Derivatives - Offsetting of Derivative Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Offsetting Assets [Line Items]
Gross amounts, assets	$ 47,552	$ 43,673
Gross amounts offset, assets	(46,259)	(38,289)
Net amounts presented in the statements of financial condition, assets	1,293	5,384
Gross amounts, liabilities	46,916	42,719
Gross amounts offset, liabilities	(46,259)	(38,289)
Net amounts presented in the statements of financial condition, liabilities	657	4,430
FX swaps
Offsetting Assets [Line Items]
Gross amounts, assets	1,231	5,993
Gross amounts offset, assets	(90)	(1,183)
Net amounts presented in the statements of financial condition, assets	1,141	4,810
Gross amounts, liabilities	544	4,862
Gross amounts offset, liabilities	(90)	(1,183)
Net amounts presented in the statements of financial condition, liabilities	454	3,679
Forwards
Offsetting Assets [Line Items]
Gross amounts, assets	124	465
Gross amounts offset, assets	(28)	(56)
Net amounts presented in the statements of financial condition, assets	96	409
Gross amounts, liabilities	188	807
Gross amounts offset, liabilities	(28)	(56)
Net amounts presented in the statements of financial condition, liabilities	160	751
Futures
Offsetting Assets [Line Items]
Gross amounts, assets	37,564	37,083
Gross amounts offset, assets	(37,564)	(36,918)
Net amounts presented in the statements of financial condition, assets	0	165
Gross amounts, liabilities	37,607	36,918
Gross amounts offset, liabilities	(37,564)	(36,918)
Net amounts presented in the statements of financial condition, liabilities	43	0
Interest rate swaps
Offsetting Assets [Line Items]
Gross amounts, assets	8,633	132
Gross amounts offset, assets	(8,577)	(132)
Net amounts presented in the statements of financial condition, assets	56	0
Gross amounts, liabilities	8,577	132
Gross amounts offset, liabilities	(8,577)	(132)
Net amounts presented in the statements of financial condition, liabilities	$ 0	$ 0