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Restructuring Charges - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost And Reserve [Line Items]    
Accrual for severance and related charges $ 7.3 $ 11.5
Long term amount 1.4 $ 7.5
Accrued retention bonuses $ 1.4  
Lease expiration teach out campuses 2023  
Charges related to remaining obligations $ 32.4  
Minimum [Member]    
Restructuring Cost And Reserve [Line Items]    
Gross remaining lease obligations 20.0  
Maximum [Member]    
Restructuring Cost And Reserve [Line Items]    
Gross remaining lease obligations $ 30.0