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	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated OCI on derivative (effective portion)	$ (1,631)	$ 1,610
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated OCI on derivative (effective portion)	0	(26)
Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated OCI on derivative (effective portion)	$ (1,631)	$ 1,636