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Restructuring Charges - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended 48 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Restructuring And Related Activities [Abstract]      
Accrual for severance and related charges $ 0.6 $ 0.6 $ 2.1
Accrued retention bonuses $ 0.4 0.4  
Lease expiration teach out campuses 2021    
Charges related to remaining obligations for continuing operations   $ 78.7