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Cost Reduction Actions - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) Employee
Restructuring Cost and Reserve [Line Items] |  |
Estimated pretax restructuring charge |  | $ 118.5
Work-force reduction charges |  | 78.8
Asset impairments and other expenses related to the cost reduction effort |  | 39.7
Asset impairment Charges |  | 20.2
Other expenses related to the cost reduction effort |  | 19.5
United States |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance costs |  | $ 27.9
Number of employees | Employee |  | 700
Non-US |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance costs |  | $ 50.9
Number of employees | Employee |  | 782
Scenario, Forecast |  |
Restructuring Cost and Reserve [Line Items] |  |
Estimated pretax restructuring charge | $ 300.0 |
Cost of Revenue | Services |  |
Restructuring Cost and Reserve [Line Items] |  |
Estimated pretax restructuring charge |  | $ 52.3
Cost of Revenue | Technology |  |
Restructuring Cost and Reserve [Line Items] |  |
Estimated pretax restructuring charge |  | 0.3
Selling, general and administrative expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Estimated pretax restructuring charge |  | 53.5
Research and development expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Estimated pretax restructuring charge |  | $ 12.4

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