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Business Acquisition - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Mar. 02, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill $ 118,312,000   $ 87,356,000 $ 87,356,000
Trident [Member]        
Business Acquisition [Line Items]        
Purchase price 43,800,000      
Purchase price including subsequent cash payment   $ 43,819,000    
Faiir values of acquired tangible and identifiable intangible assets   53,136,000    
Fair values of assumed liabilities   9,317,000    
Goodwill   30,956,000    
Trident [Member] | Trade Name [Member]        
Business Acquisition [Line Items]        
Fair value of intangible assets   1,000,000    
Trident [Member] | Student Relationships and Course Curriculum [Member]        
Business Acquisition [Line Items]        
Fair value of intangible assets   $ 9,400,000    
Trident [Member] | Restricted Cash [Member]        
Business Acquisition [Line Items]        
Amount set aside in escrow account $ 4,000,000.0   $ 0