Receivables and Allowance for Doubtful Accounts - Additional Information (Detail) - USD ($)	Mar. 31, 2022		Dec. 31, 2021	Mar. 31, 2021	[1]	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables	$ 110,321,000		$ 123,189,000
Allowance for doubtful accounts receivables	33,813,000	[1]	33,957,000	$ 35,002,000		$ 36,649,000
Customers and other	156,872,000		136,345,000
Aggregate carrying amount of other receivables	582,331,000		560,391,000
Customer and Other Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customers and other	123,988,000		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.