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Derivatives - Summary of Gains and (Losses) on Derivative Contracts (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (loss), net on derivative contract | $ 3,072 | $ 3,253 | $ 4,859 | $ 8,044
FX/Commodities Options [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (loss), net on derivative contract | 143 | 49 | 198 | 112
FX Swaps [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (loss), net on derivative contract | 89 | 631 | 325 | 1,224
Equity Options [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (loss), net on derivative contract |  | 318 |  | 318
Futures [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (loss), net on derivative contract | 2,724 | 4,561 | 5,488 | 8,809
Forwards [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (loss), net on derivative contract | $ 116 | $ (2,306) | $ (1,152) | $ (2,419)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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