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Acquisitions - Summary of Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Oct. 13, 2020
Business Acquisition [Line Items]      
Goodwill $ 58,043 $ 58,043  
Cisneros Interactive      
Business Acquisition [Line Items]      
Cash     $ 8,700
Accounts receivable     50,500
Other assets     6,200
Intangible assets subject to amortization     41,700
Goodwill     12,300
Current liabilities     (48,100)
Deferred tax     (10,600)
Redeemable noncontrolling interest     $ (30,800)