Common Unit Repurchase and Retirement - Company's Repurchase Activities (Detail) - $ / shares shares in Thousands		1 Months Ended						3 Months Ended			131 Months Ended	144 Months Ended
		Jul. 31, 2025		Jun. 30, 2025	May 31, 2025		Apr. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	May 31, 2023	Sep. 30, 2024
Repurchase Plan
Capital Unit [Line Items]
Total Number of Units Purchased		144		108	708		1	817	6	13	20,500	26,438
Average Price Paid per Unit	[1]	$ 11.87		$ 11.83	$ 12.04		$ 12.03	$ 12.01	$ 11.24	$ 11.2		$ 8.9
Maximum Number of Units that May Yet Be Purchased		1,272	[2]	1,416	1,524	[3]	1,532	1,416	1,533	1,539		1,552
Repurchase Plan | Subsequent Event
Capital Unit [Line Items]
Total Number of Units Purchased		100
Average Price Paid per Unit		$ 11.87
Publicly Announced Plans or Programs As Part of Repurchase Plan
Capital Unit [Line Items]
Total Number of Units Purchased		144		108	8		1	117	6	13		21,550

[1] Amount includes repurchase costs.

[2] Of the total available for repurchase, approximately 1.0 million units are available for repurchase in open market transactions and approximately 0.3 million units are available for repurchase in privately-negotiated transactions, under the Repurchase Plan.

[3] The total number of units purchased includes 0.7 million of common units acquired in a private transaction.