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Summary of Debt Outstanding (Detail) - USD ($)
$ in Thousands

Jun. 30, 2017

Mar. 31, 2017

Debt [Line Items]

Amount outstanding

$ 2,039,437

$ 2,040,525

Less: Deferred debt issue costs

968

6,401

Less: Current portion of long-term debt

10,106

2,034,124

Less: Liabilities subject to compromise

1,947,500

Total long-term debt

80,863

Term Loan Facility

Debt [Line Items]

Amount outstanding

^[1]

300,000

300,000

September 2013 Senior Unsecured Notes

Debt [Line Items]

Aggregate debt outstanding

^[1]

500,000

500,000

August 2011 Senior Unsecured Notes

Debt [Line Items]

Aggregate debt outstanding

^[1]

165,000

165,000

September 2010 Senior Unsecured Notes

Debt [Line Items]

Aggregate debt outstanding

^[1]

382,500

382,500

Revolving Credit Facility

Debt [Line Items]

Outstanding borrowing

^[1],[2]

600,000

600,000

Troms Offshore borrowings | May 2015 4.42% Notes

Debt [Line Items]

Amount outstanding

^[3]

26,116

27,421

Troms Offshore borrowings | March 2015 4.41% Notes

Debt [Line Items]

Amount outstanding

^[3]

24,573

24,573

Troms Offshore borrowings | January 2014 4.31% notes

Debt [Line Items]

Amount outstanding

^[3],[4]

26,957

26,167

Troms Offshore borrowings | May 2012 5.88% notes

Debt [Line Items]

Amount outstanding

^[3],[4]

$ 14,291

$ 14,864

[1]	At June 30, 2017, the term loan, revolving line of credit and senior notes have been classified as liabilities subject to compromise as a result of the bankruptcy petition filed on May 17, 2017. Refer to Note (3) - Liabilities Subject to Compromise for additional information. As of June 30, 2017 and March 31, 2017, the aggregate fair value (Level 2) of the term loan, revolver and senior notes were $1.1 billion and $1.1 billion, respectively.
[2]	The revolver was fully utilized at June 30, 2017 and March 31, 2017, respectively.
[3]	The company continues to make semi-annual principal and interest payments on these notes in the ordinary course of business. As of June 30, 2017 and March 31, 2017, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $91.7 million and $92.9 million, respectively.
[4]	Notes are denominated in Norwegian kroner (NOK)

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