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Derivative Instruments and Hedging Activities - Commitment of Cross Currency Swaps (Detail) - Cross Currency Interest Rate Contract [Member] kr in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 NOK (kr)
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (44,773)
NIBOR | Six Point Zero Margin [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 146,500	kr 1,200,000
Receivable Margin	6.00%	6.00%
Derivative, Fixed Interest Rate	7.72%	7.72%
Fair Value / Carrying Amount of Asset / (Liability)	$ (20,638)
Remaining Term (years)	1 year 1 month 6 days
NIBOR | Five Point One Five Margin
Derivative [Line Items]
Derivative, Notional Amount	$ 112,000	kr 1,000,000
Receivable Margin	5.15%	5.15%
Derivative, Fixed Interest Rate	5.74%	5.74%
Fair Value / Carrying Amount of Asset / (Liability)	$ (5,529)
Remaining Term (years)	4 years 10 months 24 days
NIBOR | 4.60%
Derivative [Line Items]
Derivative, Notional Amount	$ 102,000	kr 850,000
Receivable Margin	4.60%	4.60%
Derivative, Fixed Interest Rate	7.89%	7.89%
Fair Value / Carrying Amount of Asset / (Liability)	$ (18,606)
Remaining Term (years)	2 years 10 months 24 days

X

- Definition

Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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- Definition

Fair value as of the balance sheet date of all foreign currency derivatives not designated as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

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