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Partners' Capital and Distributions - Schedule of Distributions Declared and Paid (Detail) | 9 Months Ended
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Sep. 30, 2020 $ / shares
First Quarter 2019 |  |
Distribution Made To Limited Partner [Line Items] |  |
Record Date | May 03, 2019 |
Distribution Date | May 14, 2019 |
Distribution per Common and Subordinated Unit/Class A share | $ 0.3833 |
Second Quarter 2019 |  |
Distribution Made To Limited Partner [Line Items] |  |
Record Date | Aug. 05, 2019 |
Distribution Date | Aug. 13, 2019 |
Distribution per Common and Subordinated Unit/Class A share | $ 0.3970 |
Third Quarter 2019 |  |
Distribution Made To Limited Partner [Line Items] |  |
Record Date | Nov. 04, 2019 |
Distribution Date | Nov. 13, 2019 |
Distribution per Common and Subordinated Unit/Class A share | $ 0.4112 |
Fourth Quarter 2019 |  |
Distribution Made To Limited Partner [Line Items] |  |
Record Date | Feb. 06, 2020 |
Distribution Date | Feb. 14, 2020 |
Distribution per Common and Subordinated Unit/Class A share | $ 0.4258 |
First Quarter 2020 |  |
Distribution Made To Limited Partner [Line Items] |  |
Record Date | May 04, 2020 |
Distribution Date | May 14, 2020 |
Distribution per Common and Subordinated Unit/Class A share | $ 0.4310 |
Second Quarter 2020 |  |
Distribution Made To Limited Partner [Line Items] |  |
Record Date | Aug. 06, 2020 |
Distribution Date | Aug. 14, 2020 |
Distribution per Common and Subordinated Unit/Class A share | $ 0.4363 |
Third Quarter 2020 |  |
Distribution Made To Limited Partner [Line Items] |  |
Record Date | Nov. 05, 2020 | [1]
Distribution Date | Nov. 13, 2020 | [1]
Distribution per Common and Subordinated Unit/Class A share | $ 0.4417 | [1]
[1] | For more information, see Note 14, Subsequent Events.

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