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Effects of Interest Rate Swap and Cap Agreements (Detail) - Cash Flow Hedging - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements | $ (153) | $ (1,851) | $ (8,238) | $ (10,064)
Amount of losses reclassified from accumulated OCI into income | (388) | (771) | (1,301) | (2,372)
Tax benefit |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements | 102 | 1,186 | 5,251 | 6,449
Amount of losses reclassified from accumulated OCI into income | 246 | 493 | 827 | 1,518
Interest rate swap agreements | Debt Expense (Including Refinancing Charges) |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements | 45 | (1,128) | (815) | (4,798)
Amount of losses reclassified from accumulated OCI into income | (25) | (655) | (299) | (2,061)
Interest rate cap agreements | Debt Expense (Including Refinancing Charges) |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements | (300) | (1,909) | (12,674) | (11,715)
Amount of losses reclassified from accumulated OCI into income | $ (609) | $ (609) | $ (1,829) | $ (1,829)

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