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

Mar. 31, 2020

Dec. 31, 2019

Debt Instrument [Line Items]

Amount outstanding

^[1]

$ 290,168

$ 297,659

Debt premiums and discounts, net

(8,049)

(8,725)

Less: Current portion of long-term debt

(9,104)

(9,890)

Total long-term debt

273,015

279,044

8.00% Senior Secured Notes Due August 2022

Debt Instrument [Line Items]

Secured notes

^[2],[3]

224,793

224,793

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

Debt Instrument [Line Items]

Amount outstanding

^[1]

8,587

10,260

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

Debt Instrument [Line Items]

Amount outstanding

^[1]

16,199

20,788

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

Debt Instrument [Line Items]

Amount outstanding

^[1]

19,044

20,273

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

Debt Instrument [Line Items]

Amount outstanding

^[1]

$ 21,545

$ 21,545

[1]	We pay principal and interest on these notes semi-annually.  As of March 31, 2020 and December 31, 2019, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $65.4 million and $72.9 million, respectively. The weighted average interest rate of the Troms Offshore borrowings as of March 31, 2020 was 5.0%.
[2]	As of March 31, 2020 and December 31, 2019 the fair value (Level 2) of the Secured Notes was $220.9 million and $237.6 million, respectively.
[3]	The $12.5 million restricted cash on the balance sheet at March 31, 2020, represents approximately 65% of net proceeds from asset dispositions since the date of the last tender offer and is restricted by the terms of the Indenture.

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