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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, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Reserves related to uncollectible accounts and refunds | $ 33,200 | $ 35,000 | $ 33,200 | $ 35,000 | $ 30,600
Net balance of capitalized software development costs | $ 8,600 | $ 15,000 | $ 8,600 | $ 15,000 | 11,800
Anti-dilutive shares excluded from computations of earnings per share | 1,377,000 | 2,643,000 | 1,866,000 | 2,808,000 |
Cumulative translation losses | $ 61,100 | $ 51,100 | $ 61,100 | $ 51,100 | 59,400
Advertising expense | 22,600 | 24,200 | 49,000 | 48,500 |
Provisions For Refund Payments | 4,600 | 4,000 | $ 9,100 | 8,200 |
Noncontrolling Interest, Description |  |  | Where our ownership interest is less than 100%, but greater than 50%, the noncontrolling ownership interest is reported on our Consolidated Balance Sheets. |  |
Impairment of Long-Lived Assets Held-for-use | 19,000 |  | $ 29,900 |  |
Cost of Goods and Services Sold, Total | 178,970 | 179,148 | 374,911 | 366,634 |
Insurance Settlements Receivable | 20,800 |  | 20,800 |  |
Loss from Catastrophes | 30,300 |  | 44,000 |  |
Unusual or Infrequent Item, or Both, Insurance Proceeds | 30,500 |  | 39,800 |  |
Proceeds from Insurance Settlement, Operating Activities | 19,000 |  | 20,800 |  |
Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  | 23,400 |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cumulative Effect on Retained Earnings, Tax |  |  | 200 |  |
Cumulative Effect on Retained Earnings, before Tax |  |  | 600 |  |
Noncontrolling Interest |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cumulative translation losses | 1,300 | 1,100 | 1,300 | 1,100 | 1,300
Educational Services |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Provision for Doubtful Accounts | 5,100 | 6,400 | 11,200 | 11,900 |
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 |  |
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 | 2.10% |  | 2.10% |  |
Adtalem Global Education Inc. |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Ownership interest of parent in subsidiary | 97.90% |  | 97.90% |  |
Cumulative translation losses | $ 59,800 | 50,000 | $ 59,800 | 50,000 | 58,100
Tax effect on unrealized gains on available-for-sale securities | 400 | 200 | 400 | 200 | 300
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax | $ 200 | $ 100 | $ 200 | $ 100 | $ 200

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