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Summary of Debt Outstanding (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
Debt [Line Items]    
Amount outstanding including debt premium and discounts, net $ 448,160  
Amount outstanding 438,827  
Debt premiums and discounts, net 9,333  
Less: Current portion of long-term debt 5,103  
Total long-term debt 443,057  
8.00% New Secured Notes Due August 2022    
Debt [Line Items]    
New secured notes 350,000  
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 January 2026 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding 25,965  
Discount (1,586)  
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 April 2027 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding 25,463  
Discount (1,847)  
New Secured Notes [Member]    
Debt [Line Items]    
Premium $ 14,329  
Predecessor    
Debt [Line Items]    
Amount outstanding including debt premium and discounts, net   $ 2,040,525
Less: Deferred debt issue costs   6,401
Less: Current portion of long-term debt   2,034,124
Predecessor | Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding   14,864
Predecessor | Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding   26,167
Predecessor | United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding   24,573
Predecessor | United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS    
Debt [Line Items]    
Amount outstanding   27,421
Predecessor | Bank Term Loan Due July Two Thousand Nineteen [Member]    
Debt [Line Items]    
Amount outstanding   300,000
Predecessor | Three Point Nine Zero Percent September Two Thousand Ten Senior Notes Due December Two Thousand Seventeen [Member]    
Debt [Line Items]    
Amount outstanding   44,500
Predecessor | Three Point Nine Five Percent September Two Thousand Ten Senior Notes Due December Two Thousand Seventeen [Member]    
Debt [Line Items]    
Amount outstanding   25,000
Predecessor | Four Point One Two Percent September Two Thousand Ten Senior Notes Due December Two Thousand Eighteen [Member]    
Debt [Line Items]    
Amount outstanding   25,000
Predecessor | Four Point One Seven Percent September Two Thousand Ten Senior Notes Due December Two Thousand Eighteen [Member]    
Debt [Line Items]    
Amount outstanding   25,000
Predecessor | Four Point Three Three Percent September Two Thousand Ten Senior Notes Due December Two Thousand Nineteen [Member]    
Debt [Line Items]    
Amount outstanding   50,000
Predecessor | Four Point Five One Percent September Two Thousand Ten Senior Notes Due December Two Thousand Twenty [Member]    
Debt [Line Items]    
Amount outstanding   100,000
Predecessor | Four Point Five Six Percent September Two Thousand Ten Senior Notes Due December Two Thousand Twenty [Member]    
Debt [Line Items]    
Amount outstanding   65,000
Predecessor | Four Point Six One Percent September Two Thousand Ten Senior Notes Due December Two Thousand Twenty Two [Member]    
Debt [Line Items]    
Amount outstanding   48,000
Predecessor | Four Point Zero Six Percent August Two Thousand Eleven Senior Notes Due March Two Thousand Nineteen [Member]    
Debt [Line Items]    
Amount outstanding   50,000
Predecessor | Four Point Five Four Percent August Two Thousand Eleven Senior Notes Due June Two Thousand Twenty One [Member]    
Debt [Line Items]    
Amount outstanding   65,000
Predecessor | Four Point Six Four Percent August Two Thousand Eleven Senior Notes Due June Two Thousand Twenty One [Member]    
Debt [Line Items]    
Amount outstanding   50,000
Predecessor | Four Point Two Six Percent September Two Thousand Thirteen Senior Notes Due November Two Thousand Twenty [Member]    
Debt [Line Items]    
Amount outstanding   123,000
Predecessor | Five Point Zero One Percent September Two Thousand Thirteen Senior Notes Due November Two Thousand Twenty Three [Member]    
Debt [Line Items]    
Amount outstanding   250,000
Predecessor | Five Point One Six Percent September Two Thousand Thirteen Senior Notes Due November Two Thousand Twenty Five [Member]    
Debt [Line Items]    
Amount outstanding   127,000
Predecessor | Revolving Credit Facility | Revolving Line Of Credit Due July 2019    
Debt [Line Items]    
Outstanding borrowing   $ 600,000