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Revenue Recognition - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Revenue Recognition [Line Items]          
Length of academic year     210 days    
Revenue recognized estimated reserve based on historical evidence $ 2.4   $ 2.4   $ 2.1
Decrease in revenue $ 5.6   $ 14.1    
Percentage of decrease in revenue 3.20%   2.60%    
ASC Topic 606 [Member]          
Revenue Recognition [Line Items]          
Revenue recognized for payments received from withdrawn students $ 0.4 $ 0.3 $ 1.1 $ 1.2  
Minimum [Member]          
Revenue Recognition [Line Items]          
Length of academic terms     56 days    
Maximum [Member]          
Revenue Recognition [Line Items]          
Length of academic terms     84 days    
Online Courses [Member] | Minimum [Member]          
Revenue Recognition [Line Items]          
Length of Non-Degree Professional Programs     84 days    
Online Courses [Member] | Maximum [Member]          
Revenue Recognition [Line Items]          
Length of Non-Degree Professional Programs     126 days    
Subscription Based Access [Member] | Maximum [Member]          
Revenue Recognition [Line Items]          
Length of Non-Degree Professional Programs     364 days