v3.26.1
Shareholder Fees - MainGate MLP Fund
Mar. 31, 2026
USD ($)
MainGate MLP Fund Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.75%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [1]
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) 0.00%
Exchange Fee $ 0
MainGate MLP Fund Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [1]
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) 0.00%
Exchange Fee $ 0
MainGate MLP Fund Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00% [1]
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) 0.00%
Exchange Fee $ 0
[1] Applies to Class A purchases of $1,000,000 or more where no sales charge was paid that are subsequently redeemed within 18 months of purchase and Class C purchases that are subsequently redeemed within 12 months of purchase.