Common Unit Repurchase and Retirement - Company's Repurchase Activities (Detail) - $ / shares shares in Thousands		1 Months Ended				3 Months Ended		131 Months Ended	132 Months Ended
		Apr. 30, 2024	Mar. 31, 2024	Feb. 29, 2024	Jan. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	May 31, 2023	Sep. 30, 2023
Repurchase Plan
Capital Unit [Line Items]
Total Number of Units Purchased			113	90	15	218	13	20,500	25,422
Average Price Paid per Unit	[1]		$ 10.78	$ 11.03	$ 11.27	$ 10.92	$ 11.27		$ 8.82
Maximum Number of Units that May Yet Be Purchased			2,337	2,450	2,540	2,337	2,555		2,568
Repurchase Plan | Subsequent Event
Capital Unit [Line Items]
Total Number of Units Purchased		141
Average Price Paid per Unit	[1]	$ 10.58
Maximum Number of Units that May Yet Be Purchased	[2]	2,196
Publicly Announced Plans or Programs As Part of Repurchase Plan
Capital Unit [Line Items]
Total Number of Units Purchased			113	90	15	218	13		20,534
Publicly Announced Plans or Programs As Part of Repurchase Plan | Subsequent Event
Capital Unit [Line Items]
Total Number of Units Purchased		141

[1] Amount includes repurchase costs.

[2] Of the total available for repurchase, approximately 1.9 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.