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Derivatives - Offsetting of Derivative Instruments (Detail) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Offsetting Assets [Line Items]    
Gross amounts, assets $ 140,963,000 $ 70,033,000
Gross amounts offset, assets (136,620,000) (66,271,000)
Net amounts presented in the statements of financial condition, assets 4,343,000 3,762,000
Gross amounts, liabilities 141,555,000 73,904,000
Gross amounts offset, liabilities (136,620,000) (66,271,000)
Net amounts presented in the statements of financial condition, liabilities 4,935,000 7,633,000
Additional balance in gross amounts not offset 0 0
FX swaps    
Offsetting Assets [Line Items]    
Gross amounts, assets 3,214,000 3,623,000
Gross amounts offset, assets (376,000) (489,000)
Net amounts presented in the statements of financial condition, assets 2,838,000 3,134,000
Gross amounts, liabilities 4,277,000 6,285,000
Gross amounts offset, liabilities (376,000) (489,000)
Net amounts presented in the statements of financial condition, liabilities 3,901,000 5,796,000
Interest rate swaps    
Offsetting Assets [Line Items]    
Gross amounts, assets 66,637,000 895,000
Gross amounts offset, assets (66,090,000) (870,000)
Net amounts presented in the statements of financial condition, assets 547,000 25,000
Gross amounts, liabilities 66,090,000 870,000
Gross amounts offset, liabilities (66,090,000) (870,000)
Net amounts presented in the statements of financial condition, liabilities 0 0
Forwards    
Offsetting Assets [Line Items]    
Gross amounts, assets 375,000 746,000
Gross amounts offset, assets (101,000) (143,000)
Net amounts presented in the statements of financial condition, assets 274,000 603,000
Gross amounts, liabilities 1,135,000 712,000
Gross amounts offset, liabilities (101,000) (143,000)
Net amounts presented in the statements of financial condition, liabilities 1,034,000 569,000
Futures    
Offsetting Assets [Line Items]    
Gross amounts, assets 70,737,000 64,769,000
Gross amounts offset, assets (70,053,000) (64,769,000)
Net amounts presented in the statements of financial condition, assets 684,000 0
Gross amounts, liabilities 70,053,000 66,037,000
Gross amounts offset, liabilities (70,053,000) (64,769,000)
Net amounts presented in the statements of financial condition, liabilities $ 0 $ 1,268,000