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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 25,171 | $ 29,471 | $ 42,820 | $ 37,110 | $ 18,299 | $ 20,098 | $ 28,782 | $ 27,949 | $ 134,572 | $ 95,128 | $ 67,847
Interest (income) expense, net |  |  |  |  |  |  |  |  | 192 | (461) | (1,125)
Taxes |  |  |  |  |  |  |  |  | 42,289 | 46,791 | 34,983
Depreciation and amortization |  |  |  |  |  |  |  |  | 16,597 | 16,860 | $ 14,498
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 134,572 | 95,128 |
Interest (income) expense, net |  |  |  |  |  |  |  |  | (192) | 461 |
Taxes |  |  |  |  |  |  |  |  | 42,289 | 46,791 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 16,467 | 16,730 |
EBITDA |  |  |  |  |  |  |  |  | 193,136 | 159,110 |
Operating Segments [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 131,823 | 97,412 |
Interest (income) expense, net |  |  |  |  |  |  |  |  | (192) | 461 |
Taxes |  |  |  |  |  |  |  |  | 41,421 | 47,911 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 13,216 | 14,598 |
EBITDA |  |  |  |  |  |  |  |  | 186,268 | 160,382 |
Operating Segments [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 2,749 | (2,284) |
Taxes |  |  |  |  |  |  |  |  | 868 | (1,120) |
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,251 | 2,132 |
EBITDA |  |  |  |  |  |  |  |  | $ 6,868 | $ (1,272) |

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