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	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in other comprehensive income	$ 11,804
Loss reclassified from accumulated other comprehensive income into interest expense	$ 2,735