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Company's Repurchase Activities (Detail) - $ / shares
shares in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended 60 Months Ended 67 Months Ended
Nov. 30, 2018
Oct. 31, 2018
Sep. 30, 2018
Aug. 31, 2018
Jul. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Jan. 31, 2018
Dec. 31, 2017
Repurchase Plan                        
Capital Unit [Line Items]                        
Total Number of Units Purchased     191 114 125 430 1,089 1,281 2,800 5,137 2,700  
Average Price Paid per Unit [1]     $ 9.73 $ 9.68 $ 9.72 $ 9.72 $ 9.66 $ 9.38 $ 9.54 $ 5.78    
Maximum Number of Units that May Yet Be Purchased     5,359 5,550 [2] 3,005 5,359 3,130 4,219 [3] 5,359 2,207   2,207
Repurchase Plan | Subsequent Event                        
Capital Unit [Line Items]                        
Total Number of Units Purchased 182 151                    
Average Price Paid per Unit [1] $ 9.71 $ 9.70                    
Maximum Number of Units that May Yet Be Purchased 5,026 [4] 5,208                    
Publicly Announced Plans or Programs As Part of Repurchase Plan                        
Capital Unit [Line Items]                        
Total Number of Units Purchased     191 114 125 430 1,089 1,281 2,800 2,693    
Publicly Announced Plans or Programs As Part of Repurchase Plan | Subsequent Event                        
Capital Unit [Line Items]                        
Total Number of Units Purchased 182 151                    
[1] Amounts include repurchase costs.
[2] In August 2018, the Board authorized an increase in the number of Common Units available for repurchase from 2.9 million to 5.55 million.
[3] In February 2018, the Board authorized an increase in the number of Common Units available for repurchase from 2.2 million to 5.5 million.
[4] Of the total available for repurchase, approximately 2.5 million are available for repurchase in open market transactions and 2.5 million are available for repurchase in privately-negotiated transactions.