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Company's Repurchase Activities (Detail) - $ / shares
shares in Thousands
 60 Months Ended
Sep. 30, 2016
Nov. 30, 2017
Oct. 31, 2017
Sep. 30, 2017
Capital Unit [Line Items]        
Company's common units authorized for repurchase       7,344
Plan III Common Units Repurchase Program        
Capital Unit [Line Items]        
Company's common units authorized for repurchase       4,894
Total Number of Units Purchased [1],[2] 5,137      
Average Price Paid per Unit [1],[3] $ 5.78      
Maximum Number of Units that May Yet Be Purchased 2,207 [1] 2,207 2,207 2,207
Private Transaction        
Capital Unit [Line Items]        
Company's common units authorized for repurchase       2,450
[1] Includes 2.45 million common units acquired in private transactions.
[2] Units were repurchased as part of a publicly announced program, except as noted in a private transaction.
[3] Amounts include repurchase costs.