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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, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule Of Quarterly Financial Summary [Line Items] |  |  |  |  |  |  |  |
Asset impairment charges |  | $ 9,700 |  |  |  | $ 1,164 | $ 60,515 | $ 36,141
Unused space charges | $ 22,500 |  |  |  |  |  |  |
Valuation allowances against deferred tax assets |  | 109,800 |  |  |  |  | 109,800 |
Discontinued Operations Remainder Related to Teach-Out Segments [Member] |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Summary [Line Items] |  |  |  |  |  |  |  |
Unused space charges | 4,200 |  |  |  |  |  |  |
University Group [Member] | AIU [Member] |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Summary [Line Items] |  |  |  |  |  |  |  |
Legal settlements charge | 32,000 |  |  |  |  | $ 32,000 |  |
Culinary Arts [Member] |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Summary [Line Items] |  |  |  |  |  |  |  |
Asset impairment charges | 400 | $ 9,000 | $ 33,400 | $ 9,700 |  |  | 35,100 | 10,300
Transitional Group [Member] |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Summary [Line Items] |  |  |  |  |  |  |  |
Asset impairment charges | $ 500 |  |  | $ 1,700 | $ 6,000 |  | $ 6,100 | $ 14,500

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