Restructuring - Summary of Historical Restructuring Liability (Detail) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016
Q2 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring liability, Beginning balance	$ 20,808	$ 21,837	$ 25,089	$ 26,406	$ 26,406
Restructuring expense and adjustments	3	50	417	456	926
Cash payments, net of receipts	(1,423)	(1,079)	(3,669)	(1,773)	(7,944)
Restructuring liability, Ending balance	19,388	20,808	21,837	25,089	19,388
Q1 2014 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring liability, Beginning balance	16	2,184	1,525	2,290	2,290
Restructuring expense and adjustments	(202)	(104)	1,267	16	977
Cash payments, net of receipts	218	(2,064)	(608)	(781)	(3,235)
Restructuring liability, Ending balance	32	16	2,184	1,525	32
Other Restructuring Plans [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring liability, Beginning balance	67	83	(82)	332	332
Restructuring expense and adjustments	7	6	18	(10)	21
Cash payments, net of receipts	(23)	(22)	147	(404)	(302)
Restructuring liability, Ending balance	$ 51	$ 67	$ 83	$ (82)	$ 51