Goodwill and Intangible Assets - Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill, Beginning Balance	$ 174,294	$ 140,807
Acquisitions	(11)	32,888
Foreign currency exchange rate changes	2,004	690
Deferred tax adjustment	63	(91)
Goodwill, Ending Balance	$ 176,350	$ 174,294