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Derivative Instruments and Hedging Activities - Effect of Gains (Losses) on Cross Currency Swaps (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized and unrealized (losses) gains on non-designated derivative instruments (note 10) | $ (3,389) | $ (9,270) | $ 3,932 | $ (30,933)
Cross Currency Interest Rate Contract Maturity And Partial Termination |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized losses | 0 | (33,844) | 0 | (33,844)
Cross Currency Interest Rate Contract [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized losses | (1,293) | (1,430) | (2,638) | (3,247)
Unrealized (losses) gains | (2,261) | 45,882 | 2,869 | (3,658)
Realized and unrealized (losses) gains on non-designated derivative instruments (note 10) | $ (3,554) | $ 10,608 | $ 231 | $ (40,749)

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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=125515794&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=125515794&loc=SL5624171-113959 + Details
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