Segment Information - Details of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net sales	$ 245,524	$ 200,395
Net income (loss)	48,545	42,402
Depreciation and amortization	6,423	3,851
Income tax expense (benefit)	15,947	13,255
Total assets	900,290		$ 770,492
Residential [Member]
Segment Reporting Information [Line Items]
Net sales	233,070	186,874
Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	12,454	13,521
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	245,524	200,395
Net income (loss)	48,545	42,402
EBITDA	70,912	58,986
Depreciation and amortization	6,423	3,851
Income tax expense (benefit)	15,947	13,255
Capital expenditures	58,093	22,733
Total assets	900,290	630,856
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net sales	233,070	186,874
Net income (loss)	48,745	41,020
EBITDA	70,964	56,950
Depreciation and amortization	6,210	3,664
Income tax expense (benefit)	16,012	12,788
Capital expenditures	56,563	22,416
Total assets	808,864	539,352
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	12,454	13,521
Net income (loss)	(200)	1,382
EBITDA	(52)	2,036
Depreciation and amortization	213	187
Income tax expense (benefit)	(65)	467
Capital expenditures	1,530	317
Total assets	$ 91,426	$ 91,504