Segment Information - Details of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 122,212	$ 140,194	$ 157,941	$ 144,806	$ 95,322	$ 106,168	$ 146,450	$ 131,676	$ 565,153	$ 479,616	$ 440,804
Net income (loss)	18,299	$ 20,098	$ 28,782	$ 27,949	12,629	$ 7,787	$ 23,725	$ 23,706	95,128	67,847	48,098
Depreciation and amortization									16,860	14,498	14,384
Income tax expense (benefit)									46,791	34,983	28,689
Total assets	326,227				$ 221,430				326,227	221,430
Residential [Member]
Segment Reporting Information [Line Items]
Net sales									543,300	$ 479,600	$ 440,800
Commercial [Member]
Segment Reporting Information [Line Items]
Net sales									21,800
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									565,153
Net income (loss)									95,128
EBITDA									159,110
Depreciation and amortization									16,730
Income tax expense (benefit)									46,791
Capital expenditures									15,040
Total assets	326,227								326,227
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net sales									543,346
Net income (loss)									97,412
EBITDA									160,382
Depreciation and amortization									14,598
Income tax expense (benefit)									47,911
Capital expenditures									14,989
Total assets	247,817								247,817
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net sales									21,807
Net income (loss)									(2,284)
EBITDA									(1,272)
Depreciation and amortization									2,132
Income tax expense (benefit)									(1,120)
Capital expenditures									51
Total assets	$ 78,410								$ 78,410