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Cost-Reduction Actions - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
employee
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 0 $ 25,400,000
Severance costs   12,500,000
Other expenses related to the cost reduction effort   12,900,000
Cost of Revenue | Services    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   8,500,000
Selling, general and administrative expenses    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   11,300,000
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   5,300,000
Idle leased facilities    
Restructuring Cost and Reserve [Line Items]    
Other expenses related to the cost reduction effort   2,900,000
Income for changes in estimates 100,000  
Contract amendment and termination    
Restructuring Cost and Reserve [Line Items]    
Other expenses related to the cost reduction effort   3,300,000
Professional fees and other    
Restructuring Cost and Reserve [Line Items]    
Other expenses related to the cost reduction effort   1,400,000
Net foreign currency translation adjustment    
Restructuring Cost and Reserve [Line Items]    
Other expenses related to the cost reduction effort   5,300,000
Net foreign currency translation adjustment | Other income (expense), net    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   5,300,000
Employee severance and idle leased facilities    
Restructuring Cost and Reserve [Line Items]    
Income for changes in estimates $ (2,900,000)  
United States    
Restructuring Cost and Reserve [Line Items]    
Severance costs   $ 500,000
Number of employees | employee   45
United States | Changes in estimates    
Restructuring Cost and Reserve [Line Items]    
Severance costs   $ (100,000)
Non-US    
Restructuring Cost and Reserve [Line Items]    
Severance costs   $ 4,200,000
Number of employees | employee   75
Non-US | Changes in estimates    
Restructuring Cost and Reserve [Line Items]    
Severance costs   $ (300,000)
Non-US | Additional benefits provided in 2017    
Restructuring Cost and Reserve [Line Items]    
Severance costs   $ 8,200,000