Partnership's Repurchase Activities (Detail) - $ / shares shares in Thousands		1 Months Ended	3 Months Ended	48 Months Ended
		Dec. 31, 2015	Dec. 31, 2015	Sep. 30, 2015		Nov. 30, 2015	Oct. 31, 2015
Capital Unit [Line Items]
Partnership's common units authorized for repurchase		6,044	6,044
Plan III Common Units Repurchase Program
Capital Unit [Line Items]
Partnership's common units authorized for repurchase		4,894	4,894
Total Number of Units Purchased	[1]	3	3	3,742	[2]
Average Price Paid per Unit	[3]	$ 7.02	$ 7.02	$ 4.72	[2]
Maximum Number of Units that May Yet Be Purchased		2,299	2,299	2,302	[2]	2,302	2,302
Private Transaction
Capital Unit [Line Items]
Partnership's common units authorized for repurchase		1,150	1,150	1,400

[1] Units were repurchased as part of a publicly announced program, except as noted in a private transaction.

[2] Includes 1.4 million common units acquired in a private transaction.

[3] Amounts include repurchase costs.