Common Unit Repurchase Plans and Retirement - Company's Repurchase Activities (Detail) - $ / shares shares in Thousands		1 Months Ended	3 Months Ended		12 Months Ended	120 Months Ended	131 Months Ended
		Oct. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	May 31, 2023	Nov. 30, 2023	[3]	Jun. 30, 2023	[2]
Repurchase Plan
Capital Unit [Line Items]
Total Number of Units Purchased			78	411	489	24,933	20,500
Average Price Paid per Unit	[1]		$ 11.2	$ 8.77	$ 9.16	$ 8.82
Maximum Number of Units that May Yet Be Purchased			1,068	1,146	2,568	1,557				2,568
Repurchase Plan | Subsequent Event
Capital Unit [Line Items]
Total Number of Units Purchased		13
Average Price Paid per Unit	[1]	$ 11.27
Maximum Number of Units that May Yet Be Purchased		2,555						2,555
Publicly Announced Plans or Programs As Part of Repurchase Plan
Capital Unit [Line Items]
Total Number of Units Purchased			78	411	489	20,045
Publicly Announced Plans or Programs As Part of Repurchase Plan | Subsequent Event
Capital Unit [Line Items]
Total Number of Units Purchased		13

[1] Amounts include repurchase costs.

[2] In May 2023, the Board authorized an increase in the number of Common Units available for repurchase in open market transactions from 0.8 million to 2.3 million.

[3] Of the total available for repurchase, approximately 2.3 million are available for repurchase in open market transactions and 0.3 million are available for repurchase in privately-negotiated transactions.