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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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