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Summary of Debt Outstanding (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Mar. 31, 2017
--- | --- | ---
Debt [Line Items] |  |  |
Amount outstanding |  | $ 450,851 |
Less: Current portion of long-term debt |  | 5,174 |
Total long-term debt |  | 445,677 |
New Secured Notes |  |  |
Debt [Line Items] |  |  |
New secured notes | [1] | 350,000 |
Premium |  | 14,987 |
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
Predecessor | Term Loan Facility |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [1] |  | 300,000
Predecessor | September 2013 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding | [1] |  | 500,000
Predecessor | August 2011 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding | [1] |  | 165,000
Predecessor | September 2010 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding | [1] |  | 382,500
Predecessor | Revolving Credit Facility |  |  |
Debt [Line Items] |  |  |
Outstanding borrowing | [1],[2] |  | 600,000
Troms Offshore borrowings | May 2015 Notes |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [3] | 26,115 |
Discount |  | (1,927) |
Troms Offshore borrowings | March 2015 Notes |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [3] | 23,345 |
Discount |  | (1,755) |
Troms Offshore borrowings | January 2014 notes |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [3] | 26,687 |
Discount |  | (1,707) |
Troms Offshore borrowings | May 2012 notes |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [3] | 14,980 |
Premium |  | $ 126 |
Troms Offshore borrowings | Predecessor | May 2015 Notes |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [3] |  | 27,421
Troms Offshore borrowings | Predecessor | March 2015 Notes |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [3] |  | 24,573
Troms Offshore borrowings | Predecessor | January 2014 notes |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [3] |  | 26,167
Troms Offshore borrowings | Predecessor | May 2012 notes |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [3] |  | $ 14,864
[1] | As of September 30, 2017 the fair value (Level 2) of the New Secured Notes was $357.7 million. As of March 31, 2017 the aggregate fair value (Level 2) of the term loan, revolver and senior notes was $1.1 billion.
[2] | The revolver was fully drawn at March 31, 2017.
[3] | Notes require semi-annual principal and interest payments. As of September 30, 2017 and March 31, 2017, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $90.9 million and $92.9 million, respectively.

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