Fair Value Measurements - Reconciliation of Beginning and Ending Balance of Level 3 Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) [Member]	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) [Member] Warrants and equity securities [Member]	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) [Member] Acquisition Earnout Accruals [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance at December 31, 2013	$ 24,921	$ 24,287	$ (13,437)	$ 616	$ (14,053)
Realized / unrealized gains			68	68
Earnout accretion			(1,308)		(1,308)
Earnout payments			3,390		3,390
Foreign currency translation			74		74
Balance at September 30, 2014	$ 24,921	$ 24,287	$ (11,213)	$ 684	$ (11,897)