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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) | $ 35,497 | $ 41,976 | $ 35,710 | $ 31,555 | $ 25,171 | $ 29,471 | $ 42,820 | $ 37,110 | $ 144,738 | $ 134,572 | $ 95,128
Interest (income) expense, net |  |  |  |  |  |  |  |  | (1,503) | (192) | 461
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 44,964 | 42,289 | 46,791
Depreciation and Amortization |  |  |  |  |  |  |  |  | 14,031 | 16,597 | 16,860
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) |  |  |  |  |  |  |  |  | 144,738 | 134,572 | 95,128
Interest (income) expense, net |  |  |  |  |  |  |  |  | (1,503) | (192) | 461
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 44,964 | 42,289 | 46,791
Depreciation and Amortization |  |  |  |  |  |  |  |  | 14,031 | 16,467 | 16,730
EBITDA |  |  |  |  |  |  |  |  | 202,230 | 193,136 | 159,110
Operating Segments [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) |  |  |  |  |  |  |  |  | 142,811 | 131,823 | 97,412
Interest (income) expense, net |  |  |  |  |  |  |  |  | (1,496) | (192) | 461
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 44,292 | 41,421 | 47,911
Depreciation and Amortization |  |  |  |  |  |  |  |  | 13,413 | 13,216 | 14,598
EBITDA |  |  |  |  |  |  |  |  | 199,020 | 186,268 | 160,382
Operating Segments [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) |  |  |  |  |  |  |  |  | 1,927 | 2,749 | (2,284)
Interest (income) expense, net |  |  |  |  |  |  |  |  | (7) |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 672 | 868 | (1,120)
Depreciation and Amortization |  |  |  |  |  |  |  |  | 618 | 3,251 | 2,132
EBITDA |  |  |  |  |  |  |  |  | $ 3,210 | $ 6,868 | $ (1,272)

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