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Receivables and Allowance for Doubtful Accounts - Schedule of Activity in Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Allowance For Doubtful Accounts Receivable Rollforward        
Allowance for doubtful accounts receivables, Beginning balance $ 33,813 $ 35,002 $ 33,957 $ 36,649
Bad debt expense (credit), net of reversals (1,061) 2,169 (542) 2,544
Charge-offs, foreign currency translation and other adjustments (2,481) (927) (3,144) (2,949)
Allowance for doubtful accounts receivables, Ending balance [1] $ 30,271 $ 36,244 $ 30,271 $ 36,244
[1] The allowance for doubtful accounts balances are substantially all related to M&A and Restructuring fee receivables that include reimbursable expense receivables.