v3.26.1
Expense Example, No Redemption - MainGate MLP Fund - MainGate MLP Fund Class C
Mar. 31, 2026
USD ($)
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 248
Expense Example, No Redemption, 3 Years 764
Expense Example, No Redemption, 5 Years 1,306
Expense Example, No Redemption, 10 Years $ 2,786 [1]
[1] Class C shares automatically convert into Class A shares eight years after the purchase date. The 10-Year Expense Examples for Class C shares do not reflect the conversion to Class A shares after eight years.