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Business Acquisition - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended
Mar. 02, 2020
Jul. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill     $ 118,312 $ 87,356
Trident [Member]        
Business Acquisition [Line Items]        
Purchase price $ 38,100 $ 5,700    
Purchase price including subsequent cash payment 43,819      
Faiir values of acquired tangible and identifiable intangible assets 53,136      
Fair values of assumed liabilities 9,317      
Goodwill 30,956      
Trident [Member] | Trade Name [Member]        
Business Acquisition [Line Items]        
Fair value of intangible assets 1,000      
Trident [Member] | Student Relationships and Course Curriculum [Member]        
Business Acquisition [Line Items]        
Fair value of intangible assets 9,400      
Trident [Member] | Restricted Cash [Member]        
Business Acquisition [Line Items]        
Amount set aside in escrow account $ 4,000