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Subsequent Events - Additional Information (Detail)
$ in Millions, $ in Millions
Feb. 11, 2021
USD ($)
Feb. 11, 2021
SGD ($)
Apr. 14, 2021
USD ($)
Dec. 31, 2020
EduTech [Member]        
Subsequent Event [Line Items]        
Ownership interest in investment 76.09% 76.09%   77.78%
Additional acquired redeemable noncontrolling interest through contribution $ 0.8 $ 1.0    
EduTech [Member] | AEPL PTE. LTD. [Member]        
Subsequent Event [Line Items]        
Ownership interest in investment 23.91% 23.91%   22.22%
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Stock repurchase program, authorized amount     $ 20.0  
Purchase of common stock under share purchase program     $ 1.6