Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

v3.10.0.1
Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
primary_source
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
primary_source
Jun. 30, 2017
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule Of Significant Accounting Policies [Line Items]            
Property, equipment, and software, net $ 145,340   $ 145,340     $ 148,428
Bad debt expense $ 1,500 $ 800 $ 2,100 $ 1,300    
Primary sources of revenue | primary_source 2   2      
Deferred tax assets, net $ 42,607   $ 42,607   $ 44,107 44,887
Deferred commissions period of benefit 3 years   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   $ 136,900     140,000
International Subsidiaries            
Schedule Of Significant Accounting Policies [Line Items]            
Property, equipment, and software, net $ 8,400   $ 8,400     $ 8,400
Minimum            
Schedule Of Significant Accounting Policies [Line Items]            
Contract duration     1 year