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Segment Reporting - Summary Financial Information by Reporting Segment (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
Segment Reporting Information [Line Items]          
Asset impairment charge       $ 1,164 $ 60,515
All Other Campuses [Member]          
Segment Reporting Information [Line Items]          
Asset impairment charge   $ 900     41,200
Trade name and asset impairment charges         $ 18,800
Legal settlements charge $ 6,500   $ 6,500    
Charge related to remaining lease obligations     $ 14,800 31,000  
University Group [Member] | AIU [Member]          
Segment Reporting Information [Line Items]          
Legal settlements charge   $ 32,000   $ 32,000