Derivatives - Offsetting of Derivative Instruments (Detail) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Offsetting Assets [Line Items]
Gross amounts, assets	$ 121,490,000	$ 73,974,000
Gross amounts offset, assets	(110,522,000)	(71,095,000)
Net amounts presented in the statements of financial condition, assets	10,968,000	2,879,000
Gross amounts, liabilities	118,649,000	73,944,000
Gross amounts offset, liabilities	(110,522,000)	(71,095,000)
Net amounts presented in the statements of financial condition, liabilities	8,127,000	2,849,000
Additional balance in gross amounts not offset	0	0
FX swaps
Offsetting Assets [Line Items]
Gross amounts, assets	13,257,000	3,025,000
Gross amounts offset, assets	(3,148,000)	(538,000)
Net amounts presented in the statements of financial condition, assets	10,109,000	2,487,000
Gross amounts, liabilities	10,658,000	2,028,000
Gross amounts offset, liabilities	(3,148,000)	(538,000)
Net amounts presented in the statements of financial condition, liabilities	7,510,000	1,490,000
Interest rate swaps
Offsetting Assets [Line Items]
Gross amounts, assets	483,000
Gross amounts offset, assets	(478,000)
Net amounts presented in the statements of financial condition, assets	5,000
Gross amounts, liabilities	478,000
Gross amounts offset, liabilities	(478,000)
Net amounts presented in the statements of financial condition, liabilities	0
Forwards
Offsetting Assets [Line Items]
Gross amounts, assets	29,000	452,000
Gross amounts offset, assets	(1,000)	(60,000)
Net amounts presented in the statements of financial condition, assets	28,000	392,000
Gross amounts, liabilities	618,000	479,000
Gross amounts offset, liabilities	(1,000)	(60,000)
Net amounts presented in the statements of financial condition, liabilities	617,000	419,000
Futures
Offsetting Assets [Line Items]
Gross amounts, assets	107,721,000	70,497,000
Gross amounts offset, assets	(106,895,000)	(70,497,000)
Net amounts presented in the statements of financial condition, assets	826,000	0
Gross amounts, liabilities	106,895,000	71,437,000
Gross amounts offset, liabilities	(106,895,000)	(70,497,000)
Net amounts presented in the statements of financial condition, liabilities	$ 0	$ 940,000