Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Jul. 01, 2018 USD ($)	Jun. 30, 2023 USD ($) item	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) item segment	Jun. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Summary Of Significant Accounting Policies
Investments		$ 90,444		$ 90,444			$ 61,295
Other assets		$ 2,157		$ 2,157			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		5,525		5,525			5,560
Amounts written off				0
Allowance for doubtful accounts		0		0
Stockholders equity		645,425	$ 606,638	645,425	$ 606,638	$ 659,250	637,619	$ 706,437	$ 1,045,047
Income tax expense		9,052	$ 8,622	26,099	$ 28,214
Cash in excess of FDIC insured limits		$ 142,172		$ 142,172			119,639
Revenue Benchmark | Customer Concentration Risk | Grand Canyon University
Summary Of Significant Accounting Policies
Concentration risk percentage		87.20%	85.10%
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		$ 1,141		$ 1,141			$ 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%