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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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