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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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