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Partnership's Repurchase Activities (Detail) - $ / shares
shares in Thousands
 3 Months Ended 9 Months Ended 48 Months Ended
Dec. 31, 2015
Mar. 31, 2015
Jun. 30, 2016
Sep. 30, 2015
Capital Unit [Line Items]        
Partnership's common units authorized for repurchase     6,044  
Private Transaction        
Capital Unit [Line Items]        
Partnership's common units authorized for repurchase     1,150 1,400
Plan III Common Units Repurchase Program        
Capital Unit [Line Items]        
Partnership's common units authorized for repurchase     4,894  
Total Number of Units Purchased [1] 3 92 95 3,742 [2]
Average Price Paid per Unit [3] $ 7.02 $ 7.49 $ 7.48 $ 4.72 [2]
Maximum Number of Units that May Yet Be Purchased 2,299 2,207 2,207 2,302 [2]
[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.