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Receivables and Allowance for Doubtful Accounts - Additional Information (Detail) - USD ($)
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
 [1]
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing receivables $ 120,334,000   $ 123,189,000      
Allowance for doubtful accounts receivables 30,271,000 [1] $ 33,813,000 33,957,000 $ 36,244,000 $ 35,002,000 $ 36,649,000
Customers and other 156,742,000   136,345,000      
Aggregate carrying amount of receivables excluding financing fees and customer loans 498,047,000   560,391,000      
Customer and Other Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Customers and other 121,321,000   122,229,000      
Financing Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for doubtful accounts receivables $ 0   $ 0      
[1] The allowance for doubtful accounts balances are substantially all related to M&A and Restructuring fee receivables that include reimbursable expense receivables.