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Cost-Reduction Actions - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($) employee	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($) employee
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 46,100,000	$ 0	$ 99,000,000
Expense (benefit) for changes in estimates	$ (900,000)		(3,100,000)
Charges related to work-force reductions		49,500,000		86,200,000
Other expenses related to the cost-reduction effort		(3,400,000)		12,800,000
Cost of Revenue | Services
Restructuring Cost and Reserve [Line Items]
Restructuring charges		42,800,000		70,400,000
Cost of Revenue | Technology
Restructuring Cost and Reserve [Line Items]
Restructuring charges				400,000
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges		7,900,000		27,400,000
Research and development expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,100,000		1,400,000
Other income (expense), net
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(5,700,000)		(600,000)
Employee severance and idle leased facilities
Restructuring Cost and Reserve [Line Items]
Expense (benefit) for changes in estimates			(2,900,000)
Idle leased facilities
Restructuring Cost and Reserve [Line Items]
Expense (benefit) for changes in estimates			$ 600,000
Other expenses related to the cost-reduction effort		600,000		3,500,000
Contract amendment and termination
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort		100,000		5,300,000
Professional fees and other
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort		900,000		3,900,000
Net asset sales and write-offs
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort		700,000		700,000
Net foreign currency translation adjustment
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort		(5,700,000)		(600,000)
Net foreign currency translation adjustment | Other income (expense), net
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(5,700,000)		(600,000)
U.S.
Restructuring Cost and Reserve [Line Items]
Charges related to work-force reductions		$ 2,600,000		$ 7,900,000
Number of employees | employee		93		507
U.S. | Changes in estimates
Restructuring Cost and Reserve [Line Items]
Charges related to work-force reductions		$ (400,000)		$ (600,000)
Non-U.S.
Restructuring Cost and Reserve [Line Items]
Charges related to work-force reductions		$ 48,300,000		$ 72,300,000
Number of employees | employee		1,459		1,835
Non-U.S. | Changes in estimates
Restructuring Cost and Reserve [Line Items]
Charges related to work-force reductions		$ (1,000,000)		$ (1,600,000)
Non-U.S. | Additional benefits provided in 2017
Restructuring Cost and Reserve [Line Items]
Charges related to work-force reductions				$ 8,200,000

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