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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 |

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- 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 No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
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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 No definition available. + Details
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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 + Details
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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 + Details
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