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Derivative Instruments and Hedging Activities - Effect of Gains (Losses) on Cross Currency Swaps (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized and unrealized gains (losses) on derivative instruments | $ (1,471) | $ (1,924) | $ (32,404) | $ (18,311)
Cross Currency Interest Rate Contract Maturity And Partial Termination |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized losses | 0 | 0 | (33,844) | 0
Cross Currency Interest Rate Contract [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized losses | (1,669) | (1,431) | (4,915) | (3,952)
Unrealized gains (losses) | 1,489 | (23,759) | (2,169) | (25,819)
Realized and unrealized gains (losses) on derivative instruments | $ (180) | $ (25,190) | $ (40,928) | $ (29,771)

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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