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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Cash paid |  |  | $ 24,740 | $ 34,682
Seller Obligations |  |  | 4,322 | 5,420
Total Purchase Price |  |  | 29,062 | 40,102
Revenue | $ 396,449 | $ 348,999 | 1,110,398 | 983,311
Net Income | 21,212 | 15,563 | $ 48,965 | $ 38,272
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 |
CDG Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date |  |  |  | Mar. 19, 2018
Acquisition Type |  |  |  | Asset
Cash paid |  |  |  | $ 9,440
Seller Obligations |  |  |  | 1,973
Total Purchase Price |  |  |  | 11,413
Revenue |  | 3,848 |  | 7,572
Net Income |  | 164 |  | $ 229
Other Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition Type |  |  | Asset | Shares/Asset
Cash paid |  |  | $ 3,450 | $ 25,242
Seller Obligations |  |  | 974 | 3,447
Total Purchase Price |  |  | 4,424 | 28,689
Revenue | 7,262 | 7,003 | 7,262 | 12,782
Net Income | 591 | 42 | $ 591 | 423
2018 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  | 10,851 |  | 20,354
Net Income |  | $ 206 |  | $ 652
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 |
2019 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | 13,565 |  | 17,187 |
Net Income | $ 958 |  | $ 1,125 |

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