Segment Information - Details of Segment Information (Detail) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales		$ 166,380	$ 140,194	$ 544,279	$ 442,941
Net income (loss)		29,471	20,098	109,401	76,829
Depreciation and amortization				13,164	12,065
Income tax expense		9,829	10,208	34,657	39,715
Total assets		434,909		434,909		$ 326,227
Residential [Member]
Segment Reporting Information [Line Items]
Net sales		146,998	131,043	491,399	433,790
Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	$ 9,200	19,382	9,151	52,880	9,151
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales		166,380	140,194	544,279	442,941
Net income (loss)		29,471	20,098	109,401	76,829
EBITDA		42,847	34,885	157,502	129,027
Depreciation and amortization		3,769	4,520	13,067	11,968
Income tax expense		9,829	10,208	34,657	39,715
Capital expenditures		3,914	3,983	15,324	11,108
Total assets	311,196	434,909	311,196	434,909	311,196
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net sales		146,998	131,043	491,399	433,790
Net income (loss)		27,755	20,173	107,449	76,904
EBITDA		40,067	34,079	151,839	128,221
Depreciation and amortization		3,275	3,639	10,004	11,087
Income tax expense		9,259	10,208	34,009	39,715
Capital expenditures		3,693	3,943	14,274	11,068
Total assets	232,663	352,014	232,663	352,014	232,663
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net sales		19,382	9,151	52,880	9,151
Net income (loss)		1,716	(75)	1,952	(75)
EBITDA		2,780	806	5,663	806
Depreciation and amortization		494	881	3,063	881
Income tax expense		570		648
Capital expenditures		221	40	1,050	40
Total assets	$ 78,533	$ 82,895	$ 78,533	$ 82,895	$ 78,533