Fair Value Measurements - Summary of Changes in the Financial Liabilities Measured on a Recurring Basis Using Level 3 Inputs (Detail) - Significant Unobservable Inputs (Level 3) - Fair Value, Measurements, Recurring $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Financial liabilities measured using Level 3 inputs, Opening balance	$ 818
Payment of contingent earn-outs related to 2012 acquisition	(818)
Change in fair value of contingent earn-outs	0
Financial liabilities measured using Level 3 inputs, Ending balance	$ 0