Segment Information - Schedule of Reconciliation of Net Income to EBITDA (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net income	$ 42,402	$ 31,555
Interest income, net	(522)	(56)
Income tax expense	13,255	7,700
Depreciation and Amortization	3,851	3,394
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	42,402	31,555
Interest income, net	(522)	(56)
Income tax expense	13,255	7,700
Depreciation and Amortization	3,851	3,394
EBITDA	58,986	42,593
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net income	41,020	31,255
Interest income, net	(522)	(56)
Income tax expense	12,788	7,600
Depreciation and Amortization	3,664	3,268
EBITDA	56,950	42,067
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net income	1,382	300
Income tax expense	467	100
Depreciation and Amortization	187	126
EBITDA	$ 2,036	$ 526