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Goodwill - Summary of Change in the Net Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |
Goodwill |  | $ 2,051,420
Accumulated impairment loss |  | (96,754)
Goodwill [Roll Forward] |  |
Balance at December 31, 2017 | $ 1,954,666 |
Acquisitions | 0 |
Dispositions | 0 |
Reclassification to Long-term assets held for sale | (58,005) |
Impairments | 0 |
Currency translation adjustments | (77,655) |
Adjustments to prior acquisitions | 0 |
Balance at June 30, 2018 | 1,819,006 |
Brazil |  |
Goodwill [Line Items] |  |
Goodwill |  | 493,373
Accumulated impairment loss |  | 0
Goodwill [Roll Forward] |  |
Balance at December 31, 2017 | 493,373 |
Acquisitions | 0 |
Dispositions | 0 |
Reclassification to Long-term assets held for sale | 0 |
Impairments | 0 |
Currency translation adjustments | (59,159) |
Adjustments to prior acquisitions | 0 |
Balance at June 30, 2018 | 434,214 |
Mexico |  |
Goodwill [Line Items] |  |
Goodwill |  | 503,373
Accumulated impairment loss |  | 0
Goodwill [Roll Forward] |  |
Balance at December 31, 2017 | 503,373 |
Acquisitions | 0 |
Dispositions | 0 |
Reclassification to Long-term assets held for sale | 0 |
Impairments | 0 |
Currency translation adjustments | (5,308) |
Adjustments to prior acquisitions | 0 |
Balance at June 30, 2018 | 498,065 |
Andean & Iberian |  |
Goodwill [Line Items] |  |
Goodwill |  | 321,762
Accumulated impairment loss |  | 0
Goodwill [Roll Forward] |  |
Balance at December 31, 2017 | 321,762 |
Acquisitions | 0 |
Dispositions | 0 |
Reclassification to Long-term assets held for sale | 0 |
Impairments | 0 |
Currency translation adjustments | (7,143) |
Adjustments to prior acquisitions | 0 |
Balance at June 30, 2018 | 314,619 |
Central America & U.S. Campuses |  |
Goodwill [Line Items] |  |
Goodwill |  | 154,759
Accumulated impairment loss |  | (96,754)
Goodwill [Roll Forward] |  |
Balance at December 31, 2017 | 58,005 |
Acquisitions | 0 |
Dispositions | 0 |
Reclassification to Long-term assets held for sale | (58,005) |
Impairments | 0 |
Currency translation adjustments | 0 |
Adjustments to prior acquisitions | 0 |
Balance at June 30, 2018 | 0 |
EMEAA |  |
Goodwill [Line Items] |  |
Goodwill |  | 117,413
Accumulated impairment loss |  | 0
Goodwill [Roll Forward] |  |
Balance at December 31, 2017 | 117,413 |
Acquisitions | 0 |
Dispositions | 0 |
Reclassification to Long-term assets held for sale | 0 |
Impairments | 0 |
Currency translation adjustments | (6,045) |
Adjustments to prior acquisitions | 0 |
Balance at June 30, 2018 | 111,368 |
Online & Partnerships |  |
Goodwill [Line Items] |  |
Goodwill |  | 460,740
Accumulated impairment loss |  | $ 0
Goodwill [Roll Forward] |  |
Balance at December 31, 2017 | 460,740 |
Acquisitions | 0 |
Dispositions | 0 |
Reclassification to Long-term assets held for sale | 0 |
Impairments | 0 |
Currency translation adjustments | 0 |
Adjustments to prior acquisitions | 0 |
Balance at June 30, 2018 | $ 460,740 |

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