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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total realized and unrealized (losses) gains on cross-currency swaps | $ 12,529 | $ (17,342) | $ 12,551 | $ (20,246)
Cross Currency Interest Rate Contract Maturity And Partial Termination |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized losses | 0 | (25,733) | 0 | (25,733)
Cross Currency Interest Rate Contract |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized losses | (1,798) | (5,394) | (3,182) | (12,135)
Unrealized (losses) gains | (16,566) | 43,017 | 5,768 | 50,096
Total realized and unrealized (losses) gains on cross-currency swaps | $ (18,364) | $ 11,890 | $ 2,586 | $ 12,228

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