Restructuring and Other - Restructuring and Other Reserve Activities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Restructuring and Related Activities [Abstract]
Reserve balance at January 1	$ 1,824	$ 3,019
Restructuring charges	4,101	2,878
Other charges	1,321	2,856
Non-cash restructuring and other	(182)	(403)
Cash payments	(4,720)	(6,174)
Reserve balance at September 30	$ 2,344	$ 2,176