Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands		6 Months Ended	12 Months Ended
	Jul. 01, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) Agency project segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Costs capitalized to obtain or fulfill contracts with customers			$ 0
Reduction in revenue due to scholarships offered to students		$ 101,176			$ 196,334
Other assets			1,706	$ 478
Unbilled revenue amounts			118
Amounts written off			0
Allowance for doubtful accounts			$ 0
Number of operating segments | segment			1
Number of reporting units | segment			1
Lease liabilities			$ 28,603			$ 498
Right-of-use assets acquired			13,069
Lease liability acquired			$ 13,069
Election of hindsight practical expedient			true
Election of package of practical expedients			true
Loss in investment interest and other				$ 372
Capitalized interest rate on borrowings to finance improvements				3.70%	2.80%
Property and equipment, useful life			15 years
Royalty amortization period			20 years
Remaining prepaid royalty assets impaired	$ 3,037
Reserve for uncertain tax positions including interest and penalties			$ 6,773	$ 1,960
Amortization of other current assets			twelve-month
Number of stages of software development projects | project			3
Computer Software
Summary Of Significant Accounting Policies [Line Items]
Estimated average useful life			3 years
Capitalized Content Development
Summary Of Significant Accounting Policies [Line Items]
Other assets			$ 1,077
Estimated average useful life			4 years
Furniture, Fixtures and Equipment
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life			10 years
Computer Equipment
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life			4 years
Vehicles
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life			5 years
Minimum
Summary Of Significant Accounting Policies [Line Items]
Initial contract terms			7 years
Number of major rating agencies reporting credit ratings | Agency			1
Minimum | Land Improvements and Buildings
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life			10 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Initial contract terms			15 years
Maximum | Land Improvements and Buildings
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life			40 years