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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, 2014
Aug. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Jul. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
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]   1,150 [1]   1,150 [1] 1,150        
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 54 [2] 9 [2] 63 [2] 250 [2],[3] 313 [2] 3,284 [1],[2] 22 [2]      
Average Price Paid per Unit $ 5.78 [4] $ 5.76 [4] $ 5.77 [4] $ 5.20 [3],[4] $ 5.32 [4] $ 4.63 [1],[4] $ 4.26 [4]      
Maximum Number of Units that May Yet Be Purchased 2,425 2,479 2,425 2,488 [3] 2,425 2,738 [1] 6,022 2,488 2,488 2,488
[1] Fiscal year 2013 common unit repurchases include 1.15 million common units acquired in a private transaction.
[2] Units were repurchased as part of a publicly announced program, except as noted in a private transaction.
[3] First quarter fiscal year 2014 common unit repurchases were acquired in a private transaction.
[4] Amounts include repurchase costs.