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)

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.

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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
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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 20
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