Corporate Restructuring and Other Organizational Changes - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) Position	Dec. 31, 2014 USD ($) Position
Restructuring Cost and Reserve [Line Items]
Employee termination costs paid during the period	$ 800
Employee termination costs		$ 1,300	$ 8,700
Number of positions eliminated | Position		30	220
Amounts paid during the period	1,432	$ 3,056
Restructuring charges	4,559	1,045	$ 2,793
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance liability to be paid over the next 12 months	0	800
Amounts paid during the period	778	2,872
Restructuring charges		777	2,341
Facility Closures [Member]
Restructuring Cost and Reserve [Line Items]
Amounts paid during the period	654	184
Restructuring charges	4,559	268	452
Facility Closures [Member] | Other Current Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,100
Facility Closures [Member] | Other Noncurrent Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,500
General and Administrative | Leased Facilities in Watford, UK; Providence, RI; Chantilly, VA; and West Hills, CA
Restructuring Cost and Reserve [Line Items]
Lease termination fee	$ 5,000
Americas Segment [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		700	5,700
EMEA Segment [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 600	2,000
Asia/Pacific Segment [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs			$ 1,000