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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, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | $ 229,618 |  | $ 327,354 |  | $ 684,031 |  | $ 436,834 |  | $ 181,584 |  | $ 225,801 |  | $ 532,052 |  | $ 384,118 |  |  | $ 1,677,837 |  | $ 1,323,555 |  | $ 1,161,338 |
Gross profit for product, installation and service | 43,387 |  | 79,377 |  | 216,079 |  | 124,499 |  | 42,467 |  | 63,309 |  | 184,685 |  | 118,038 |  |  | 463,342 |  | 408,499 |  |  |
Operating income (loss) | (41,654) |  | (8,817) |  | 85,473 |  | 31,066 |  | (27,126) |  | (19,811) |  | 69,032 |  | 33,237 |  |  | 66,068 |  | 55,332 |  | 87,404 |
Income (loss) before income taxes | (36,925) |  | (11,421) |  | 82,783 |  | 28,670 |  | (29,092) |  | (21,766) |  | 66,996 |  | 31,138 |  | $ 34,400 | 63,107 |  | 47,276 |  | 78,672 |
Net income (loss) | (21,450) |  | (8,005) |  | 54,778 |  | 30,182 |  | (17,747) |  | (13,332) |  | 39,704 |  | 18,275 |  |  | 55,505 |  | 26,900 |  | 44,934 |
Limited Partner interest in net income (loss) | $ (21,319) |  | $ (7,956) |  | $ 54,459 |  | $ 30,007 |  | $ (17,644) |  | $ (13,253) |  | $ 39,471 |  | $ 18,170 |  |  | $ 55,191 |  | $ 26,744 |  | $ 44,682 |
Net income (loss) per Limited Partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted | $ (0.40) | [1] | $ (0.15) | [1] | $ 0.81 | [1] | $ 0.45 | [1] | $ (0.32) | [1] | $ (0.24) | [1] | $ 0.59 | [1] | $ 0.28 | [1] |  | $ 0.89 | [1],[2] | $ 0.46 | [1],[2] | $ 0.70 | [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 18 - Earnings Per Limited Partner Units.

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