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Derivatives - Summary of Gains and Losses on Derivative Contracts (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative contract	$ 4,792	$ 11,274
Forwards [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative contract	(113)	292
Futures [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative contract	4,248	5,908
Foreign Exchange/Commodities Options [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative contract	63	4,599
Foreign Exchange Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative contract	$ 594	378
Equity Options [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative contract		102
Interest Rate Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative contract		$ (5)

X

- 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=109980867&loc=SL5618551-113959

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+ References

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