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Allowance for Credit Losses - Schedule of Allowance for Credit Losses Activity Included in Accounts Receivable Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance For Credit Loss [Abstract]      
Balance, beginning of year $ 1,469 $ 1,392 $ 763
Adoption of ASU 2016-13 1,069    
Allowance for Data Masons acquired receivables 354    
Provision for credit losses 5,660 3,499 2,592
Write-offs, net of recoveries (4,319) (3,422) (1,963)
Balance, end of year $ 4,233 $ 1,469 $ 1,392