Trading Activities - Summary of Gross and Net Amounts Recognized Relating to Assets and Liabilities of Partnership's Derivatives (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Gross Amounts Recognized, Assets	$ 851,529	$ 710,148
Gross Amounts Offset in the Statements of Financial Condition, Assets	(757,896)	(522,665)
Amounts Presented in the Statements of Financial Condition, Assets	93,633	187,483
Financial Instruments, Assets	0	0
Cash Collateral Received/Pledged, Assets	0	0
Net Amount, Assets	93,633	187,483
Gross Amounts Recognized, Liabilities	(757,896)	(522,665)
Gross Amounts Offset in the Statements of Financial Condition, Liabilities	757,896	522,665
Amounts Presented in the Statements of Financial Condition, Liabilities	0	0
Financial Instruments, Liabilities	0	0
Cash Collateral Received/Pledged, Liabilities	0	0
Net Amount, Liabilities	0	0
Net Fair Value	93,633	187,483
Futures Contracts [Member]
Derivative [Line Items]
Gross Amounts Recognized, Assets	851,529	710,148
Gross Amounts Offset in the Statements of Financial Condition, Assets	(757,896)	(522,665)
Amounts Presented in the Statements of Financial Condition, Assets	93,633	187,483
Financial Instruments, Assets	0	0
Cash Collateral Received/Pledged, Assets	0	0
Net Amount, Assets	93,633	187,483
Gross Amounts Recognized, Liabilities	(757,896)	(522,665)
Gross Amounts Offset in the Statements of Financial Condition, Liabilities	757,896	522,665
Amounts Presented in the Statements of Financial Condition, Liabilities	0	0
Financial Instruments, Liabilities	0	0
Cash Collateral Received/Pledged, Liabilities	0	0
Net Amount, Liabilities	$ 0	$ 0