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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 3 Months Ended
Jul. 01, 2018
USD ($)
Mar. 31, 2023
USD ($)
segment
item
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Summary Of Significant Accounting Policies          
Investments   $ 89,483   $ 61,295  
Other assets   $ 1,963   1,687  
Number of operating segments | segment   1      
Number of reporting units | segment   1      
Number of university partners | item   27      
Goodwill   $ 160,766   160,766  
Unbilled revenue   4,076   5,560  
Amounts written off   0      
Allowance for doubtful accounts   0      
Stockholders equity   659,250 $ 706,437 637,619 $ 1,045,047
Income tax expense   17,047 $ 19,592    
Cash in excess of FDIC insured limits   $ 104,496   119,639  
Revenue Benchmark | Customer Concentration Risk | Grand Canyon University          
Summary Of Significant Accounting Policies          
Concentration risk percentage   88.50% 87.60%    
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   $ 1,021   $ 910  
University partner relationships          
Summary Of Significant Accounting Policies          
Estimated average useful life   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%