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Segment Information - Schedule of Reconciliation of Net Income to EBITDA (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net income | $ 41,976 | $ 35,710 | $ 31,555 | $ 29,471 | $ 42,820 | $ 37,110 | $ 109,241 | $ 109,401
Interest (income) expense, net | (744) |  |  | (222) |  |  | (801) | 377
Income tax expense | 13,790 |  |  | 9,829 |  |  | 33,520 | 34,657
Depreciation and amortization |  |  |  |  |  |  | 10,477 | 13,164
Operating Segments [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net income | 41,976 |  |  | 29,471 |  |  | 109,241 | 109,401
Interest (income) expense, net | (744) |  |  | (222) |  |  | (801) |
Income tax expense | 13,790 |  |  | 9,829 |  |  | 33,520 | 34,657
Depreciation and amortization | 3,587 |  |  | 3,769 |  |  | 10,380 | 13,067
EBITDA | 58,609 |  |  | 42,847 |  |  | 152,340 | 157,502
Operating Segments [Member] | Residential [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net income | 41,381 |  |  | 27,755 |  |  | 107,859 | 107,449
Interest (income) expense, net | (744) |  |  | (222) |  |  | (794) | 377
Income tax expense | 13,580 |  |  | 9,259 |  |  | 33,046 | 34,009
Depreciation and amortization | 3,422 |  |  | 3,275 |  |  | 9,947 | 10,004
EBITDA | 57,639 |  |  | 40,067 |  |  | 150,058 | 151,839
Operating Segments [Member] | Commercial [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net income | 595 |  |  | 1,716 |  |  | 1,382 | 1,952
Interest (income) expense, net |  |  |  |  |  |  | (7) |
Income tax expense | 210 |  |  | 570 |  |  | 474 | 648
Depreciation and amortization | 165 |  |  | 494 |  |  | 433 | 3,063
EBITDA | $ 970 |  |  | $ 2,780 |  |  | $ 2,282 | $ 5,663

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