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	$ 3,472,614	$ 1,522,451
Gross Amounts Offset in the Statements of Financial Condition, Assets	(1,283,605)	(797,089)
Amounts Presented in the Statements of Financial Condition, Assets	2,189,009	725,362
Financial Instruments, Assets	0	0
Cash Collateral Received/Pledged, Assets	0	0
Net Amount, Assets	2,189,009	725,362
Gross Amounts Recognized, Liabilities	(1,283,605)	(797,089)
Gross Amounts Offset in the Statements of Financial Condition, Liabilities	1,283,605	797,089
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	2,189,009	725,362
Futures Contracts [Member]
Derivative [Line Items]
Gross Amounts Recognized, Assets	2,636,639	1,027,835
Gross Amounts Offset in the Statements of Financial Condition, Assets	(664,769)	(471,939)
Amounts Presented in the Statements of Financial Condition, Assets	1,971,870	555,896
Financial Instruments, Assets	0	0
Cash Collateral Received/Pledged, Assets	0	0
Net Amount, Assets	1,971,870	555,896
Gross Amounts Recognized, Liabilities	(664,769)	(471,939)
Gross Amounts Offset in the Statements of Financial Condition, Liabilities	664,769	471,939
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
Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts Recognized, Assets	835,975	494,616
Gross Amounts Offset in the Statements of Financial Condition, Assets	(618,836)	(325,150)
Amounts Presented in the Statements of Financial Condition, Assets	217,139	169,466
Financial Instruments, Assets	0	0
Cash Collateral Received/Pledged, Assets	0	0
Net Amount, Assets	217,139	169,466
Gross Amounts Recognized, Liabilities	(618,836)	(325,150)
Gross Amounts Offset in the Statements of Financial Condition, Liabilities	618,836	325,150
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