Derivative Instruments and Hedging Activities - Gains and Losses, Net of Tax, Related to Derivative Instruments Designated as Cash Flow Hedges Included in Accumulated Other Comprehensive Income, Net (Detail) (Cash Flow Hedging, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated OCI on derivative (dffective portion)	$ 1,107	$ (3,421)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated OCI on derivative (dffective portion)	(6)	(6)
Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated OCI on derivative (dffective portion)	$ 1,113	$ (3,415)