Segment Information - Details of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 179,571	$ 171,207
Net income (loss)	31,555	37,110
Depreciation and amortization	3,425	4,765
Income tax expense (benefit)	7,700	10,415
Total assets	535,645		$ 465,122
Residential [Member]
Segment Reporting Information [Line Items]
Net sales	165,479	155,200
Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	14,092	16,007
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	179,571	171,207
Net income (loss)	31,555	37,110
EBITDA	42,593	52,487
Depreciation and amortization	3,394	4,733
Income tax expense (benefit)	7,700	10,415
Capital expenditures	8,647	5,435
Total assets	535,645	445,384
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net sales	165,479	155,200
Net income (loss)	31,255	37,580
EBITDA	42,067	51,834
Depreciation and amortization	3,268	3,453
Income tax expense (benefit)	7,600	10,572
Capital expenditures	7,694	5,043
Total assets	448,303	366,400
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	14,092	16,007
Net income (loss)	300	(470)
EBITDA	526	653
Depreciation and amortization	126	1,280
Income tax expense (benefit)	100	(157)
Capital expenditures	953	392
Total assets	$ 87,342	$ 78,984