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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, 2016
Dec. 31, 2015
Basic and Diluted Earnings Per Limited Partner:    
Net income $ 18,275 $ 12,058
Less General Partner's interest in net income 105 68
Net income available to limited partners 18,170 11,990
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 2,446 1,231
Limited Partner's interest in net income under FASB ASC 260-10-45-60 $ 15,724 $ 10,759
Per unit data:    
Basic and diluted net income available to limited partners $ 0.33 $ 0.21
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 0.05 0.02
Limited Partner's interest in net income under FASB ASC 260-10-45-60 [1] $ 0.28 $ 0.19
Weighted average number of Limited Partner units outstanding 55,888 57,281
[1] See Note 13 Earnings Per Limited Partner Unit.