Segment Information - Details of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 206,453		$ 206,692		$ 386,024	$ 377,899
Net income	35,710	$ 31,555	42,819	$ 37,110	67,265	79,930
Depreciation and amortization					6,857	9,363
Income tax expense	12,030		14,413		19,730	24,828
Total assets	536,198				536,198		$ 465,122
Residential [Member]
Segment Reporting Information [Line Items]
Net sales	193,468		189,201		358,947	344,401
Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	12,985		17,491		27,077	33,498
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	206,453		206,692		386,024	377,899
Net income	35,710		42,819		67,265	79,930
EBITDA	51,138		62,167		93,731	114,655
Depreciation and amortization	3,399		4,566		6,793	9,299
Income tax expense	12,030		14,413		19,730	24,828
Capital expenditures	10,414		12,263		19,061	17,697
Total assets	536,198		414,445		536,198	414,445
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net sales	193,468		189,201		358,947	344,401
Net income	35,223		42,115		66,478	79,694
EBITDA	50,353		59,939		92,419	111,773
Depreciation and amortization	3,258		3,277		6,525	6,731
Income tax expense	11,866		14,178		19,466	24,750
Capital expenditures	10,124		11,825		17,818	16,868
Total assets	447,725		334,289		447,725	334,289
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	12,985		17,491		27,077	33,498
Net income	487		704		787	236
EBITDA	785		2,228		1,312	2,882
Depreciation and amortization	141		1,289		268	2,568
Income tax expense	164		235		264	78
Capital expenditures	290		438		1,243	829
Total assets	$ 88,473		$ 80,156		$ 88,473	$ 80,156