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Derivatives - Offsetting of Derivative Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Amounts, derivative assets |  | $ 43,504 | $ 4,448
Gross Amounts Offset, derivative assets |  | (42,609) | (2,580)
Net Amounts Presented in the Statements of Financial Condition, derivative assets | [1] | 895 | 1,868
Gross Amounts, derivative liabilities |  | 45,430 | 6,733
Gross Amounts Offset, derivative liabilities |  | (42,609) | (2,580)
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities | [1] | 2,821 | 4,153
FX/Commodities Options [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Amounts, derivative assets |  | 112 | 26
Gross Amounts Offset, derivative assets |  | (2) |
Net Amounts Presented in the Statements of Financial Condition, derivative assets | [1] | 110 | 26
Gross Amounts, derivative liabilities |  | 2 |
Gross Amounts Offset, derivative liabilities |  | (2) |
FX Swaps [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Amounts, derivative assets |  | 698 | 1,672
Gross Amounts Offset, derivative assets |  | (74) | (394)
Net Amounts Presented in the Statements of Financial Condition, derivative assets | [1] | 624 | 1,278
Gross Amounts, derivative liabilities |  | 389 | 2,638
Gross Amounts Offset, derivative liabilities |  | (74) | (394)
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities | [1] | 315 | 2,244
Forwards [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Amounts, derivative assets |  | 173 | 706
Gross Amounts Offset, derivative assets |  | (12) | (142)
Net Amounts Presented in the Statements of Financial Condition, derivative assets | [1] | 161 | 564
Gross Amounts, derivative liabilities |  | 1,901 | 1,427
Gross Amounts Offset, derivative liabilities |  | (12) | (142)
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities | [1] | 1,889 | 1,285
Futures [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Amounts, derivative assets |  | 42,521 | 2,044
Gross Amounts Offset, derivative assets |  | (42,521) | (2,044)
Gross Amounts, derivative liabilities |  | 43,138 | 2,668
Gross Amounts Offset, derivative liabilities |  | (42,521) | (2,044)
Net Amounts Presented in the Statements of Financial Condition, derivative liabilities | [1] | $ 617 | $ 624
[1] | There were no additional balances in gross amounts not offset as of June 30, 2020 and December 31, 2019, respectively.

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