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Restructuring Charges - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Restructuring Cost And Reserve [Line Items]    
Accrual for severance and related charges $ 7.8 $ 1.6
Long term amount 6.6 $ 1.0
Accrued retention bonuses $ 1.8  
Lease expiration teach out campuses 2023  
Charges related to remaining obligations $ 23.6  
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