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Long-term debt - Effects of Interest Rate Swap and Cap Agreements (Detail) - Cash Flow Hedging - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of unrealized losses in OCI on interest rate cap agreements | $ (1,628) | $ (1,060) | $ (16,470) | $ (1,672)
Reclassification from accumulated other comprehensive loss into net income | 1,034 | 1,569 | 4,280 | 4,782
Related income tax |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of unrealized losses in OCI on interest rate cap agreements | 541 | 360 | 5,476 | 572
Reclassification from accumulated other comprehensive loss into net income | (344) | (532) | (1,424) | (1,646)
Interest rate cap agreements | Debt Expense |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of unrealized losses in OCI on interest rate cap agreements | (2,169) | (1,420) | (21,946) | (2,244)
Reclassification from accumulated other comprehensive loss into net income | $ 1,378 | $ 2,101 | $ 5,704 | $ 6,428

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