Changes in Level 3 Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 2,621	$ 7,389
Contingent payments	(1,456)	(4,866)
Interest expense and foreign exchange activity included in earnings	211	98
Ending balance	1,376	2,621
Deferred Compensation
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	0	704
Contingent payments	0	(712)
Interest expense and foreign exchange activity included in earnings	0	8
Ending balance	$ 0	$ 0