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Restructuring Charges - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Campus
Jun. 30, 2014
Campus
Jun. 30, 2013
Restructuring And Related Activities [Abstract]      
Accrual for severance and related charges $ 1.6 $ 1.6 $ 2.6
Long term amount 1.0 1.0 1.4
Accrued retention bonuses 1.1 1.1  
Amount recorded ratably over the period retained 0.4    
Number of campuses completed teach out activities 8 8  
Number of campuses remaining lease obligation 8 8  
Net present value of remaining lease obligation 6.1 6.1  
Gross remaining lease obligations $ 12 $ 12  
Lease expiration teach out campuses   2021