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Subsequent Events - Additional Information (Detail) - $ / shares
3 Months Ended
Apr. 23, 2021
Mar. 31, 2021
Mar. 31, 2020
Subsequent Event [Line Items]      
Distributions to unitholders - per unit/share   $ 0.4471 $ 0.4258
Subsequent Event | Class A Shares      
Subsequent Event [Line Items]      
Quarterly cash distribution declared date Apr. 23, 2021    
Quarterly cash distribution declared per Class A share $ 0.4526    
Distribution made to limited partner, increase in percentage than prior year quarter declared 1.20%    
Distribution made to limited partner, increase in percentage on an annualized basis 5.00%    
Distribution payable date May 13, 2021    
Record Date May 03, 2021    
Subsequent Event | Class B Shares      
Subsequent Event [Line Items]      
Distributions to unitholders - per unit/share $ 0.4526    
Units representing noncontrolling limited partner interests 259,516,928