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Segment Information - Details of Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 122,212 | $ 140,194 | $ 157,941 | $ 144,806 | $ 95,322 | $ 106,168 | $ 146,450 | $ 131,676 | $ 565,153 | $ 479,616 | $ 440,804
Net income (loss) | 18,299 | $ 20,098 | $ 28,782 | $ 27,949 | 12,629 | $ 7,787 | $ 23,725 | $ 23,706 | 95,128 | 67,847 | 48,098
Depreciation and amortization |  |  |  |  |  |  |  |  | 16,860 | 14,498 | 14,384
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 46,791 | 34,983 | 28,689
Total assets | 326,227 |  |  |  | $ 221,430 |  |  |  | 326,227 | 221,430 |
Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 543,300 | $ 479,600 | $ 440,800
Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 21,800 |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 565,153 |  |
Net income (loss) |  |  |  |  |  |  |  |  | 95,128 |  |
EBITDA |  |  |  |  |  |  |  |  | 159,110 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 16,730 |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 46,791 |  |
Capital expenditures |  |  |  |  |  |  |  |  | 15,040 |  |
Total assets | 326,227 |  |  |  |  |  |  |  | 326,227 |  |
Operating Segments [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 543,346 |  |
Net income (loss) |  |  |  |  |  |  |  |  | 97,412 |  |
EBITDA |  |  |  |  |  |  |  |  | 160,382 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 14,598 |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 47,911 |  |
Capital expenditures |  |  |  |  |  |  |  |  | 14,989 |  |
Total assets | 247,817 |  |  |  |  |  |  |  | 247,817 |  |
Operating Segments [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 21,807 |  |
Net income (loss) |  |  |  |  |  |  |  |  | (2,284) |  |
EBITDA |  |  |  |  |  |  |  |  | (1,272) |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,132 |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (1,120) |  |
Capital expenditures |  |  |  |  |  |  |  |  | 51 |  |
Total assets | $ 78,410 |  |  |  |  |  |  |  | $ 78,410 |  |

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