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Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Jul. 28, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020
Subsequent Event [Line Items] |  |  |  |  |
Distributions to unitholders - per unit/share |  | $ 0.4526 | $ 0.4471 | $ 0.4310 | $ 0.4258
Subsequent Event | Class A Shares |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Quarterly cash distribution declared date | Jul. 28, 2021 |  |  |  |
Quarterly cash distribution declared per Class A share | $ 0.5042 |  |  |  |
Distribution made to limited partner, increase in percentage than prior year quarter declared | 11.00% |  |  |  |
Distribution made to limited partner, announced increase in percentage than prior year quarter declared | 10.00% |  |  |  |
Distribution made to limited partner, increase in percentage on targeted annual distribution per share growth | 5.00% |  |  |  |
Distribution payable date | Aug. 13, 2021 |  |  |  |
Record Date | Aug. 09, 2021 |  |  |  |
Subsequent Event | Class B Shares |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Distributions to unitholders - per unit/share | $ 0.5042 |  |  |  |
Units representing noncontrolling limited partner interests | 259,516,928 |  |  |  |
Repurchase of shares | 31,000,000 |  |  |  |
Value of shares repurchased | $ 750.0 |  |  |  |
Percentage of stock repurchase, increased | 9.50% |  |  |  |
Stock purchased price per share | $ 24.00 |  |  |  |
Percentage of discount on purchase price per share | 4.00% |  |  |  |

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