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Summary of Debt Outstanding (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt [Line Items] |  |  |
Amount outstanding | [1] | $ 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] |  |  |
Secured notes | [2] | 349,954 | 350,000
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [1] | 13,595 | 14,054
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [1] | 25,315 | 25,965
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [1] | 22,729 | 23,345
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [1] | $ 24,810 | $ 25,463
[1] | The company pays principal and interest on these notes semi-annually. As of June 30, 2018 and December 31, 2017, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $86.4 million and $88.5 million, respectively. The weighted average interest rate of the Troms Offshore borrowings as of June 30, 2018, was 5.00%.
[2] | As of June 30, 2018 and December 31, 2017, the fair value (Level 2) of the New Secured Notes was $361.5 million and $359.8 million, respectively.

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