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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 6 Months Ended 12 Months Ended
Mar. 31, 2013
Jan. 31, 2013
Dec. 31, 2012
Nov. 30, 2012
Oct. 31, 2012
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Sep. 30, 2012
Feb. 28, 2013
Jul. 31, 2012
Capital Unit [Line Items]                      
Total Number of Units Purchased as Part of a Publicly Announced Plan or Program 219 91 331 645 39 310 1,015 1,325 22    
Average Price Paid per Unit $ 4.40 [1] $ 4.25 [1] $ 4.13 [1] $ 4.20 [1] $ 4.28 [1] $ 4.36 [1] $ 4.18 [1] $ 4.22 [1] $ 4.26 [1]    
Maximum Number of Units that May Yet Be Purchased Under the Program 1,653 1,872 1,963 2,294 2,939 1,653 1,963 1,653 2,978 1,872 3,000
[1] Amounts include repurchase costs.