Marketable Securities and Fair Value Disclosures - Summary of Changes in Fair Value of Company's Level 3 Financial Assets and Liabilities Measured on Recurring Basis (Detail) (Fair Value, Measurements, Level 3 [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Fair Value, Measurements, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	$ 901
Change in fair value of acquired indemnification assets, included in currency translation adjustments	60
Assets, Ending Balance	831
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, Beginning Balance	23,663
Payment of contingent consideration liability	(5,500)
Change in fair value of contingent consideration liability, included in acquisition costs and other related benefits	(973)
Change in fair value of acquired contingent consideration liability, included in currency translation adjustments	161
Increase in fair value of contingent consideration liability, included in general and administrative expenses	430
Change in indemnification assets recorded in acquisitions	(130)
Liabilities, Ending Balance	$ 17,781