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Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Selected Quarterly Financial Data [Line Items]                      
Sales $ 162,064 $ 218,194 $ 462,025 $ 319,055 $ 167,161 $ 245,604 $ 762,309 $ 499,217 $ 1,161,338 $ 1,674,291 $ 1,961,724
Gross profit for product, installation and service 41,799 61,354 183,303 106,041 42,521 59,765 239,132 129,285 392,497 470,703  
Operating income (loss) (29,606) (2,955) 96,319 23,646 (61,182) (10,073) 134,095 30,773 87,404 93,613 79,855
Income (loss) before income taxes (31,923) (4,993) 94,113 21,475 (72,428) (13,970) 129,876 26,913 78,672 70,391 61,399
Net income (loss) (19,095) (3,238) 55,209 12,058 (45,326) (8,359) 75,687 15,554 44,934 37,556 36,084
Limited Partner interest in net income (loss) $ (18,985) $ (3,219) $ 54,896 $ 11,990 $ (45,069) $ (8,312) $ 75,259 $ 15,466 $ 44,682 $ 37,344 $ 35,881
Net income (loss) per Limited Partner unit:                      
Basic and diluted $ (0.34) [1] $ (0.06) [1] $ 0.79 [1] $ 0.19 [1] $ (0.79) [1] $ (0.15) [1] $ 1.08 [1] $ 0.24 [1] $ 0.70 [1],[2] $ 0.59 [1],[2] $ 0.57 [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.