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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

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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