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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 3 Months Ended
Jul. 01, 2018
Mar. 31, 2024
USD ($)
segment
item
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Summary Of Significant Accounting Policies          
Insurance receivable   $ 25,500      
Investments   94,485   $ 98,031  
Other assets   $ 1,755   1,641  
Number of operating segments | segment   1      
Number of reporting units | segment   1      
Number of university partners | item   23      
Goodwill   $ 160,766   160,766  
Unbilled revenue   2,956   188  
Amounts written off   0      
Allowance for doubtful accounts   0      
Stockholders equity   759,447 $ 659,250 718,014 $ 637,619
Income tax expense   20,195 $ 17,047    
Cash in excess of FDIC insured limits   $ 195,207   145,474  
Revenue Benchmark | Customer Concentration Risk | Grand Canyon University          
Summary Of Significant Accounting Policies          
Concentration risk percentage   89.70% 88.50%    
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   $ 726   $ 746  
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      
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%