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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.