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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Net balance of capitalized software development costs | $ 11,900 | $ 8,600 | $ 11,900 | $ 8,600 | $ 13,500
Anti-dilutive shares excluded from computations of earnings per share | 227,000 | 1,377,000 | 282,000 | 1,866,000 |
Cumulative translation losses | $ 143,500 | $ 61,100 | $ 143,500 | $ 61,100 | 142,600
Advertising expense | 21,300 | 17,200 | 40,200 | 37,400 |
Impairment of Long-Lived Assets Held-for-use |  |  | 2,000 |  |
Cost of Goods and Services Sold, Total | 158,232 | 157,443 | 306,885 | 330,619 |
Loss from Catastrophes | 5,600 | 30,300 | 12,500 | 44,000 |
Deferred Revenue, Revenue Recognized |  |  | 95,100 |  |
Allowance for Doubtful Accounts Receivable, Current | 19,500 | 26,800 | 19,500 | 26,800 | 27,600
Asset Impairment Charges | 2,300 |  | 40,100 |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  | 0 | (236) |
Proceeds from Insurance Settlement, Operating Activities |  | 19,000 |  | 20,800 |
Gain on Business Interruption Insurance Recovery | 15,571 | 0 | 15,571 | 0 |
Accounting Standards Update 2016-01 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  | 400 |  |
Noncontrolling Interest |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cumulative translation losses | 3,200 | 1,300 | 3,200 | 1,300 | 3,000
Hurricane Expense [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | 19,000 |  | 29,900 |
Cost of Goods and Services Sold, Total |  |  |  | 13,400 |
Asset Impairment [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Unusual or Infrequent Item, or Both, Insurance Proceeds | $ 5,600 | 30,500 | $ 12,500 | 39,800 |
Minimum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  | 20.00% |  |
Maximum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  | 50.00% |  |
Adtalem Brazil |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Ownership interest of parent in subsidiary | 97.90% |  | 97.90% |  |
Adtalem Global Education Inc. |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cumulative translation losses | $ 140,300 | 59,800 | $ 140,300 | 59,800 | 139,600
Tax effect on unrealized gains on available-for-sale securities |  | 400 |  | 400 | 400
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax |  | $ 200 |  | $ 200 | $ 100
Edupristine |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Ownership interest of parent in subsidiary | 69.00% |  | 69.00% |  |
Kaizen |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Ownership interest of parent in subsidiary | 31.00% |  | 31.00% |  |
Adtalem Brazil Senior Management Group |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Ownership interest of parent in subsidiary | 2.10% |  | 2.10% |  |

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