Segment Information - Schedule of Reconciliation of Net Income to EBITDA (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net income	$ 61,366	$ 48,545	$ 47,218	$ 42,402	$ 109,910	$ 89,620
Interest expense (income), net	13		(71)		10	(593)
Income tax expense	20,978		16,249		36,925	29,504
Depreciation and amortization					15,702	7,915
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	61,366		47,218		109,910	89,620
Interest expense (income), net	13		(71)		10	(593)
Income tax expense	20,978		16,249		36,925	29,504
Depreciation and amortization	9,278		4,063		15,703	7,915
EBITDA	91,635		67,459		162,548	126,446
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net income	61,089		45,912		109,833	86,932
Interest expense (income), net	13		(71)		10	(593)
Income tax expense	20,886		15,789		36,899	28,577
Depreciation and amortization	9,020		3,865		15,231	7,529
EBITDA	91,008		65,495		161,973	122,445
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net income	277		1,306		77	2,688
Income tax expense	92		460		26	927
Depreciation and amortization	258		198		472	386
EBITDA	$ 627		$ 1,964		$ 575	$ 4,001