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Supplemental Financial Statement Information - Schedule of Commissions Receivable (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Change in Contract with Customer, Asset [Roll Forward]    
Beginning balance $ 792,405 $ 589,222
Total revenue 134,214 106,408
Cash receipts (177,532) (126,542)
Change in credit loss allowance (78) (1,632)
Ending balance 741,847 560,717
Medicare    
Change in Contract with Customer, Asset [Roll Forward]    
Beginning balance 739,637 550,922
Cash receipts (165,520) (112,731)
Change in credit loss allowance (72) (1,574)
Ending balance 688,737 526,721
Individual, Family and Small Business    
Change in Contract with Customer, Asset [Roll Forward]    
Beginning balance 52,768 38,300
Cash receipts (12,012) (13,811)
Change in credit loss allowance (6) (58)
Ending balance 53,110 33,996
Commission revenue from members approved during the period    
Change in Contract with Customer, Asset [Roll Forward]    
Total revenue 121,073 86,921
Commission revenue from members approved during the period | Medicare    
Change in Contract with Customer, Asset [Roll Forward]    
Total revenue 114,678 81,125
Commission revenue from members approved during the period | Individual, Family and Small Business    
Change in Contract with Customer, Asset [Roll Forward]    
Total revenue 6,395 5,796
Commission revenue from renewals of small business members during the period    
Change in Contract with Customer, Asset [Roll Forward]    
Total revenue 2,687 2,396
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 2,687 2,396
Net commission revenue adjustments from members approved in prior period    
Change in Contract with Customer, Asset [Roll Forward]    
Total revenue 3,292 10,352
Net commission revenue adjustments from members approved in prior period | Medicare    
Change in Contract with Customer, Asset [Roll Forward]    
Total revenue 14 8,979
Net commission revenue adjustments from members approved in prior period | Individual, Family and Small Business    
Change in Contract with Customer, Asset [Roll Forward]    
Total revenue $ 3,278 $ 1,373