Changes in Level 3 Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) - Significant Unobservable Inputs (Level 3) - Contingent Consideration - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,394	$ 2,743	$ 2,621	$ 1,376
Contingent payments		(1,456)		(1,448)
Interest expense and foreign exchange activity included in earnings	(17)	107	122	72
Ending balance	$ 1,377	$ 1,394	$ 2,743	$ 0