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Summary of Impact of Derivative Financial Instruments to Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives and Commodity Contracts	$ 239,538	$ 91,325	$ (127,825)
Freestanding Derivatives
Derivative [Line Items]
Realized Gains (Losses)	8,222	(2,207)	(8,508)
Net Change in Unrealized Gains (Losses)	231,316	93,532	(119,317)
Freestanding Derivatives | Total Return Swaps
Derivative [Line Items]
Realized Gains (Losses)	1,654	(1,254)	(1,875)
Net Change in Unrealized Gains (Losses)	5,290	2,130	(1,683)
Freestanding Derivatives | Credit Default Swap
Derivative [Line Items]
Realized Gains (Losses)	(231)	(1,488)	(109)
Net Change in Unrealized Gains (Losses)	73	1,112	(1,777)
Freestanding Derivatives | Interest Rate Contracts
Derivative [Line Items]
Realized Gains (Losses)	15,319	1,727	(7,643)
Net Change in Unrealized Gains (Losses)	167,706	89,702	(117,145)
Freestanding Derivatives | Foreign Currency Contracts
Derivative [Line Items]
Realized Gains (Losses)	(8,520)	(1,152)	1,105
Net Change in Unrealized Gains (Losses)	9,666	608	1,231
Freestanding Derivatives | Equity Options
Derivative [Line Items]
Net Change in Unrealized Gains (Losses)	$ 48,581
Freestanding Derivatives | Other
Derivative [Line Items]
Realized Gains (Losses)		(40)	14
Net Change in Unrealized Gains (Losses)		$ (20)	$ 57

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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-Topic 230
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-Section 45
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