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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
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total realized and unrealized gains (losses) on derivative instruments | $ (9,270) | $ (10,964) | $ (30,933) | $ (16,387)
Cross Currency Interest Rate Contract Maturity And Partial Termination |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized losses | (33,844) | 0 | (33,844) | 0
Cross Currency Interest Rate Contract [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized losses | (1,430) | (1,087) | (3,247) | (2,521)
Unrealized gains (losses) | 45,882 | (140) | (3,658) | (2,060)
Total realized and unrealized gains (losses) on derivative instruments | $ 10,608 | $ (1,227) | $ (40,749) | $ (4,581)

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