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Derivatives - Offsetting of Derivatives Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Offsetting Assets [Line Items]    
Gross Amounts, derivative assets $ 42,252 $ 4,448
Gross Amounts Offset, derivative assets (41,321) (2,580)
Net Amounts Presented in the Statements of Financial Condition, derivative assets 931 1,868
Gross Amounts, derivative liabilities 42,781 6,733
Gross Amounts Offset, derivative liabilities (41,321) (2,580)
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities 1,460 4,153
FX/Commodities Options [Member]    
Offsetting Assets [Line Items]    
Gross Amounts, derivative assets 74 26
Net Amounts Presented in the Statements of Financial Condition, derivative assets 74 26
FX Swaps [Member]    
Offsetting Assets [Line Items]    
Gross Amounts, derivative assets 583 1,672
Gross Amounts Offset, derivative assets (21) (394)
Net Amounts Presented in the Statements of Financial Condition, derivative assets 562 1,278
Gross Amounts, derivative liabilities 340 2,638
Gross Amounts Offset, derivative liabilities (21) (394)
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities 319 2,244
Forwards [Member]    
Offsetting Assets [Line Items]    
Gross Amounts, derivative assets 338 706
Gross Amounts Offset, derivative assets (43) (142)
Net Amounts Presented in the Statements of Financial Condition, derivative assets 295 564
Gross Amounts, derivative liabilities 258 1,427
Gross Amounts Offset, derivative liabilities (43) (142)
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities 215 1,285
Futures [Member]    
Offsetting Assets [Line Items]    
Gross Amounts, derivative assets 41,257 2,044
Gross Amounts Offset, derivative assets (41,257) (2,044)
Gross Amounts, derivative liabilities 42,183 2,668
Gross Amounts Offset, derivative liabilities (41,257) (2,044)
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities $ 926 $ 624