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Restructuring Charges - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Restructuring Cost and Reserve [Line Items]      
Accrual for severance and related charges $ 8.7 $ 8.7 $ 1.4
Long term amount 3.9 3.9 $ 1.0
Accrued retention bonuses 0.9 0.9  
Amount recorded ratably over the period retained 0.6    
Current lease obligations 2.2 $ 2.2  
Lease expiration teach out campuses   2023  
Minimum [Member]      
Restructuring Cost and Reserve [Line Items]      
Gross remaining lease obligations 32.0 $ 32.0  
Maximum [Member]      
Restructuring Cost and Reserve [Line Items]      
Gross remaining lease obligations $ 37.0 $ 37.0