Trading Activities - Summary of Valuation of Partnership's Investments (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Gross Amounts Recognized, Assets	$ 211,200	$ 621,000
Gross Amounts Offset in the Statement of Financial Condition, Assets	0	0
Amounts Presented in the Statement of Financial Condition, Assets	211,200	621,000
Financial Instruments, Assets	(209,000)	(699,200)
Cash Collateral, Assets	0	0
Net Amount, Assets	2,200	(78,200)
Gross Amounts Recognized, Liabilities	(209,000)	(699,200)
Gross Amounts Offset in the Statement of Financial Condition, Liabilities	0	0
Amounts Presented in the Statement of Financial Condition, Liabilities	(209,000)	(699,200)
Financial Instruments, Liabilities	209,000	699,200
Cash Collateral, Liabilities	0	0
Net Amount, Liabilities	0	0
Net fair value	2,200	(78,200)
Options Purchased [Member]
Derivative [Line Items]
Gross Amounts Recognized, Assets	211,200	621,000
Gross Amounts Offset in the Statement of Financial Condition, Assets	0	0
Amounts Presented in the Statement of Financial Condition, Assets	211,200	621,000
Financial Instruments, Assets	(209,000)	(699,200)
Cash Collateral, Assets	0	0
Net Amount, Assets	2,200	(78,200)
Written Options [Member]
Derivative [Line Items]
Gross Amounts Recognized, Liabilities	(209,000)	(699,200)
Gross Amounts Offset in the Statement of Financial Condition, Liabilities	0	0
Amounts Presented in the Statement of Financial Condition, Liabilities	(209,000)	(699,200)
Financial Instruments, Liabilities	209,000	699,200
Cash Collateral, Liabilities	0	0
Net Amount, Liabilities	$ 0	$ 0