 2010 Senior Unsecured Notes | Predecessor |  |
Debt [Line Items] |  |
Aggregate debt outstanding | $ 382,500 |
Weighted average remaining life in years | 3 years 1 month 6 days |
Weighted average coupon rate on notes outstanding | 4.35% |
Fair value of debt outstanding | $ 214,200 |
August 2011 Senior Unsecured Notes | Predecessor |  |
Debt [Line Items] |  |
Aggregate debt outstanding | $ 165,000 |
Weighted average remaining life in years | 3 years 7 months 6 days |
Weighted average coupon rate on notes outstanding | 4.42% |
Fair value of debt outstanding | $ 92,400 |
Troms Offshore Supply AS | May 2015 notes |  |
Debt [Line Items] |  |
Amount outstanding |  | 25,463
Fair value of debt outstanding |  | 25,427
Troms Offshore Supply AS | May 2015 notes | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding | 27,421 |
Fair value of debt outstanding | 27,395 |
Troms Offshore Supply AS | March 2015 notes |  |
Debt [Line Items] |  |
Amount outstanding |  | 23,345
Fair value of debt outstanding |  | $ 23,251
Troms Offshore Supply AS | March 2015 notes | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding | 24,573 |
Fair value of debt outstanding | $ 24,544 |

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