Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

v3.8.0.1
Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
primary_source
Mar. 31, 2017
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule Of Significant Accounting Policies [Line Items]        
Property, equipment, and software, net $ 145,522     $ 148,428
Bad debt expense $ 600 $ 400    
Primary sources of revenue | primary_source 2      
Deferred tax assets, net $ 45,205   $ 44,107 44,887
Deferred commissions period of benefit 3 years      
Length of Expected Customer Benefit of License Fees Billed at Initial Order Date        
Schedule Of Significant Accounting Policies [Line Items]        
Expected length of time of benefit from license fees 3 years      
United States        
Schedule Of Significant Accounting Policies [Line Items]        
Property, equipment, and software, net $ 136,900     140,000
International Subsidiaries        
Schedule Of Significant Accounting Policies [Line Items]        
Property, equipment, and software, net $ 8,600     $ 8,400
Minimum        
Schedule Of Significant Accounting Policies [Line Items]        
Contract duration 1 year