Derivatives - Offsetting of Derivative Instruments (Detail) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Offsetting Assets [Line Items]
Gross amounts, assets	$ 115,173,000	$ 73,974,000
Gross amounts offset, assets	(104,754,000)	(71,095,000)
Net amounts presented in the statements of financial condition, assets	10,419,000	2,879,000
Gross amounts, liabilities	111,971,000	73,944,000
Gross amounts offset, liabilities	(104,754,000)	(71,095,000)
Net amounts presented in the statements of financial condition, liabilities	7,217,000	2,849,000
Additional balance in gross amounts not offset	0	0
FX swaps
Offsetting Assets [Line Items]
Gross amounts, assets	10,245,000	3,025,000
Gross amounts offset, assets	(663,000)	(538,000)
Net amounts presented in the statements of financial condition, assets	9,582,000	2,487,000
Gross amounts, liabilities	6,746,000	2,028,000
Gross amounts offset, liabilities	(663,000)	(538,000)
Net amounts presented in the statements of financial condition, liabilities	6,083,000	1,490,000
Forwards
Offsetting Assets [Line Items]
Gross amounts, assets	1,042,000	452,000
Gross amounts offset, assets	(205,000)	(60,000)
Net amounts presented in the statements of financial condition, assets	837,000	392,000
Gross amounts, liabilities	861,000	479,000
Gross amounts offset, liabilities	(205,000)	(60,000)
Net amounts presented in the statements of financial condition, liabilities	656,000	419,000
Futures
Offsetting Assets [Line Items]
Gross amounts, assets	103,886,000	70,497,000
Gross amounts offset, assets	(103,886,000)	(70,497,000)
Net amounts presented in the statements of financial condition, assets	0	0
Gross amounts, liabilities	104,364,000	71,437,000
Gross amounts offset, liabilities	(103,886,000)	(70,497,000)
Net amounts presented in the statements of financial condition, liabilities	$ 478,000	$ 940,000