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Segment Information - Schedule of Reconciliation of Net Income to EBITDA (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Net Income $ 43,301 $ 42,710 $ 47,218 $ 42,402 $ 35,497 $ 41,976 $ 35,710 $ 31,555 $ 175,631 $ 144,738 $ 134,572
Interest (income) expense, net                 (999) (1,503) (192)
Income Tax Expense                 59,003 44,964 42,289
Depreciation and Amortization                 17,939 14,031 16,597
Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Net Income                 175,631 144,738 134,572
Interest (income) expense, net                 (999) (1,503) (192)
Income Tax Expense                 59,003 44,964 42,289
Depreciation and Amortization                 17,940 14,031 16,467
EBITDA                 251,575 202,230 193,136
Operating Segments [Member] | Residential [Member]                      
Segment Reporting Information [Line Items]                      
Net Income                 171,197 142,811 131,823
Interest (income) expense, net                 (999) (1,496) (192)
Income Tax Expense                 57,488 44,292 41,421
Depreciation and Amortization                 17,131 13,413 13,216
EBITDA                 244,817 199,020 186,268
Operating Segments [Member] | Commercial [Member]                      
Segment Reporting Information [Line Items]                      
Net Income                 4,434 1,927 2,749
Interest (income) expense, net                 0 (7) 0
Income Tax Expense                 1,515 672 868
Depreciation and Amortization                 809 618 3,251
EBITDA                 $ 6,758 $ 3,210 $ 6,868