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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

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