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Cost-Reduction Actions - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($) employee	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($) employee
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 27,500,000	$ 0	$ 52,900,000
Charges related to work-force reductions		24,200,000		36,700,000
Other expenses related to the cost-reduction effort		3,300,000		16,200,000
Cost of Revenue | Services
Restructuring Cost and Reserve [Line Items]
Restructuring charges		19,100,000		27,600,000
Cost of Revenue | Technology
Restructuring Cost and Reserve [Line Items]
Restructuring charges		400,000		400,000
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges		8,200,000		19,500,000
Research and development expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges				300,000
Other income (expense), net
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(200,000)		5,100,000
Employee severance and idle leased facilities
Restructuring Cost and Reserve [Line Items]
Expense (income) for changes in estimates	$ 700,000		(2,200,000)
Idle leased facilities
Restructuring Cost and Reserve [Line Items]
Expense (income) for changes in estimates			$ 1,400,000
Other expenses related to the cost-reduction effort				2,900,000
Contract amendment and termination
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort		1,900,000		5,200,000
Professional fees and other
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort		1,600,000		3,000,000
Net foreign currency translation adjustment
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort		(200,000)		5,100,000
Net foreign currency translation adjustment | Other income (expense), net
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(200,000)		5,100,000
United States
Restructuring Cost and Reserve [Line Items]
Charges related to work-force reductions		$ 4,800,000		$ 5,300,000
Number of employees | employee		369		414
United States | Changes in estimates
Restructuring Cost and Reserve [Line Items]
Charges related to work-force reductions		$ (100,000)		$ (200,000)
Non-US
Restructuring Cost and Reserve [Line Items]
Charges related to work-force reductions		$ 19,800,000		$ 24,000,000
Number of employees | employee		301		376
Non-US | Changes in estimates
Restructuring Cost and Reserve [Line Items]
Charges related to work-force reductions		$ (300,000)		$ (600,000)
Non-US | Additional benefits provided in 2017
Restructuring Cost and Reserve [Line Items]
Charges related to work-force reductions				$ 8,200,000

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