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Summary of Debt Outstanding (Detail) - USD ($)
$ in Thousands

Sep. 30, 2018

Dec. 31, 2017

Debt [Line Items]

Amount outstanding

^[1]

$ 435,018

$ 438,827

Debt premiums and discounts, net

7,954

9,333

Less: Current portion of long-term debt

(7,671)

(5,103)

Total long-term debt

435,301

443,057

8.00% 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]

13,593

14,054

Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS

Debt [Line Items]

Amount outstanding

^[1]

24,545

25,965

United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS

Debt [Line Items]

Amount outstanding

^[1]

22,116

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 September 30, 2018 and December 31, 2017, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $85.0 million and $88.5 million, respectively. The weighted average interest rate of the Troms Offshore borrowings as of September 30, 2018, was 5.01%.
[2]	As of September 30, 2018 and December 31, 2017, the fair value (Level 2) of the Secured Notes was $369.2 million and $359.8 million, respectively.

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