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Effects of Interest Rate Swap and Cap Agreements (Detail) - Cash Flow Hedging - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments Gain Loss [Line Items]      
Amount of losses recognized in OCI on interest rate swap and cap agreements $ (3,670) $ (12,241) $ (10,059)
Amount of gains reclassified from accumulated OCI into income 2,566 3,111 10,608
Tax benefit (expense)      
Derivative Instruments Gain Loss [Line Items]      
Amount of losses recognized in OCI on interest rate swap and cap agreements 2,343 7,844 6,450
Amount of gains reclassified from accumulated OCI into income (1,632) (1,992) (6,801)
Interest rate swap agreements | Debt Expense (Including Refinancing Charges)      
Derivative Instruments Gain Loss [Line Items]      
Amount of losses recognized in OCI on interest rate swap and cap agreements (815) (3,971) (8,390)
Amount of gains reclassified from accumulated OCI into income 299 2,664 12,279
Interest rate cap agreements | Debt Expense (Including Refinancing Charges)      
Derivative Instruments Gain Loss [Line Items]      
Amount of losses recognized in OCI on interest rate swap and cap agreements (5,198) (16,114) (8,119)
Amount of gains reclassified from accumulated OCI into income $ 3,899 $ 2,439 $ 5,130