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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 01, 2020
USD ($)
Jul. 01, 2018
USD ($)
Jul. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
item
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
segment
item
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]                  
Funding to GCU             $ 75,000 $ 169,819  
Repayment of funding to GCU             75,000 60,000  
Other assets         $ 1,763   $ 1,763   $ 1,706
Number of operating segments | segment             1    
Number of reporting units | segment             1    
Unbilled revenue         5,519   $ 5,519    
Amounts written off             0    
Allowance for doubtful accounts         0   0    
Lease liabilities         $ 61,443   $ 61,443    
Number of university partners | item         25   25    
Accounts receivable credit losses             $ 0    
Allowance for credit losses $ 5,000       $ 5,000   5,000    
Retained earnings         1,507,953   1,507,953   1,341,344
Income tax expense         13,141 $ 15,171 $ 51,278 $ 40,752  
Revenue Benchmark | Customer Concentration Risk                  
Summary Of Significant Accounting Policies [Line Items]                  
Concentration risk percentage             86.50% 89.00%  
Computer Software                  
Summary Of Significant Accounting Policies [Line Items]                  
Estimated average useful life             3 years    
Capitalized Content Development                  
Summary Of Significant Accounting Policies [Line Items]                  
Estimated average useful life             4 years    
Other assets         $ 1,031   $ 1,031    
Interest Rate Corridor | 30 Day LIBOR equal to 1.5% through 3.0%                  
Summary Of Significant Accounting Policies [Line Items]                  
Interest rate spread on 30 Day LIBOR         1.50%   1.50%    
Interest Rate Corridor | 30 Day LIBOR exceeds 3.0%                  
Summary Of Significant Accounting Policies [Line Items]                  
Interest rate spread on 30 Day LIBOR         1.50%   1.50%    
Cash Flow Hedging                  
Summary Of Significant Accounting Policies [Line Items]                  
Effective portion of losses on derivatives included as a component of other comprehensive income, net of taxes             $ 418    
Other Assets                  
Summary Of Significant Accounting Policies [Line Items]                  
Fair values of interest rate corridor instrument                 $ 79
Minimum                  
Summary Of Significant Accounting Policies [Line Items]                  
Initial contract terms             7 years    
Minimum | Interest Rate Corridor | 30 Day LIBOR equal to 1.5% through 3.0%                  
Summary Of Significant Accounting Policies [Line Items]                  
30 Day LIBOR index rate         1.50%   1.50%    
Minimum | Interest Rate Corridor | 30 Day LIBOR exceeds 3.0%                  
Summary Of Significant Accounting Policies [Line Items]                  
30 Day LIBOR index rate         3.00%   3.00%    
Maximum                  
Summary Of Significant Accounting Policies [Line Items]                  
Initial contract terms             15 years    
Maximum | Interest Rate Corridor | 30-day LIBOR                  
Summary Of Significant Accounting Policies [Line Items]                  
30 Day LIBOR index rate         1.50%   1.50%    
Maximum | Interest Rate Corridor | 30 Day LIBOR equal to 1.5% through 3.0%                  
Summary Of Significant Accounting Policies [Line Items]                  
30 Day LIBOR index rate         3.00%   3.00%    
Grand Canyon University                  
Summary Of Significant Accounting Policies [Line Items]                  
Purchase price of assets   $ 870,097              
Interest rate on Secured Note   6.00%              
Term of additional lending to GCU for approved capital expenditures   3 years              
Funding provided to GCU, net of repayments             $ 99,815    
Funding to GCU       $ 75,000          
Repayment of funding to GCU     $ 75,000            
Master Services Agreement | Grand Canyon University                  
Summary Of Significant Accounting Policies [Line Items]                  
Percentage of tuition and fee revenue used for closing of purchase agreement   60.00%              
Restatement Adjustment | ASU 2016-13                  
Summary Of Significant Accounting Policies [Line Items]                  
Allowance for credit losses 5,000                
Retained earnings (3,832)                
Income tax expense $ 1,168