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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid |  |  |  |  |  |  |  |  | $ 137,367 | $ 55,493 | $ 85,200
Seller Obligations | $ 5,128 |  |  |  | $ 4,459 |  |  |  | 5,128 | 4,459 | 13,180
Fair Value of Common Stock Issued | 10,859 |  |  |  |  |  |  |  | 10,859 |  |
Total Purchase Price |  |  |  |  |  |  |  |  | 153,354 | 59,952 | 98,380
Revenue | 299,869 | $ 295,193 | $ 282,196 | $ 255,669 | 233,977 | $ 225,392 | $ 211,913 | $ 191,698 | 1,132,927 | 862,980 | 662,719
Net Income (Loss) | 10,793 | $ 12,010 | $ 11,973 | $ 6,364 | 11,081 | $ 11,549 | $ 9,993 | $ 5,813 | $ 41,140 | $ 38,436 | $ 26,517
Alpha [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Date |  |  |  |  |  |  |  |  | Jan. 05, 2017 |  |
Acquisition Type |  |  |  |  |  |  |  |  | Share |  |
Cash paid |  |  |  |  |  |  |  |  | $ 103,810 |  |
Seller Obligations | 2,002 |  |  |  |  |  |  |  | 2,002 |  |
Fair Value of Common Stock Issued | 10,859 |  |  |  |  |  |  |  | 10,859 |  |
Total Purchase Price |  |  |  |  |  |  |  |  | 116,671 |  |
Revenue |  |  |  |  |  |  |  |  | 116,070 |  |
Net Income (Loss) |  |  |  |  |  |  |  |  | $ (1,148) |  |
Columbia [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Date |  |  |  |  |  |  |  |  | Jun. 26, 2017 |  |
Acquisition Type |  |  |  |  |  |  |  |  | Asset |  |
Cash paid |  |  |  |  |  |  |  |  | $ 8,768 |  |
Seller Obligations | 225 |  |  |  |  |  |  |  | 225 |  |
Total Purchase Price |  |  |  |  |  |  |  |  | 8,993 |  |
Revenue |  |  |  |  |  |  |  |  | 6,046 |  |
Net Income (Loss) |  |  |  |  |  |  |  |  | $ 86 |  |
Astro [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Date |  |  |  |  |  |  |  |  | Sep. 18, 2017 |  |
Acquisition Type |  |  |  |  |  |  |  |  | Asset |  |
Cash paid |  |  |  |  |  |  |  |  | $ 9,144 |  |
Seller Obligations | 482 |  |  |  |  |  |  |  | 482 |  |
Total Purchase Price |  |  |  |  |  |  |  |  | 9,626 |  |
Revenue |  |  |  |  |  |  |  |  | 1,829 |  |
Net Income (Loss) |  |  |  |  |  |  |  |  | $ 11 |  |
Other Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition Type |  |  |  |  |  |  |  |  | Asset | Asset | Asset
Cash paid |  |  |  |  |  |  |  |  | $ 15,645 | $ 18,753 | $ 16,040
Seller Obligations | $ 2,419 |  |  |  | 2,299 |  |  |  | 2,419 | 2,299 | 1,621
Total Purchase Price |  |  |  |  |  |  |  |  | 18,064 | 21,052 | 17,661
Revenue |  |  |  |  |  |  |  |  | 20,457 | 19,974 | 6,349
Net Income (Loss) |  |  |  |  |  |  |  |  | 573 | $ (592) | $ (97)
2017 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 144,402 |  |
Net Income (Loss) |  |  |  |  |  |  |  |  | $ (478) |  |
Alpine Insulation Co Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Date |  |  |  |  |  |  |  |  |  | Apr. 12, 2016 |
Acquisition Type |  |  |  |  |  |  |  |  |  | Asset |
Cash paid |  |  |  |  |  |  |  |  |  | $ 21,151 |
Seller Obligations |  |  |  |  | 1,560 |  |  |  |  | 1,560 |
Total Purchase Price |  |  |  |  |  |  |  |  |  | 22,711 |
Revenue |  |  |  |  |  |  |  |  |  | 21,359 |
Net Income (Loss) |  |  |  |  |  |  |  |  |  | $ 1,370 |
East Coast Insulators II, L.L.C [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Date |  |  |  |  |  |  |  |  |  | Oct. 17, 2016 |
Acquisition Type |  |  |  |  |  |  |  |  |  | Asset |
Cash paid |  |  |  |  |  |  |  |  |  | $ 15,589 |
Seller Obligations |  |  |  |  | $ 600 |  |  |  |  | 600 |
Total Purchase Price |  |  |  |  |  |  |  |  |  | 16,189 |
Revenue |  |  |  |  |  |  |  |  |  | 4,701 |
Net Income (Loss) |  |  |  |  |  |  |  |  |  | 21 |
2016 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 46,034 |
Net Income (Loss) |  |  |  |  |  |  |  |  |  | $ 799 |
BDI Insulation [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Date |  |  |  |  |  |  |  |  |  |  | Mar. 12, 2015
Acquisition Type |  |  |  |  |  |  |  |  |  |  | Stock
Cash paid |  |  |  |  |  |  |  |  |  |  | $ 30,680
Seller Obligations |  |  |  |  |  |  |  |  |  |  | 5,765
Total Purchase Price |  |  |  |  |  |  |  |  |  |  | 36,445
Revenue |  |  |  |  |  |  |  |  |  |  | 32,505
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  | $ 2,023
CQ Insulation [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Date |  |  |  |  |  |  |  |  |  |  | Apr. 06, 2015
Acquisition Type |  |  |  |  |  |  |  |  |  |  | Stock
Cash paid |  |  |  |  |  |  |  |  |  |  | $ 5,193
Seller Obligations |  |  |  |  |  |  |  |  |  |  | 2,319
Total Purchase Price |  |  |  |  |  |  |  |  |  |  | 7,512
Revenue |  |  |  |  |  |  |  |  |  |  | 7,839
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  | $ 556
Layman Brothers Contracting [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Date |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2015
Acquisition Type |  |  |  |  |  |  |  |  |  |  | Asset
Cash paid |  |  |  |  |  |  |  |  |  |  | $ 9,088
Seller Obligations |  |  |  |  |  |  |  |  |  |  | 600
Total Purchase Price |  |  |  |  |  |  |  |  |  |  | 9,688
Revenue |  |  |  |  |  |  |  |  |  |  | 8,211
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  | $ 516
Eastern Contractor Services [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Date |  |  |  |  |  |  |  |  |  |  | Aug. 10, 2015
Acquisition Type |  |  |  |  |  |  |  |  |  |  | Stock
Cash paid |  |  |  |  |  |  |  |  |  |  | $ 24,199
Seller Obligations |  |  |  |  |  |  |  |  |  |  | 2,875
Total Purchase Price |  |  |  |  |  |  |  |  |  |  | 27,074
Revenue |  |  |  |  |  |  |  |  |  |  | 7,368
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  | 312
2015 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 62,272
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  | $ 3,310

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