Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables deemed uncollectible, period	2 years
Deferred online course development costs	$ 3,084	$ 15,258
Deferred accreditation costs	219	241
Deferred costs, gross	27,108	33,361
Accumulated amortization of deferred costs	(21,127)	(15,738)
Unamortized balances of deferred financing costs	3,588	53,292
Advertising costs	$ 53,629	45,318	$ 53,819
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract cost, amortization period	2 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract cost, amortization period	4 years
Peru
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Undistributed foreign earnings	$ 100
Commission and Bonuses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized contract cost, net	$ 2,678	$ 2,124