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Restructuring Charges - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Restructuring Cost And Reserve [Line Items]    
Accrual for severance and related charges $ 11.5 $ 1.7
Long term amount $ 7.5 $ 1.0
Lease expiration teach out campuses 2023  
Accrued retention bonuses $ 1.8  
Charges related to remaining obligations 20.6  
Minimum [Member]    
Restructuring Cost And Reserve [Line Items]    
Gross remaining lease obligations 50.0  
Maximum [Member]    
Restructuring Cost And Reserve [Line Items]    
Gross remaining lease obligations $ 60.0