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Discontinued Operations - Loss On Impairment of Assets (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) subsidiary institution | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of discontinued VIE institutions | institution | 7 |  |
Long-lived assets | $ 1,380,417 | $ 1,361,465 |
Loss on impairment of assets | 40,597 | 23,465 | $ 0
Impairments | 0 | 0 |
Discontinued Operations, Held-for-sale or Disposed of by Sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairments of long-lived assets | $ 33,476 | 23,465 | $ 0
Central America & U.S. Campuses | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of subsidiaries with impaired long-lived assets (subsidiary) | subsidiary | 2 |  |
Central America & U.S. Campuses | Tradenames |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairment of long-lived assets to be disposed of | $ 17,400 |  |
Rest of World |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Long-lived assets | 0 |  |
Loss on impairment of assets |  | 23,465 |
Impairments | 0 | 0 |
Rest of World | GERMANY |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairments |  | 4,163 |
Rest of World | Monash South Africa (MSA) |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairments |  | $ 19,302 |
Rest of World | Tradenames |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairment of long-lived assets to be disposed of | $ 16,100 |  |

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