Segment Information - Schedule of Reconciliation of Net Income to EBITDA (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Net income (loss)	$ 48,545	$ 42,402
Interest income, net	(3)	(522)
Income tax expense (benefit)	15,947	13,255
Depreciation and amortization	6,423	3,851
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income (loss)	48,545	42,402
Interest income, net	(3)	(522)
Income tax expense (benefit)	15,947	13,255
Depreciation and amortization	6,423	3,851
EBITDA	70,912	58,986
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net income (loss)	48,745	41,020
Interest income, net	(3)	(522)
Income tax expense (benefit)	16,012	12,788
Depreciation and amortization	6,210	3,664
EBITDA	70,964	56,950
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net income (loss)	(200)	1,382
Income tax expense (benefit)	(65)	467
Depreciation and amortization	213	187
EBITDA	$ (52)	$ 2,036