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Acquisition of Torrens University and Associated Assets in Australia and New Zealand - Narrative (Details) $ in Thousands		3 Months Ended	9 Months Ended
	Nov. 03, 2020 USD ($) student industryVertical	Mar. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 1,280,221	$ 1,318,526
Measurement period adjustment, goodwill			262
Torrens University and Related Assets in Australia and New Zealand (ANZ)
Business Acquisition [Line Items]
Number of students | student	19,000
Number of industries | industryVertical	5
Purchase price paid in cash at closing	$ 658,400
Value of business acquisition agreement	642,700
Purchase price adjustment	15,700
Net cash increase at closing	11,000
Working capital increase at closing	4,700
Goodwill	$ 546,315
Acquisition related costs			$ 8,100
Measurement period adjustment, property and equipment		$ 300
Measurement period adjustment, goodwill		$ 300

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