Receivables and Allowance for Doubtful Accounts - Schedule of Activity in Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Allowance For Doubtful Accounts Receivable Rollforward
Allowance for doubtful accounts receivables, Beginning balance		$ 33,957	$ 36,649
Bad debt expense, net of reversals		519	375
Charge-offs, foreign currency translation and other adjustments		(663)	(2,022)
Allowance for doubtful accounts receivables, Ending balance	[1]	$ 33,813	$ 35,002

[1] The allowance for doubtful accounts balances are substantially all related to M&A and Restructuring fee receivables that include reimbursable expense receivables.