Commitments and Contingencies - Standby Letters of Credit, Surety Bonds and Other Commitments (Details) - USD ($) $ in Thousands	1 Months Ended
	Oct. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Foreign Tax Authority | Tax Authority, Spain
Debt Instrument [Line Items]
Income tax examination, tax payment pending appeal	$ 9,300
Cash Collateralized Letter Of Credit - Spain Tax Audits | Foreign Tax Authority | Tax Authority, Spain
Debt Instrument [Line Items]
Letters of credit outstanding, amount		$ 10,700	$ 11,500
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design
Debt Instrument [Line Items]
Letters of credit outstanding, amount			$ 83,600