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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |
Cash paid |  |  | $ 12,625 | $ 21,290
Seller Obligations |  |  | 4,037 | 3,348
Total Purchase Price |  |  | 16,662 | 24,638
Revenue | $ 393,939 | $ 371,814 | 791,270 | 713,949
Net Income | 25,337 | 18,919 | $ 41,325 | $ 27,753
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 | 3,023 |  | 3,807 |
Net Income | 436 |  | $ 349 |
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 |  | 2,942 |  | 3,430
Net Income |  | 177 |  | $ 200
Other Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition Type |  |  | Asset |
Cash paid |  |  | $ 5,035 |
Seller Obligations |  |  | 1,537 |
Total Purchase Price |  |  | 6,572 |
Revenue | 538 |  | 764 |
Net Income | (18) |  | (39) |
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 |  | 192 |  | 192
Net Income |  | (33) |  | (33)
2020 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | 3,561 |  | 4,571 |
Net Income | $ 418 |  | $ 310 |
2019 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  | 3,134 |  | 3,622
Net Income |  | $ 144 |  | $ 167

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