Fair Value Measures and Other Financial Instruments - Schedule of Effect of Interest Rate Swaps Designated as Cash Flow Hedges (Detail) (Cash Flow Hedging [Member], Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income	$ 6,162	$ (7,740)	$ 6,089	$ (8,000)
Loss reclassified from accumulated other comprehensive income into interest expense	$ (1,013)	$ (473)	$ (2,011)	$ (734)