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Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]                        
Sales $ 235,887 $ 283,376 $ 699,582 $ 535,027 $ 229,618 $ 327,354 $ 684,031 $ 436,834   $ 1,753,872 $ 1,677,837 $ 1,323,555
Gross profit for product, installation and service 48,482 66,191 218,549 154,484 43,387 79,377 216,079 124,499   487,706 463,342  
Operating income (loss) (43,782) (29,933) 105,002 6,063 (41,654) (8,817) 85,473 31,066   37,350 66,068 55,332
Income (loss) before income taxes (46,545) (33,153) 101,564 3,288 (36,925) (11,421) 82,783 28,670 $ 34,400 25,154 63,107 47,276
Net income (loss) (33,905) (23,098) 72,325 2,315 (21,450) (8,005) 54,778 30,182   17,637 55,505 26,900
Limited Partner's interest in net income (loss) $ (33,681) $ (22,948) $ 71,871 $ 2,300 $ (21,319) $ (7,956) $ 54,459 $ 30,007   $ 17,542 $ 55,191 $ 26,744
Net income (loss) per Limited Partner unit:                        
Basic and diluted income per Limited Partner Unit : $ (0.69) [1] $ (0.46) [1] $ 1.15 [1] $ 0.04 [1] $ (0.40) [1] $ (0.15) [1] $ 0.81 [1] $ 0.45 [1]   $ 0.35 [1],[2] $ 0.89 [1],[2] $ 0.46 [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 19 - Earnings Per Limited Partner Units.