Common Unit Repurchase and Retirement - Additional Information (Detail) - USD ($) shares in Thousands		1 Months Ended				3 Months Ended			84 Months Ended	94 Months Ended
	Dec. 04, 2019	Jul. 31, 2020	Jun. 30, 2020	May 31, 2020	Apr. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Apr. 30, 2020	Feb. 29, 2020	Jan. 31, 2020
Capital Unit [Line Items]
Company's common units authorized for repurchase				3,600	100					100	1,100	100
Fifth Amendment
Capital Unit [Line Items]
Availability required to repurchase common units	$ 45,000,000
Percentage of the maximum facility size on a historical proforma and forward-looking basis	15.00%
Non Seasonal maximum borrowing capacity under revolving credit facility	$ 300,000,000
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units	115.00%
Repurchase Plan
Capital Unit [Line Items]
Company's common units repurchased and retired			625	106	424	1,155	782	1,281	13,340	12,800
Repurchase Plan | Subsequent Event
Capital Unit [Line Items]
Company's common units repurchased and retired		725
Common Stock Available for Repurchase Under Privately Negotiated Transactions
Capital Unit [Line Items]
Company's common units authorized for repurchase				1,100
Common Stock Available for Repurchase Under Privately Negotiated Transactions | Subsequent Event
Capital Unit [Line Items]
Company's common units authorized for repurchase		1,100
Common Stock Available for Repurchase Under Open Market Transactions
Capital Unit [Line Items]
Company's common units authorized for repurchase				2,500
Common Stock Available for Repurchase Under Open Market Transactions | Subsequent Event
Capital Unit [Line Items]
Company's common units authorized for repurchase		1,000
Common Stock Repurchase Under Open Market Transactions
Capital Unit [Line Items]
Company's common units repurchased and retired						1,200