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Segment Information - Details of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Net Sales $ 228,286 $ 231,502 $ 220,648 $ 200,395 $ 164,772 $ 194,551 $ 206,453 $ 179,571 $ 880,831 $ 745,347 $ 684,250
Net Income 43,301 $ 42,710 $ 47,218 $ 42,402 35,497 $ 41,976 $ 35,710 $ 31,555 175,631 144,738 134,572
Depreciation and amortization                 17,939 14,031 16,597
Income Tax Expense                 59,003 44,964 42,289
Total Assets 770,492       592,239       770,492 592,239  
Residential [Member]                      
Segment Reporting Information [Line Items]                      
Net Sales                 827,792 694,267 613,229
Commercial [Member]                      
Segment Reporting Information [Line Items]                      
Net Sales                 53,039 51,080 71,021
Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Net Sales                 880,831 745,347 684,250
Net Income                 175,631 144,738 134,572
EBITDA                 251,575 202,230 193,136
Depreciation and amortization                 17,940 14,031 16,467
Income Tax Expense                 59,003 44,964 42,289
Capital Expenditures                 172,823 67,265 33,816
Total Assets 770,492       592,239       770,492 592,239 465,122
Operating Segments [Member] | Residential [Member]                      
Segment Reporting Information [Line Items]                      
Net Sales                 827,792 694,267 613,229
Net Income                 171,197 142,811 131,823
EBITDA                 244,817 199,020 186,268
Depreciation and amortization                 17,131 13,413 13,216
Income Tax Expense                 57,488 44,292 41,421
Capital Expenditures                 171,784 65,399 31,392
Total Assets 676,948       503,883       676,948 503,883 380,682
Operating Segments [Member] | Commercial [Member]                      
Segment Reporting Information [Line Items]                      
Net Sales                 53,039 51,080 71,021
Net Income                 4,434 1,927 2,749
EBITDA                 6,758 3,210 6,868
Depreciation and amortization                 809 618 3,251
Income Tax Expense                 1,515 672 868
Capital Expenditures                 1,039 1,866 2,424
Total Assets $ 93,544       $ 88,356       $ 93,544 $ 88,356 $ 84,440