Partners' Capital and Distributions - Schedule of Distributions Declared and Paid (Detail)	12 Months Ended
	Dec. 31, 2019 $ / shares
First Quarter 2018
Distribution Made To Limited Partner [Line Items]
Record Date	May 04, 2018
Distribution Date	May 14, 2018
Distribution per Common and Subordinated Unit/Class A Share	$ 0.3333
Second Quarter 2018
Distribution Made To Limited Partner [Line Items]
Record Date	Aug. 02, 2018
Distribution Date	Aug. 13, 2018
Distribution per Common and Subordinated Unit/Class A Share	$ 0.3452
Third Quarter 2018
Distribution Made To Limited Partner [Line Items]
Record Date	Nov. 05, 2018
Distribution Date	Nov. 13, 2018
Distribution per Common and Subordinated Unit/Class A Share	$ 0.3575
Fourth Quarter 2018
Distribution Made To Limited Partner [Line Items]
Record Date	Feb. 04, 2019
Distribution Date	Feb. 13, 2019
Distribution per Common and Subordinated Unit/Class A Share	$ 0.3701
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	[1]
Distribution Date	Feb. 14, 2020	[1]
Distribution per Common and Subordinated Unit/Class A Share	$ 0.4258	[1]

[1] For more information, see Note 16, Subsequent Events.