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Restructuring Charges - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Campus
Sep. 30, 2014
Campus
Sep. 30, 2013
Restructuring and Related Activities [Abstract]      
Accrual for severance and related charges $ 4.5 $ 4.5 $ 2.1
Long term amount 1.2 1.2 1.4
Accrued retention bonuses 0.8 0.8  
Amount recorded ratably over the period retained 0.2    
Number of campuses completed teach out activities 3 3  
Number of campuses remaining lease obligation 3 3  
Net present value of remaining lease obligation 1.0 1.0  
Gross remaining lease obligations $ 14 $ 14  
Lease expiration teach out campuses   2021