Effects of Interest Rate Swap Agreements (Detail) (Cash Flow Hedging, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements	$ 169	$ (6,204)	$ (29,049)
Amount of losses reclassified from accumulated OCI into income	12,889	(10,130)	(9,721)
Interest rate swap agreements
Derivative [Line Items]
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements	1,251	(8,838)	(35,767)
Interest rate swap agreements | Debt Expense
Derivative [Line Items]
Amount of losses reclassified from accumulated OCI into income	15,678	(12,989)	(12,622)
Interest rate cap agreements
Derivative [Line Items]
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements	(974)	(1,316)	(11,777)
Interest rate cap agreements | Debt Expense
Derivative [Line Items]
Amount of losses reclassified from accumulated OCI into income	5,418	(3,589)	(3,289)
Tax (expense) benefit
Derivative [Line Items]
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements	(108)	3,950	18,495
Amount of losses reclassified from accumulated OCI into income	$ (8,207)	$ 6,448	$ 6,190