Gains and Losses, Net of Tax, Related to Derivative Instruments Designated as Cash Flow Hedges Included in the Accumulated Other Comprehensive Income, Net (Detail) (Cash Flow Hedging, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	$ 3,571	$ (439)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	62	609
Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	$ 3,509	$ (1,048)