Trading Activities - Summary of Transactions in Options Written (Detail)	12 Months Ended
	Dec. 31, 2021 USD ($) Contract
Summary Of Investment Holdings [Line Items]
Outstanding options, Premiums Received, beginning of year	$ 211,888
Outstanding options, Premiums Received, end of period	$ 0
Calls [Member]
Summary Of Investment Holdings [Line Items]
Options written, Contracts | Contract	5,460
Options exercised, Contracts | Contract	(90)
Options expired, Contracts | Contract	(4,800)
Options closed, Contracts | Contract	(570)
Options written, Notional	$ 6,124,786,000
Options exercised, Notional	(96,618,000)
Options expired, Notional	(5,385,760,000)
Options closed, Notional	(642,408,000)
Options written, Premiums Received	668,366
Options exercised, Premiums Received	(217,500)
Options expired, Premiums Received	(365,629)
Options closed, Premiums Received	$ (85,237)
Puts [Member]
Summary Of Investment Holdings [Line Items]
Outstanding options, Contracts, beginning of year | Contract	226
Options written, Contracts | Contract	50,798
Options exercised, Contracts | Contract	(529)
Options expired, Contracts | Contract	(42,566)
Options closed, Contracts | Contract	(7,929)
Outstanding options, Notional, beginning of year	$ 193,225,000
Options written, Notional	52,808,695,000
Options exercised, Notional	(554,534,000)
Options expired, Notional	(44,316,571,000)
Options closed, Notional	(8,130,815,000)
Outstanding options, Premiums Received, beginning of year	211,888
Options written, Premiums Received	15,136,942
Options exercised, Premiums Received	(533,706)
Options expired, Premiums Received	(11,398,804)
Options closed, Premiums Received	$ (3,416,320)