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Business Combinations - Revenue and Net Loss (Details) - USD ($) $ in Thousands	3 Months Ended								5 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Revenues	$ 242,103	$ 160,945	$ 114,668	$ 116,469	$ 118,707	$ 108,512	$ 112,720	$ 114,912		$ 634,185	$ 454,851	$ 441,088
Net income (loss)	$ 22,455	$ (52,781)	$ 5,188	$ 9,467	$ (6,495)	$ 6,227	$ 10,302	$ 10,578		$ (15,671)	$ 20,612	$ 34,802
Capella Education Company
Business Acquisition [Line Items]
Revenues									$ 160,400
Net income (loss)									$ (39,600)

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