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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |
Cash paid |  |  | $ 38,825 | $ 24,740
Seller Obligations |  |  | 6,965 | 4,322
Total Purchase Price |  |  | 45,790 | 29,062
Revenue | $ 420,486 | $ 396,449 | 1,211,756 | 1,110,398
Net Income | 28,077 | 21,212 | $ 69,402 | $ 48,965
Royals [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date |  |  | Feb. 29, 2020 |
Acquisition Type |  |  | Asset |
Cash paid |  |  | $ 7,590 |
Seller Obligations |  |  | 2,500 |
Total Purchase Price |  |  | 10,090 |
Revenue | 2,843 |  | 6,650 |
Net Income | 279 |  | $ 628 |
First State Insulation [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date |  |  |  | Mar. 18, 2019
Acquisition Type |  |  |  | Asset
Cash paid |  |  |  | $ 5,125
Seller Obligations |  |  |  | 1,355
Total Purchase Price |  |  |  | 6,480
Revenue |  | 3,156 |  | 6,586
Net Income |  | 174 |  | $ 374
Other Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition Type |  |  | Asset | Asset
Cash paid |  |  | $ 5,035 | $ 3,450
Seller Obligations |  |  | 1,538 | 974
Total Purchase Price |  |  | 6,573 | 4,424
Revenue | 1,879 | 7,262 | 2,643 | 7,262
Net Income | (252) | 591 | (291) | $ 591
Expert Insulation [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date |  |  |  | Jun. 24, 2019
Acquisition Type |  |  |  | Asset
Cash paid |  |  |  | $ 16,165
Seller Obligations |  |  |  | 1,993
Total Purchase Price |  |  |  | 18,158
Revenue |  | 3,147 |  | 3,339
Net Income |  | 193 |  | 160
2020 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | 9,630 |  | 14,201 |
Net Income | (90) |  | $ 220 |
2019 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  | 13,565 |  | 17,187
Net Income |  | $ 958 |  | $ 1,125
Energy One [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date |  |  | Aug. 10, 2020 |
Acquisition Type |  |  | Asset |
Cash paid |  |  | $ 13,200 |
Seller Obligations |  |  | 1,591 |
Total Purchase Price |  |  | 14,791 |
Revenue | 2,853 |  | 2,853 |
Net Income | (202) |  | $ (202) |
Storm Master [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date |  |  | Aug. 31, 2020 |
Acquisition Type |  |  | Asset |
Cash paid |  |  | $ 13,000 |
Seller Obligations |  |  | 1,336 |
Total Purchase Price |  |  | 14,336 |
Revenue | 2,055 |  | 2,055 |
Net Income | $ 85 |  | $ 85 |

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