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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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