Partners' Capital, Mezzanine Equity and Distributions (Additional Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Partners Capital And Distributions [Line Items]
Cash or stock available for distributions, percent usually distributed	100.00%
Days to distribute	45 days
Accumulated distributions attributable to Class A Preferred Unitholders	$ 74,736	$ 74,467	$ 69,801
Class A | Partners' Capital
Partners Capital And Distributions [Line Items]
Common units outstanding (in units)	122,539,221
Class B | Partners' Capital
Partners Capital And Distributions [Line Items]
Common units outstanding (in units)	39,997
Class A Convertible Preferred Units
Partners Capital And Distributions [Line Items]
Convertible preferred units outstanding (in units)	25,336,778	25,336,778	24,438,022
Accumulated distributions attributable to Class A Preferred Unitholders	$ 74,700	$ 74,500	$ 69,800