Segment Information - Schedule of Reconciliation of Net Income to EBITDA (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net income	$ 73,795	$ 61,366	$ 48,545	$ 42,710	$ 47,218	$ 42,402	$ 183,705	$ 132,331
Interest income, net	10			208			0	801
Income tax expense	24,311			14,435			61,235	43,938
Depreciation and amortization							25,604	12,450
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	73,795			42,710			183,705	132,331
Interest income, net	(10)			(208)				(801)
Income tax expense	24,311			14,435			61,235	43,938
Depreciation and amortization	9,901			4,535			25,604	12,450
EBITDA	107,997			61,472			270,544	187,918
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net income	72,603			42,225			182,437	129,157
Interest income, net	(10)			(208)				(801)
Income tax expense	23,899			14,276			60,797	42,853
Depreciation and amortization	9,643			4,326			24,873	11,855
EBITDA	106,135			60,619			268,107	183,064
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net income	1,192			485			1,268	3,174
Income tax expense	412			159			438	1,085
Depreciation and amortization	258			209			731	595
EBITDA	$ 1,862			$ 853			$ 2,437	$ 4,854