Segment Information - Details of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 200,395	$ 179,571
Net income	42,402	31,555
Depreciation and amortization	3,851	3,394
Income tax expense	13,255	7,700
Total Assets	630,856		$ 592,239
Residential [Member]
Segment Reporting Information [Line Items]
Net sales	186,874	165,479
Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	13,521	14,092
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	200,395	179,571
Net income	42,402	31,555
EBITDA	58,986	42,593
Depreciation and amortization	3,851	3,394
Income tax expense	13,255	7,700
Capital expenditures	22,733	8,647
Total Assets	630,856	535,645
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net sales	186,874	165,479
Net income	41,020	31,255
EBITDA	56,950	42,067
Depreciation and amortization	3,664	3,268
Income tax expense	12,788	7,600
Capital expenditures	22,416	7,694
Total Assets	539,352	448,303
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	13,521	14,092
Net income	1,382	300
EBITDA	2,036	526
Depreciation and amortization	187	126
Income tax expense	467	100
Capital expenditures	317	953
Total Assets	$ 91,504	$ 87,342