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	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,376	$ 2,621
Contingent payments	(1,448)	(1,456)
Interest expense and foreign exchange activity included in earnings	72	211
Ending balance	$ 0	$ 1,376