Corporate Restructuring and Other Organizational Changes - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Position	Dec. 31, 2014 USD ($) Position	Dec. 31, 2013 USD ($) Position
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 1,300	$ 8,700	$ 8,900
Number of positions eliminated | Position	30	220	147
Restructuring costs	$ 3,056	$ 9,024
Employee termination costs paid during the period		6,200
Restructuring charges	1,045	2,793	$ 3,341
Other Current Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges	300
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2,872	7,741
Severance liability to be paid over the next 12 months	800
Restructuring charges	777	2,341	1,470
General and Administrative | Leased Facilities in Chantilly, VA, North Brunswick, NJ, Columbus, OH, Duluth, GA, and Bangalore, India
Restructuring Cost and Reserve [Line Items]
Lease termination fee			1,700
Americas [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	700	5,700	6,300
EMEA [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 600	2,000	2,200
Asia/Pacific [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 1,000	$ 400