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Segment Information - Schedule of Reconciliation of Net Income to EBITDA (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Net income (loss) | $ 31,555 | $ 37,110
Interest (income) expense, net | (56) | 229
Income tax expense (benefit) | 7,700 | 10,415
Depreciation and amortization | 3,425 | 4,765
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Net income (loss) | 31,555 | 37,110
Interest (income) expense, net | (56) | 229
Income tax expense (benefit) | 7,700 | 10,415
Depreciation and amortization | 3,394 | 4,733
EBITDA | 42,593 | 52,487
Operating Segments [Member] | Residential [Member] |  |
Segment Reporting Information [Line Items] |  |
Net income (loss) | 31,255 | 37,580
Interest (income) expense, net | (56) | 229
Income tax expense (benefit) | 7,600 | 10,572
Depreciation and amortization | 3,268 | 3,453
EBITDA | 42,067 | 51,834
Operating Segments [Member] | Commercial [Member] |  |
Segment Reporting Information [Line Items] |  |
Net income (loss) | 300 | (470)
Income tax expense (benefit) | 100 | (157)
Depreciation and amortization | 126 | 1,280
EBITDA | $ 526 | $ 653

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