Changes In Acquisition-Related Contingent Consideration Liability (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition, Contingent Consideration [Line Items]
Beginning balance		$ 4,372	$ 6,601	$ 6,338	$ 13,329
Acquisition	[1]				(4,495)
Accretion of acquisition-related contingent consideration		159	257	530	792
Remeasurement of acquisition-related contingent				(1,675)	(2,383)
Payments			(200)	(662)	(578)
Change in amount of contingent consideration		(159)	(257)	1,145	1,591
Ending balance		$ 4,531	$ 6,658	$ 4,531	6,658
Foreign Currency Translation
Business Acquisition, Contingent Consideration [Line Items]
Change in amount of contingent consideration					$ (7)

[1] Includes adjustments during the purchase price allocation period.