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Partnership's Repurchase Activities (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2013
Aug. 31, 2013
Jul. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Sep. 30, 2012
Capital Unit [Line Items]                  
Partnership's common units authorized for repurchase in a private transaction 1,150 [1]     1,150 [1] 1,150     1,150 [1]  
Maximum Number of Units that May Yet Be Purchased Under the Program Plan III and Private Transaction Beginning Total 6,044     6,044       6,044  
Plan III Common Units Repurchase Program
                  
Capital Unit [Line Items]                  
Plan III partnership's common units authorized for repurchase 4,894     4,894       4,894  
Total Number of Units Purchased as Part of a Publicly Announced Plan or Program 142 120   262 1,697 [1] 310 1,015 3,284 22
Average Price Paid per Unit $ 4.84 [2] $ 4.87 [2]    [2] $ 4.85 [2] $ 4.92 [1],[2] $ 4.36 [2] $ 4.18 [2] $ 4.63 [2] $ 4.26 [2]
Maximum Number of Units that May Yet Be Purchased Under the Program 2,738 2,880 3,000 2,738 3,000 [1] 4,697 5,007 2,738 6,022
[1] Third quarter fiscal 2013 common unit repurchases include 1.15 million common units acquired in a private transaction.
[2] Amounts include repurchase costs.