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Quarterly Financial Summary (Unaudited) - Schedule of Quarterly Financial Summary (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Quarterly Financial Summary [Line Items]
Tax expense related to impact of enacted tax cuts and jobs act during period	$ 52,700
Asset impairment charges				$ 1,164	$ 60,515
Unused space charges		$ 22,500
Discontinued Operations Remainder Relating to All Other Campuses Segment [Member]
Schedule Of Quarterly Financial Summary [Line Items]
Unused space charges		4,200
All Other Campuses [Member]
Schedule Of Quarterly Financial Summary [Line Items]
Legal settlements charge	$ 6,500		$ 6,500
Asset impairment charges		900			$ 41,200
University Group [Member] | AIU [Member]
Schedule Of Quarterly Financial Summary [Line Items]
Legal settlements charge		$ 32,000		$ 32,000

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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