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Summary Debt Outstanding Based On Stated Maturities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | ---
Debt [Line Items] |  |
Amount outstanding | $ 448,160 |
Less: Current portion of long-term debt | 5,103 |
Total long-term debt | 443,057 |
Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | $ 2,040,525
Less: Deferred debt issue costs |  | 6,401
Less: Current portion of long-term debt |  | 2,034,124
Bank Term Loan Due July 2019 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 300,000
Revolving Line Of Credit Due July 2019 | Predecessor | Revolving Credit Facility |  |
Debt [Line Items] |  |
Outstanding borrowing |  | 600,000
3.90% September 2010 Senior Notes Due December 2017 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 44,500
3.95% September 2010 Senior Notes Due December 2017 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 25,000
4.12% September 2010 Senior Notes Due December 2018 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 25,000
4.17% September 2010 Senior Notes Due December 2018 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 25,000
4.33% September 2010 Senior Notes Due December 2019 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 50,000
4.51% September 2010 Senior Notes Due December 2020 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 100,000
4.56% September 2010 Senior Notes Due December 2020 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 65,000
4.61% September 2010 Senior Notes Due December 2022 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 48,000
4.06% August 2011 Senior Notes Due March 2019 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 50,000
4.54% August 2011 Senior Notes Due June 2021 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 65,000
4.64% August 2011 Senior Notes Due June 2021 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 50,000
4.26% September 2013 Senior Notes Due November 2020 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 123,000
5.01% September 2013 Senior Notes Due November 2023 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 250,000
5.16% September 2013 Senior Notes Due November 2025 | Predecessor |  |
Debt [Line Items] |  |
Amount outstanding |  | 127,000
8.00% New Secured Notes Due August 2022 |  |
Debt [Line Items] |  |
New secured notes | 350,000 |
New Secured Notes |  |
Debt [Line Items] |  |
Premium | 14,329 |
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS |  |
Debt [Line Items] |  |
Amount outstanding | 14,054 |
Premium | 115 |
Norwegian Kroner Denominated Notes Due May 2024 | Predecessor | Troms Offshore Supply AS |  |
Debt [Line Items] |  |
Amount outstanding |  | 14,864
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS |  |
Debt [Line Items] |  |
Amount outstanding | 25,965 |
Discount | (1,586) |
Norwegian Kroner Denominated Notes Due January 2026 | Predecessor | Troms Offshore Supply AS |  |
Debt [Line Items] |  |
Amount outstanding |  | 26,167
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS |  |
Debt [Line Items] |  |
Amount outstanding | 23,345 |
Discount | (1,678) |
United States Dollar Denominated Notes Due January 2027 | Predecessor | Troms Offshore Supply AS |  |
Debt [Line Items] |  |
Amount outstanding |  | 24,573
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS |  |
Debt [Line Items] |  |
Amount outstanding | 25,463 |
Discount | $ (1,847) |
United States Dollar Denominated Notes Due April 2027 | Predecessor | Troms Offshore Supply AS |  |
Debt [Line Items] |  |
Amount outstanding |  | $ 27,421

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