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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of unrecognized gains (losses) in OCI on interest rate cap agreements | $ 37 | $ (478) | $ 819 | $ (5,479)
Amount of losses reclassified from accumulated OCI into income | 1,606 | 1,265 | 4,680 | 3,793
Tax benefit (expense) |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of unrecognized gains (losses) in OCI on interest rate cap agreements | (13) | 304 | (284) | 3,488
Amount of losses reclassified from accumulated OCI into income | (557) | (805) | (1,623) | (2,415)
Interest rate cap agreements | Debt Expense (Including Refinancing Charges) |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of unrecognized gains (losses) in OCI on interest rate cap agreements | 50 | (782) | 1,103 | (8,967)
Amount of losses reclassified from accumulated OCI into income | $ 2,163 | $ 2,070 | $ 6,303 | $ 6,208

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