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Summary of Debt Outstanding (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2017
Debt [Line Items]      
Amount outstanding including debt premium and discounts, net   $ 448,160  
Amount outstanding $ 436,403 438,827  
Debt premiums and discounts, net 8,446 9,333  
Less: Current portion of long-term debt 6,290 5,103  
Total long-term debt 438,559 443,057  
8.00% New Secured Notes Due August 2022      
Debt [Line Items]      
New secured notes 349,954 350,000  
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS      
Debt [Line Items]      
Amount outstanding 13,595 14,054  
Premium   115  
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS      
Debt [Line Items]      
Amount outstanding 25,315 25,965  
Discount   (1,586)  
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS      
Debt [Line Items]      
Amount outstanding 22,729 23,345  
Discount   (1,678)  
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS      
Debt [Line Items]      
Amount outstanding $ 24,810 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