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Net Income Allocation and Per Unit Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Basic and Diluted Earnings Per Limited Partner:        
Net income (loss) $ (7,588) $ (11,789) $ 43,843 $ 31,624
Less General Partners' interest in net income (loss) (41) (62) 237 166
Net income (loss) available to limited partners (7,547) (11,727) 43,606 31,458
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60     5,623 3,141
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 $ (7,547) $ (11,727) $ 37,983 $ 28,317
Per unit data:        
Basic and diluted net income (loss) available to limited partners (0.13) (0.19) 0.73 0.51
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60     0.10 0.05
Limited Partner's interest in net income (loss) under FASB ASC 260-10-45-60 $ (0.13) [1] $ (0.19) [1] $ 0.63 [1] $ 0.46 [1]
Weighted average number of Limited Partner units outstanding 59,370 61,024 59,918 62,236
[1] See Note 14 - Earnings (Loss) Per Limited Partner Unit.