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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 36 Months Ended
Jul. 01, 2018
USD ($)
Jun. 30, 2021
USD ($)
item
Jun. 30, 2021
USD ($)
item
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
segment
item
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2021
USD ($)
item
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Summary Of Significant Accounting Policies                      
Other assets   $ 2,485 $ 2,485   $ 2,485     $ 2,485   $ 1,844  
Number of operating segments | segment         1            
Number of reporting units | segment         1            
Unbilled revenue   8,811 8,811   $ 8,811     8,811   294  
Amounts written off         0            
Allowance for doubtful accounts   0 0   0     0      
Lease liabilities   62,524 62,524   62,524     62,524      
Secured Note receivable, carrying value   1,154,912 1,154,912   1,154,912     1,154,912   964,912  
Secured Note receivable, fair value   $ 1,231,524 $ 1,231,524   $ 1,231,524     $ 1,231,524   1,049,458  
Number of university partners | item   27 27   27     27      
Allowance for credit losses   $ 5,000 $ 5,000 $ 5,000 $ 5,000 $ 5,000 $ 5,000 $ 5,000   5,000  
Stockholders equity   1,542,683 1,542,683 1,489,387 1,542,683 1,489,387 1,443,433 1,542,683 $ 1,588,678 1,574,329 $ 1,448,008
Income tax expense     15,035 15,346 $ 35,020 $ 38,137          
Revenue Benchmark | Customer Concentration Risk | Grand Canyon University                      
Summary Of Significant Accounting Policies                      
Concentration risk percentage         85.70% 87.00%          
Computer Software                      
Summary Of Significant Accounting Policies                      
Estimated average useful life         3 years            
Capitalized Content Development                      
Summary Of Significant Accounting Policies                      
Estimated average useful life         4 years            
Other assets   1,214 $ 1,214   $ 1,214     1,214   $ 1,198  
Minimum                      
Summary Of Significant Accounting Policies                      
Initial contract terms of service agreements         7 years            
Maximum                      
Summary Of Significant Accounting Policies                      
Initial contract terms of service agreements         15 years            
Grand Canyon University                      
Summary Of Significant Accounting Policies                      
Purchase price of assets $ 870,097                    
Interest rate on Secured Note 6.00%                    
Funding provided to GCU, net of repayments   $ 190,000           $ 289,815      
Master Services Agreement | Grand Canyon University                      
Summary Of Significant Accounting Policies                      
Percentage of tuition and fee revenue used for closing of purchase agreement 60.00%                    
Cumulative Effect of Adoption Adjustment | ASU 2016-13                      
Summary Of Significant Accounting Policies                      
Allowance for credit losses       5,000   $ 5,000 5,000        
Stockholders equity       $ (3,832)   (3,832) (3,832)        
Income tax expense           $ 1,168 $ 1,168