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Supplemental Financial Statement Information - Schedule of Commissions Receivable (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Change in Contract with Customer, Asset [Roll Forward]        
Beginning balance     $ 792,405 $ 589,222
Total revenue $ 63,914 $ 94,284 294,685 289,458
Cash receipts     (311,310) (237,213)
Net change in credit loss allowance     207 (1,650)
Ending balance 757,368 604,345 757,368 604,345
Medicare        
Change in Contract with Customer, Asset [Roll Forward]        
Beginning balance     739,637 550,922
Cash receipts     (276,825) (201,256)
Net change in credit loss allowance     188 (1,536)
Ending balance 687,274 562,426 687,274 562,426
Individual, Family and Small Business        
Change in Contract with Customer, Asset [Roll Forward]        
Beginning balance     52,768 38,300
Cash receipts     (34,485) (35,957)
Net change in credit loss allowance     19 (114)
Ending balance 70,094 41,919 70,094 41,919
Commission Revenue from Members Approved During the Period        
Change in Contract with Customer, Asset [Roll Forward]        
Total revenue 47,590 56,052 252,469 219,500
Commission Revenue from Members Approved During the Period | Medicare        
Change in Contract with Customer, Asset [Roll Forward]        
Total revenue 42,698 52,040 235,974 205,330
Commission Revenue from Members Approved During the Period | Individual, Family and Small Business        
Change in Contract with Customer, Asset [Roll Forward]        
Total revenue 4,892 4,012 16,495 14,170
Commission Revenue from Renewals of Small Business Members During the Period        
Change in Contract with Customer, Asset [Roll Forward]        
Total revenue 1,744 1,122 6,154 5,005
Commission Revenue from Renewals of Small Business Members During the Period | Medicare        
Change in Contract with Customer, Asset [Roll Forward]        
Total revenue     0 0
Commission Revenue from Renewals of Small Business Members During the Period | Individual, Family and Small Business        
Change in Contract with Customer, Asset [Roll Forward]        
Total revenue 1,744 1,122 6,154 5,005
Net Commission Revenue from Members Approved in Prior Periods        
Change in Contract with Customer, Asset [Roll Forward]        
Total revenue 9,857 16,370 17,443 29,481
Net Commission Revenue from Members Approved in Prior Periods | Medicare        
Change in Contract with Customer, Asset [Roll Forward]        
Total revenue (171) (698) (11,700) 8,966
Net Commission Revenue from Members Approved in Prior Periods | Individual, Family and Small Business        
Change in Contract with Customer, Asset [Roll Forward]        
Total revenue $ 10,028 $ 17,068 $ 29,143 $ 20,515