Restructuring - Summary of Historical Restructuring Liability (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2016
Q2 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring liability, Beginning balance	$ 21,837	$ 25,089	$ 26,406	$ 26,406
Restructuring expense and adjustments	50	417	456	923
Cash payments	(1,079)	(3,669)	(1,773)	(6,521)
Restructuring liability, Ending balance	20,808	21,837	25,089	20,808
Q1 2014 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring liability, Beginning balance	2,184	1,525	2,290	2,290
Restructuring expense and adjustments	(104)	1,267	16	1,179
Cash payments	(2,064)	(608)	(781)	(3,453)
Restructuring liability, Ending balance	16	2,184	1,525	16
Other Restructuring Plans [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring liability, Beginning balance	83	(82)	332	332
Restructuring expense and adjustments	6	18	(10)	14
Cash payments	(22)	147	(404)	(279)
Restructuring liability, Ending balance	$ 67	$ 83	$ (82)	$ 67