Derivatives and Hedging (Detail) - Derivative Gains And Losses That Have Been Recognized In Condensed Consolidated Statements Of Operations (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Derivative Instruments Gain Loss Recognized In Income Net	$ 3,000		$ 5,300		$ 7,900
Interest Expense [Member]
Derivative Instruments Gain Loss Recognized In Income Net	3,600	[1]	4,100	[1]	10,700	[1]
Other Income And Expense [Member]
Derivative Instruments Gain Loss Recognized In Income Net	$ (600)	[2]	$ 1,200	[2]	$ (2,800)	[2]

[1] Consists of interest expense from interest rate swap contracts.

[2] Consists of realized and unrealized gains and losses on foreign currency forward contracts.