Fair Value Measurements - Reconciliation of the Beginning and Ending Level 3 Net Liabilities (Detail) (Significant Unobservable Inputs (Level 3) [Member], Contingent Earnout Consideration [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Significant Unobservable Inputs (Level 3) [Member] | Contingent Earnout Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		$ 231	$ 2,800
Change in fair value of earnout consideration (included within selling, general and administrative expense)		(231)	144
Funding of Fullscope contingent earnout consideration escrow			(2,713)
Ending balance			$ 231