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Schedule V - Valuation and Qualifying Accounts (Detail) - Allowance for doubtful accounts - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning Balance $ 631 $ 749 $ 711
Charges to Earnings 466 528 456
Deductions 513 646 418
Ending Balance $ 584 $ 631 $ 749