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Partnership's Repurchase Activities (Detail) - $ / shares
shares in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 48 Months Ended
Mar. 31, 2016
Feb. 29, 2016
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Sep. 30, 2015
Jan. 31, 2016
Capital Unit [Line Items]              
Partnership's common units authorized for repurchase 6,044   6,044   6,044    
Private Transaction              
Capital Unit [Line Items]              
Partnership's common units authorized for repurchase 1,150   1,150   1,150 1,400  
Plan III Common Units Repurchase Program              
Capital Unit [Line Items]              
Partnership's common units authorized for repurchase 4,894   4,894   4,894    
Total Number of Units Purchased [1] 32 60 92 3 95 3,742 [2]  
Average Price Paid per Unit [3] $ 7.53 $ 7.47 $ 7.49 $ 7.02 $ 7.48 $ 4.72 [2]  
Maximum Number of Units that May Yet Be Purchased 2,207 2,239 2,207 2,299 2,207 2,302 [2] 2,299
[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.