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Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Selected Quarterly Financial Data [Line Items]                      
Sales $ 167,161 $ 245,604 $ 762,309 $ 499,217 $ 222,362 $ 326,511 $ 892,241 $ 520,610 $ 1,674,291 $ 1,961,724 $ 1,741,796
Gross profit for product, installation and service 42,521 59,765 239,132 129,285 37,507 60,682 199,645 108,590 470,703 406,424  
Operating income (loss) (61,182) (10,073) 134,095 30,773 (40,188) (10,797) 93,953 36,887 93,613 79,855 66,005
Income (loss) before income taxes (72,428) (13,970) 129,876 26,913 (44,115) (16,618) 89,289 32,843 70,391 61,399 49,827
Net income (loss) (45,326) (8,359) 75,687 15,554 (25,828) (9,592) 52,216 19,288 37,556 36,084 29,906
Limited Partner interest in net income (loss) $ (45,069) $ (8,312) $ 75,259 $ 15,466 $ (25,682) $ (9,538) $ 51,922 $ 19,179 $ 37,344 $ 35,881 $ 29,747
Net income (loss) per Limited Partner unit:                      
Basic and diluted $ (0.79) [1] $ (0.15) [1] $ 1.08 [1] $ 0.24 [1] $ (0.45) [1] $ (0.17) [1] $ 0.75 [1] $ 0.29 [1] $ 0.59 [1],[2] $ 0.57 [1],[2] $ 0.47 [2]
[1] The sum of the quarters do not add-up to the total due to the weighting of Limited Partner Units outstanding, rounding or the theoretical effects of FASB ASC 260-10-45-60 to Master Limited Partners earnings per unit.
[2] See Note 17 Earnings Per Limited Partner Units.