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Summary of Significant Accounting Policies - Rollforward of Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Rollforward of allowance for doubtful accounts      
Beginning Balance $ 5,774 $ 5,936 $ 6,195
Additions 20,451 4,720 5,811
Deductions (write-offs, net of recoveries) (4,464) (4,882) (6,070)
Ending Balance $ 21,761 $ 5,774 $ 5,936