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

Sep. 30, 2019

Dec. 31, 2018

Debt [Line Items]

Amount outstanding

^[1]

$ 423,602

$ 431,456

Debt premiums and discounts, net

5,992

7,548

Less: Current portion of long-term debt

(9,689)

(8,568)

Total long-term debt

419,905

430,436

8.00% Senior Secured Notes Due August 2022

Debt [Line Items]

Secured notes

^[2],[3]

349,793

349,954

Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS

Debt [Line Items]

Amount outstanding

^[1]

10,751

12,241

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

Debt [Line Items]

Amount outstanding

^[1]

19,934

22,988

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

Debt [Line Items]

Amount outstanding

^[1]

20,273

22,116

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

Debt [Line Items]

Amount outstanding

^[1]

$ 22,851

$ 24,157

[1]	We pay principal and interest on these notes semi-annually.  As of September 30, 2019 and December 31, 2018, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $73.7 million and $81.5  million, respectively. The weighted average interest rate of the Troms Offshore borrowings as of September 30, 2019 was 5.0%.
[2]	In January 2019 and July 2019, we repurchased $160,000 and $747, respectively, of the Secured Notes in accordance with a tender offer obligation under our Indenture. The $3.3 million restricted cash on the balance sheet at September 30, 2019, represents proceeds from asset sales since the date of the July 2019 tender offer and is restricted as of that date by the terms of the Indenture.
[3]	As of September 30, 2019 and December 31, 2018 the fair value (Level 2) of the Secured Notes was $357.9 million and $359.4 million, respectively.

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