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Derivative Instruments and Hedging Activities - Effect of Gains (Losses) on Cross Currency Swaps (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized (losses) gains | $ 10,851 | $ (7,135) | $ (101,157)
Realized and unrealized losses on non-designated derivative instruments (note 16) | (13,719) | (14,852) | (38,854)
Cross Currency Interest Rate Contract Maturity and Partial Termination |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Realized losses | 0 | (42,271) | (25,733)
Cross Currency Interest Rate Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Realized losses | (5,062) | (6,533) | (18,494)
Unrealized (losses) gains | (13,239) | 21,240 | 82,668
Realized and unrealized losses on non-designated derivative instruments (note 16) | $ (18,301) | $ (27,564) | $ 38,441

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