Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands		3 Months Ended		12 Months Ended
	Jul. 01, 2018 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2023 USD ($) project Agency segment item	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policies
Investments				$ 98,031	$ 61,295
Other assets				$ 1,641	1,687
Number of operating segments | segment				1
Number of reporting units | segment				1
Number of university partners | item				25
Goodwill				$ 160,766	160,766
Unbilled revenue amounts				188	5,560
Amounts written off				0
Allowance for doubtful accounts				0
Reserve for uncertain tax positions including interest and penalties				$ 13,631	15,862
Number of stages of software development projects | project				3
Stockholders equity		$ 1,045,047		$ 718,014	637,619	$ 1,045,047	$ 1,574,329
Income tax expense				54,690	55,444	$ 70,945
Reversal of credit loss reserve		$ 5,000
Cash in excess of FDIC insured limits				$ 145,474	$ 119,639
Revenue Benchmark | Customer Concentration Risk | Grand Canyon University
Summary Of Significant Accounting Policies
Concentration risk percentage				87.80%	85.80%
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				$ 746	$ 910
University partner relationships
Summary Of Significant Accounting Policies
Estimated average useful life				25 years
Furniture, Fixtures and Equipment
Summary Of Significant Accounting Policies
Property and equipment, useful life				10 years
Computer Equipment
Summary Of Significant Accounting Policies
Property and equipment, useful life				4 years
Vehicles
Summary Of Significant Accounting Policies
Property and equipment, useful life				5 years
Minimum
Summary Of Significant Accounting Policies
Initial contract terms of service agreements				7 years
Number of major rating agencies reporting credit ratings | Agency				1
Minimum | Land Improvements and Buildings
Summary Of Significant Accounting Policies
Property and equipment, useful life				10 years
Maximum
Summary Of Significant Accounting Policies
Initial contract terms of service agreements				15 years
Maximum | Land Improvements and Buildings
Summary Of Significant Accounting Policies
Property and equipment, useful life				40 years
Asset Purchase Agreement | Grand Canyon University | Disposed of by Sale
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%
Cumulative Effect of Adoption Adjustment | ASU 2016-13
Summary Of Significant Accounting Policies
Allowance for credit losses			$ 5,000				$ 5,000
Stockholders equity			(3,832)
Income tax expense			$ 1,168