Goodwill - Summary of Change in the Net Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 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	45,674
Adjustments to prior acquisitions	0
Balance at March 31, 2018	1,942,335
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	(699)
Adjustments to prior acquisitions	0
Balance at March 31, 2018	492,674
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	38,756
Adjustments to prior acquisitions	0
Balance at March 31, 2018	542,129
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	8,121
Adjustments to prior acquisitions	0
Balance at March 31, 2018	329,883
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 March 31, 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	(504)
Adjustments to prior acquisitions	0
Balance at March 31, 2018	116,909
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 March 31, 2018	$ 460,740

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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