Summary of Restructuring Reserve (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Restructuring And Related Activities [Abstract]
Restructuring reserve beginning balance	$ 371
Restructuring expenses incurred during the period	990	$ 1,919
Adjustments to prior period estimates, net	5
Amounts paid during the period	(458)	(1,011)
Restructuring reserve ending balance	$ 908	$ 908