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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 9 Months Ended 12 Months Ended
Jun. 30, 2013
May 31, 2013
Apr. 30, 2013
Mar. 31, 2013
Jan. 31, 2013
Dec. 31, 2012
Nov. 30, 2012
Oct. 31, 2012
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Sep. 30, 2012
Feb. 28, 2013
Jul. 31, 2012
Capital Unit [Line Items]                              
Number of Units that May Yet Be Purchased Under the Program                             3,000
Partnership's common units authorized for repurchase in a private transaction                             1,150 [1]
Maximum Number of Units that May Yet Be Purchased Under the Program                             4,150
Total Number of Units Purchased as Part of a Publicly Announced Plan or Program 1,308 [1] 228 161 219 91 331 645 39 1,697 310 1,015 3,022 22    
Average Price Paid per Unit $ 4.95 [1],[2] $ 4.88 [2] $ 4.74 [2] $ 4.40 [2] $ 4.25 [2] $ 4.13 [2] $ 4.20 [2] $ 4.28 [2] $ 4.92 [2] $ 4.36 [2] $ 4.18 [2] $ 4.61 [2] $ 4.26 [2]    
Maximum Number of Units that May Yet Be Purchased Under the Program 1,106 [1] 2,414 2,642 2,803 3,022 3,113 3,444 4,089 1,106 [1] 2,803 3,113 1,106 [1] 4,128 3,022  
[1] June 2013 common unit repurchases include 1.15 million common units acquired in a private transaction.
[2] Amounts include repurchase costs.