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Derivatives - Offsetting of Derivative Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Amounts, derivative assets |  | $ 76,346 | $ 4,448
Gross Amounts Offset, derivative assets |  | (75,154) | (2,580)
Net Amounts Presented in the Statements of Financial Condition, derivative assets | [1] | 1,192 | 1,868
Gross Amounts, derivative liabilities |  | 79,251 | 6,733
Gross Amounts Offset, derivative liabilities |  | (75,154) | (2,580)
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities | [1] | 4,097 | 4,153
FX/Commodities Options [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Amounts, derivative assets |  |  | 26
Net Amounts Presented in the Statements of Financial Condition, derivative assets | [1] |  | 26
Gross Amounts, derivative liabilities |  | 59 |
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities | [1] | 59 |
FX Swaps [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Amounts, derivative assets |  | 1,221 | 1,672
Gross Amounts Offset, derivative assets |  | (174) | (394)
Net Amounts Presented in the Statements of Financial Condition, derivative assets | [1] | 1,047 | 1,278
Gross Amounts, derivative liabilities |  | 1,192 | 2,638
Gross Amounts Offset, derivative liabilities |  | (174) | (394)
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities | [1] | 1,018 | 2,244
Forwards [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Amounts, derivative assets |  | 151 | 706
Gross Amounts Offset, derivative assets |  | (6) | (142)
Net Amounts Presented in the Statements of Financial Condition, derivative assets | [1] | 145 | 564
Gross Amounts, derivative liabilities |  | 2,437 | 1,427
Gross Amounts Offset, derivative liabilities |  | (6) | (142)
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities | [1] | 2,431 | 1,285
Futures [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Amounts, derivative assets |  | 74,974 | 2,044
Gross Amounts Offset, derivative assets |  | (74,974) | (2,044)
Gross Amounts, derivative liabilities |  | 75,563 | 2,668
Gross Amounts Offset, derivative liabilities |  | (74,974) | (2,044)
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities | [1] | $ 589 | $ 624
[1] | There were no additional balances in gross amounts not offset as of March 31, 2020 and December 31, 2019, respectively.

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