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Divestitures - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2020
Apr. 30, 2020
Feb. 14, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]                
Proceeds from divestitures of businesses $ 20,000 $ 3,300         $ 21,460 $ 0
Purchase price of agreement     $ 12,900          
Proceeds from sale of business     10,000          
QuinStreet Brasil Online Marketing e Midia Ltda ("QSB") and VEMM, LLC ("VEMM") | Euro-Demand Do Brasil Serviços de Geração de Leads Ltda (“EDB”)                
Restructuring Cost And Reserve [Line Items]                
Proceeds from sale of business           $ 1,100    
Secured Promissory Note                
Restructuring Cost And Reserve [Line Items]                
Secured promissory note, receivable     $ 2,900          
Other Income (Expense)                
Restructuring Cost And Reserve [Line Items]                
Gain (loss) on disposition of operation       $ 16,600 $ 2,800 $ 12,000