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Segment Information - Details of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]              
Net sales $ 220,648   $ 206,453   $ 421,043 $ 386,024  
Net income 47,218 $ 42,402 35,710 $ 31,555 89,620 67,265  
Depreciation and amortization         7,915 6,792  
Income tax expense 16,249   12,030   29,504 19,730  
Total Assets 670,990       670,990   $ 592,239
Residential [Member]              
Segment Reporting Information [Line Items]              
Net sales 208,777   193,468   395,751 358,947  
Commercial [Member]              
Segment Reporting Information [Line Items]              
Net sales 11,771   12,985   25,292 27,077  
Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Net sales 220,648   206,453   421,043 386,024  
Net income 47,218   35,710   89,620 67,265  
EBITDA 67,459   51,138   126,446 93,731  
Depreciation and amortization 4,063   3,399   7,915 6,793  
Income tax expense 16,249   12,030   29,504 19,730  
Capital expenditures 39,880   10,414   62,613 19,061  
Total Assets 670,990   536,198   670,990 536,198  
Operating Segments [Member] | Residential [Member]              
Segment Reporting Information [Line Items]              
Net sales 208,877   193,468   395,751 358,947  
Net income 45,912   35,223   86,932 66,478  
EBITDA 65,495   50,353   122,445 92,419  
Depreciation and amortization 3,865   3,258   7,529 6,525  
Income tax expense 15,789   11,866   28,577 19,466  
Capital expenditures 39,610   10,124   62,026 17,818  
Total Assets 577,684   447,725   577,684 447,725  
Operating Segments [Member] | Commercial [Member]              
Segment Reporting Information [Line Items]              
Net sales 11,771   12,985   25,292 27,077  
Net income 1,306   487   2,688 787  
EBITDA 1,964   785   4,001 1,312  
Depreciation and amortization 198   141   386 268  
Income tax expense 460   164   927 264  
Capital expenditures 270   290   587 1,243  
Total Assets $ 93,306   $ 88,473   $ 93,306 $ 88,473