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Net Income Allocation and Per Unit Data (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Basic and Diluted Earnings Per Limited Partner:    
Net income $ 12,058 $ 15,554
Less General Partner's interest in net income 68 88
Net income available to limited partners 11,990 15,466
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 1,231 1,930
Limited Partner's interest in net income under FASB ASC 260-10-45-60 $ 10,759 $ 13,536
Per unit data:    
Basic and diluted net income available to limited partners $ 0.21 $ 0.27
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 0.02 0.03
Limited Partner's interest in net income under FASB ASC 260-10-45-60 [1] $ 0.19 $ 0.24
Weighted average number of Limited Partner units outstanding 57,281 57,294
[1] See Note 13 Earnings Per Limited Partner Unit.