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Effects of Interest Rate Swap and Cap Agreements (Detail) - Cash Flow Hedging - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments Gain Loss [Line Items]        
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements $ (1,815) $ (2,616) $ (5,002) $ (8,085)
Amount of losses reclassified from accumulated OCI into income 1,265 448 2,529 913
Tax benefit        
Derivative Instruments Gain Loss [Line Items]        
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements 1,154 1,667 3,184 5,149
Amount of losses reclassified from accumulated OCI into income (805) (285) (1,610) (581)
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 0 (168) 0 (860)
Amount of losses reclassified from accumulated OCI into income 0 123 0 274
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 (2,969) (4,115) (8,186) (12,374)
Amount of losses reclassified from accumulated OCI into income $ 2,070 $ 610 $ 4,139 $ 1,220