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Income Taxes (Detail) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Jun. 30, 2020 USD ($) item	Dec. 31, 2019	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Operating Loss Carryforwards, Federal		$ 100
Operating Loss Carryforwards, State and Local		301,500
Operating Loss Carryforwards, Foreign		23,600
Valuation Allowance		$ 9,937		$ 9,943	$ 11,496
Number of operating units local tax incentives | item		3
Number of active audits | item		2
Effective Income Tax Rate Reconciliation, Percent		(2.70%)		23.50%	56.40%
Gain (Loss) on Derivative Instruments, Net, Pretax		$ 110,723		$ 0	$ 0
Tax benefit related to the loss on sale of Adtalem's investment in Carrington		$ (25,700)
U.S. federal corporate tax rate	21.00%	21.00%		21.00%	28.10%	35.00%
Effective Income Tax Rate Reconciliation Impact On Foreign Tax Rate			10.50%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 11,500		$ 31,800
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		1,500		800	$ 700
Income Tax Examination, Penalties and Interest Expense		$ 0		$ 100	$ (600)

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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