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Accounting Standards and Significant Accounting Policies - Additional Information (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle      
Recurring revenue percentage of total revenue (percent) 73.00%    
Cash and investments $ 649,600,000    
Revolving line of credit 0   $ 0
Accounts receivable, net 387,100,000   396,500,000
Allowance for losses 9,800,000    
Case Management, Business Process Management, Data and Insight      
New Accounting Pronouncements or Change in Accounting Principle      
Goodwill assessed for impairment $ 152,000,000.0    
Percentage of total goodwill (percent) 18.00%    
Data and Insight      
New Accounting Pronouncements or Change in Accounting Principle      
Goodwill assessed for impairment   $ 75,700,000  
Unbilled Revenues      
New Accounting Pronouncements or Change in Accounting Principle      
Accounts receivable, net $ 138,200,000   134,000,000.0
Unbilled Revenues | Retention Receivable      
New Accounting Pronouncements or Change in Accounting Principle      
Accounts receivable, net 13,600,000   $ 13,100,000
Revolving Credit Facility | Credit Agreement      
New Accounting Pronouncements or Change in Accounting Principle      
Revolving line of credit 0    
Line of credit facility, unused borrowing capacity $ 400,000,000.0