Derivatives - Fair Values of Derivatives Reported on Condensed Consolidated Statements of Financial Condition (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Derivatives Fair Value [Line Items]
Derivative Assets, Fair Value	$ 20,849	$ 2,057
Derivative Assets, Notional	347,859	273,947
Derivative Liabilities, Fair Value	349,461	383,352
Derivative Liabilities, Notional	554,063	571,234
Derivative Assets, Fair Value, Counterparty and cash collateral netting	19,098	922
Derivative Assets, Fair Value, Total	19,098	922
Derivative Liabilities, Fair Value, Counterparty and cash collateral netting	349,211	372,245
Derivative Liabilities, Fair Value, Amounts not netted, Cash collateral		(2,476)
Derivative Liabilities, Fair Value, Total	349,211	369,378
Derivative Liabilities, Fair Value, Amounts not netted, Securities collateral		(391)
Forward Foreign Currency Exchange Rate Contracts [Member]
Derivatives Fair Value [Line Items]
Derivative Assets, Fair Value	2,337	1,005
Derivative Assets, Notional	200,572	253,059
Derivative Liabilities, Fair Value	690	761
Derivative Liabilities, Notional	172,454	174,550
Derivative Assets, Fair Value, Counterparty and cash collateral netting	(21)	(83)
Derivative Liabilities, Fair Value, Counterparty and cash collateral netting	(21)	(83)
Total Return Swaps and Other [Member]
Derivatives Fair Value [Line Items]
Derivative Assets, Fair Value	18,512	1,052
Derivative Assets, Notional	147,287	20,888
Derivative Liabilities, Fair Value	229	13,709
Derivative Liabilities, Notional	3,372	83,706
Derivative Assets, Fair Value, Counterparty and cash collateral netting	(1,730)	(1,052)
Derivative Liabilities, Fair Value, Counterparty and cash collateral netting	(229)	(11,024)
LGAC Warrants [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities, Fair Value	2,875	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	345,667	358,877
Derivative Liabilities, Notional	366,737	301,478
Derivative Liabilities, Fair Value, Counterparty and cash collateral netting	345,667	358,877
Total in "other assets" and "other liabilities" [Member]
Derivatives Fair Value [Line Items]
Derivative Assets, Fair Value, Counterparty and cash collateral netting	19,098	922
Derivative Liabilities, Fair Value, Counterparty and cash collateral netting	$ 349,211	$ 372,245