Summary of Significant Accounting Policies - Summary of Revenues Disaggregated by Nature of Transfer of Services (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenues									$ 613,675
Scholarships									(101,176)			$ (196,334)
Net Revenues	$ 213,247	$ 193,289	$ 174,820	$ 197,287	$ 177,548	$ 155,454	$ 236,818	$ 275,681	512,499	$ 778,643	$ 845,501	$ 974,134
Tuition Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues									522,430
Ancillary Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues									$ 91,245