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Acquisitions - Purchase of an Asset Group Consituting a Business - CEM Business (Details) - USD ($)
$ in Thousands
 6 Months Ended
Apr. 30, 2016
Dec. 31, 2016
Jun. 30, 2016
Business Acquisition [Line Items]      
Goodwill   $ 2,597,685 $ 2,325,586
Goodwill adjustment relating to acquisition   (30)  
CEM Business      
Business Acquisition [Line Items]      
Purchase consideration $ 160,000    
Amount held back and unpaid 7,300    
Current assets 3,078    
Non-current tangible assets 12,589    
Liabilities assumed (26,478)    
Total identifiable net assets 69,189    
Goodwill 90,811    
Net assets acquired 160,000    
Goodwill expected to be tax deductible 77,000    
Goodwill adjustment relating to acquisition   $ 100  
Customer assets | CEM Business      
Business Acquisition [Line Items]      
Acquired intangible assets 33,000    
Technology assets | CEM Business      
Business Acquisition [Line Items]      
Acquired intangible assets $ 47,000