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Partnership's Repurchase Activities (Detail) - $ / shares
shares in Thousands
 60 Months Ended
Sep. 30, 2016
Jun. 30, 2017
Capital Unit [Line Items]    
Partnership's common units authorized for repurchase   7,344
Private Transaction    
Capital Unit [Line Items]    
Partnership's common units authorized for repurchase   2,450
Total Number of Units Purchased 2,450  
Plan III Common Units Repurchase Program    
Capital Unit [Line Items]    
Partnership'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
[1] Includes 2.45 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] Amounts include repurchase costs.