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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of unrealized losses in OCI on interest rate cap agreements | $ (1,824) | $ (31) | $ (14,842) | $ (611)
Reclassification from accumulated other comprehensive loss into net income | 1,623 | 1,606 | 3,246 | 3,212
Related income tax |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of unrealized losses in OCI on interest rate cap agreements | 607 | 11 | 4,935 | 212
Reclassification from accumulated other comprehensive loss into net income | (540) | (557) | (1,080) | (1,114)
Interest rate cap agreements | Debt Expense |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of unrealized losses in OCI on interest rate cap agreements | (2,431) | (42) | (19,777) | (823)
Reclassification from accumulated other comprehensive loss into net income | $ 2,163 | $ 2,163 | $ 4,326 | $ 4,326

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