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Restructuring Charges - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]    
Accrual for severance and related charges $ 3.0 $ 7.3
Long term amount 0.3 $ 1.4
Accrued retention bonuses $ 1.4  
Lease expiration teach out campuses 2023  
Charges related to remaining obligations for continuing operations $ 67.5  
Minimum [Member]    
Restructuring Cost And Reserve [Line Items]    
Gross remaining lease obligations 4.0  
Maximum [Member]    
Restructuring Cost And Reserve [Line Items]    
Gross remaining lease obligations $ 6.0