Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands		3 Months Ended			12 Months Ended
	Jul. 01, 2018 USD ($)	Mar. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)
Summary Of Significant Accounting Policies
Investments		$ 62,396	$ 0
Other assets		$ 1,802	1,943
Number of operating segments | segment		1
Number of reporting units | segment		1
Unbilled revenue		$ 141	3,841
Amounts written off		0
Allowance for doubtful accounts		0
Allowance for credit losses				$ 5,000
Stockholders equity		706,437	1,045,047	1,588,678		$ 1,574,329
Income tax expense		19,592		$ 19,985
Reversal of credit loss reserve			5,000
Cash in excess of FDIC insured limits		$ 200,926	600,130
Revenue Benchmark | Customer Concentration Risk | Grand Canyon University
Summary Of Significant Accounting Policies
Concentration risk percentage		87.60%		87.40%
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		$ 969	$ 1,168
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%
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