Segment Information - Details of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 171,207	$ 144,806
Net income (loss)	37,110	27,949
Depreciation and amortization	4,765	3,764
Income tax expense (benefit)	10,415	13,747
Total assets	445,384		$ 326,227
Residential [Member]
Segment Reporting Information [Line Items]
Net sales	155,200	$ 144,800
Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	16,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	171,207
Net income (loss)	37,110
EBITDA	52,487
Depreciation and amortization	4,733
Income tax expense (benefit)	10,415
Capital expenditures	5,435
Total assets	445,384
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net sales	155,200
Net income (loss)	37,580
EBITDA	51,834
Depreciation and amortization	3,453
Income tax expense (benefit)	10,572
Capital expenditures	5,043
Total assets	366,400
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	16,007
Net income (loss)	(470)
EBITDA	653
Depreciation and amortization	1,280
Income tax expense (benefit)	(157)
Capital expenditures	392
Total assets	$ 78,984