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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

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