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Investments in Affiliates and Related Transactions (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]                        
Reduction in revenue $ (69,377,000) $ (68,636,000) $ (76,535,000) $ (77,122,000) $ (90,588,000) $ (52,210,000) $ (77,846,000) $ (88,105,000) $ (291,670,000) $ (308,749,000) $ (325,839,000)  
Accounts receivable, net [1] 47,849,000       65,863,000       47,849,000 65,863,000    
Digital                        
Schedule of Equity Method Investments [Line Items]                        
Reduction in revenue                 (56,082,000) (53,802,000)    
Discontinued Operations, Disposed of by Sale | BPO Divestiture                        
Schedule of Equity Method Investments [Line Items]                        
Discontinued operation after disposal, revenue                 0 0    
Discontinued Operations, Disposed of by Sale | BPO Divestiture | Cloud Technology and Support                        
Schedule of Equity Method Investments [Line Items]                        
Discontinued operation after disposal, revenue                 0 (6,900,000)    
Sequential Technology International L L C And A P Capital Holdings I I L L C                        
Schedule of Equity Method Investments [Line Items]                        
Other assets fair value disclosure     4,800,000                  
Sequential Technology International L L C And A P Capital Holdings I I L L C | Loans Payable                        
Schedule of Equity Method Investments [Line Items]                        
Face amount     9,000,000.0                  
Contingent consideration, liability     $ 16,000,000.0                  
Interest rate, as a percent     8.00%                  
Term     3 years                  
Proceeds from sale, percentage     5.00%                  
Sequential Technology International, LLC                        
Schedule of Equity Method Investments [Line Items]                        
Duration of services agreement                       3 years
Consideration received       $ 1,600,000                
STIN                        
Schedule of Equity Method Investments [Line Items]                        
Accounts receivable, net $ 0       $ 8,100,000       0 $ 8,100,000    
STIN | Digital                        
Schedule of Equity Method Investments [Line Items]                        
Reduction in revenue           $ 26,000,000.0     $ 26,000,000.0      
[1] See Note 7. Investments in Affiliates and Related Transactions for related party transactions reflected in this account.