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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Jul. 01, 2018
USD ($)
Sep. 30, 2023
USD ($)
item
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
segment
item
Sep. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Summary Of Significant Accounting Policies                      
Investments   $ 97,553   $ 97,553       $ 61,295      
Other assets   $ 2,136   $ 2,136       1,687      
Number of operating segments | segment       1              
Number of reporting units | segment       1              
Number of university partners | item   25   25              
Goodwill   $ 160,766   $ 160,766       160,766      
Unbilled revenue   7,778   7,778       5,560      
Amounts written off       0              
Allowance for doubtful accounts   0   0              
Stockholders equity   650,530 $ 591,556 650,530 $ 591,556 $ 645,425 $ 659,250 637,619 $ 606,638 $ 706,437 $ 1,045,047
Income tax expense   8,537 $ 6,249 34,636 $ 34,463            
Cash in excess of FDIC insured limits   $ 56,119   $ 56,119       119,639      
Revenue Benchmark | Customer Concentration Risk | Grand Canyon University                      
Summary Of Significant Accounting Policies                      
Concentration risk percentage       87.00% 84.90%            
Computer Software                      
Summary Of Significant Accounting Policies                      
Estimated average useful life   3 years   3 years              
Capitalized Content Development                      
Summary Of Significant Accounting Policies                      
Estimated average useful life   4 years   4 years              
Other assets   $ 906   $ 906       $ 910      
University partner relationships                      
Summary Of Significant Accounting Policies                      
Estimated average useful life   25 years   25 years              
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                    
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%