Fair Value Measurement - Reconciliation of the Beginning and Ending Level 3 Net Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment of contingent earnout consideration		$ (3,226)
Adjustment to estimated fair value of contingent earnout consideration (included within Selling, general and administrative expense)	$ 928	928
Accretion of contingent earnout consideration (included within other expense, net)		(1,246)	$ (579)
Significant Unobservable Inputs (Level 3) [Member] | Zero2Ten and Branchbird Contingent Earnout Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		10,540
Payment of contingent earnout consideration		(3,906)
Adjustment to estimated fair value of contingent earnout consideration (included within Selling, general and administrative expense)		(928)
Accretion of contingent earnout consideration (included within other expense, net)		1,246
Ending balance	$ 6,952	$ 6,952