Derivatives - Fair Values of Derivatives Reported on Consolidated Statements of Financial Condition (Detail) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value		$ 14,783	$ 2,057
Derivative Assets, Notional		325,129	273,947
Derivative Liabilities, Fair Value		327,390	383,352
Derivative Liabilities, Notional		479,122	571,234
Derivative Assets, Fair Value, Total		14,554	922
Derivative Liabilities, Fair Value, Amounts not netted, Cash collateral	[1]		(2,476)
Derivative Liabilities, Fair Value, Amounts not netted, Securities collateral	[1]		(391)
Derivative Liabilities, Fair Value, Total		327,160	369,378
Total Return Swaps and Other [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value		13,427	1,052
Derivative Assets, Notional		155,026	20,888
Derivative Liabilities, Fair Value		72	13,709
Derivative Liabilities, Notional		1,398	83,706
Derivative Assets, Fair Value, Counterparty and cash collateral netting		(72)	(1,052)
Derivative Liabilities, Fair Value, Counterparty and cash collateral netting		(72)	(11,024)
Forward Foreign Currency Exchange Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value		1,356	1,005
Derivative Assets, Notional		170,103	253,059
Derivative Liabilities, Fair Value		921	761
Derivative Liabilities, Notional		128,098	174,550
Derivative Assets, Fair Value, Counterparty and cash collateral netting		(157)	(83)
Derivative Liabilities, Fair Value, Counterparty and cash collateral netting		(158)	(83)
LGAC Warrants [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value		115	10,005
Derivative Liabilities, Notional		11,500	11,500
LFI and Other Similar Deferred Compensation Arrangements [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value		326,282	358,877
Derivative Liabilities, Notional		338,126	301,478
Net derivatives in "other assets" and "other liabilities" [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value, Counterparty and cash collateral netting		14,554	922
Derivative Liabilities, Fair Value, Counterparty and cash collateral netting		$ 327,160	$ 372,245

[1] Amounts are subject to master netting arrangements but do not meet the criteria for netting on the consolidated statements of financial condition under U.S. GAAP. For some counterparties, the collateral amounts of securities and cash collateral pledged may exceed the derivative assets and derivative liabilities balances. Where this is the case, the total amount reported is limited to the net derivative assets and net derivative liabilities balances with that counterparty.