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Summary of Debt Outstanding (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Restricted cash	$ 12,461	$ 5,755
Percentage of net proceeds from asset dispositions	65.00%
Troms Offshore Supply AS
Debt Instrument [Line Items]
Description of frequency of periodic payments on notes	semi-annually
Weighted average interest rate of debt borrowings	5.00%
Troms Offshore Supply AS | Level 2
Debt Instrument [Line Items]
Fair value of debt outstanding	$ 65,400	$ 72,900
8.00% Senior Secured Notes Due August 2022
Debt Instrument [Line Items]
Debt instrument interest rate	8.00%	8.00%
Debt Instrument Maturity Period	August 2022	August 2022
8.00% Senior Secured Notes Due August 2022 | Level 2
Debt Instrument [Line Items]
Fair value of debt outstanding	$ 220,900	$ 237,600
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS
Debt Instrument [Line Items]
Debt Instrument Maturity Period	May 2024	May 2024
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS
Debt Instrument [Line Items]
Debt Instrument Maturity Period	January 2026	January 2026
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS
Debt Instrument [Line Items]
Debt Instrument Maturity Period	January 2027	January 2027
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS
Debt Instrument [Line Items]
Debt Instrument Maturity Period	April 2027	April 2027

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Percentage of net proceeds from asset dispositions.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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-Topic 230
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