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Business Combinations - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |
Intangibles | $ 76,800 | $ 30,300 |
Goodwill | 155,466 | 107,086 | $ 90,512
Gain on bargain purchase |  |  | (1,116)
Less seller obligations | 5,128 | 4,459 | 13,180
Cash paid | 137,367 | 55,493 | 85,200
Alpha [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash | 247 |  |
Accounts receivable | 29,851 |  |
Inventories | 1,852 |  |
Other current assets | 4,500 |  |
Property and equipment | 1,528 |  |
Intangibles | 57,200 |  |
Goodwill | 38,511 |  |
Other non-current assets | 383 |  |
Accounts payable and other current liabilities | (17,401) |  |
Fair value of assets acquired | 116,671 |  |
Less fair value of common stock issued | 10,859 |  |
Less seller obligations | 2,002 |  |
Cash paid | 103,810 |  |
Columbia [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 1,004 |  |
Inventories | 704 |  |
Other current assets | 8 |  |
Property and equipment | 659 |  |
Intangibles | 4,760 |  |
Goodwill | 2,184 |  |
Other non-current assets | 32 |  |
Accounts payable and other current liabilities | (358) |  |
Fair value of assets acquired | 8,993 |  |
Less seller obligations | 225 |  |
Cash paid | 8,768 |  |
Astro [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 924 |  |
Inventories | 296 |  |
Other current assets | 36 |  |
Property and equipment | 640 |  |
Intangibles | 5,168 |  |
Goodwill | 2,926 |  |
Accounts payable and other current liabilities | (364) |  |
Fair value of assets acquired | 9,626 |  |
Less seller obligations | 482 |  |
Cash paid | 9,144 |  |
Other Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 3,195 | 2,502 | 4,093
Inventories | 1,544 | 1,183 | 720
Other current assets | 96 | 24 | 32
Property and equipment | 1,820 | 1,616 | 1,574
Intangibles | 9,688 | 11,067 | 10,534
Goodwill | 4,106 | 5,933 | 4,809
Other non-current assets | 234 | 345 | 60
Accounts payable and other current liabilities | (2,619) | (1,618) | (2,220)
Deferred income tax liabilities |  |  | (825)
Fair value of assets acquired | 18,064 | 21,052 | 18,777
Gain on bargain purchase |  |  | (1,116)
Total purchase price |  |  | 17,661
Less seller obligations | 2,419 | 2,299 | 1,621
Cash paid | 15,645 | 18,753 | 16,040
Combined Business Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash | 247 | 2,181 | 926
Accounts receivable | 34,974 | 9,554 | 14,264
Inventories | 4,396 | 2,215 | 2,454
Other current assets | 4,640 | 25 | 548
Property and equipment | 4,647 | 2,938 | 4,867
Intangibles | 76,816 | 30,267 | 55,365
Goodwill | 47,727 | 16,921 | 37,104
Other non-current assets | 649 | 461 | 4,118
Accounts payable and other current liabilities | (20,742) | (4,610) | (9,773)
Deferred income tax liabilities |  |  | (6,320)
Long-term debt |  |  | (82)
Other long-term liabilities |  |  | (3,975)
Fair value of assets acquired | 153,354 | 59,952 | 99,496
Gain on bargain purchase |  |  | (1,116)
Less fair value of common stock issued | 10,859 |  |
Total purchase price |  |  | 98,380
Less seller obligations | 5,128 | 4,459 | 13,180
Cash paid | $ 137,367 | 55,493 | 85,200
Alpine [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable |  | 3,959 |
Inventories |  | 700 |
Property and equipment |  | 656 |
Intangibles |  | 12,800 |
Goodwill |  | 6,642 |
Accounts payable and other current liabilities |  | (2,046) |
Fair value of assets acquired |  | 22,711 |
Less seller obligations |  | 1,560 |
Cash paid |  | 21,151 |
East Coast Insulators II, L.L.C [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  | 2,181 |
Accounts receivable |  | 3,093 |
Inventories |  | 332 |
Other current assets |  | 1 |
Property and equipment |  | 666 |
Intangibles |  | 6,400 |
Goodwill |  | 4,346 |
Other non-current assets |  | 116 |
Accounts payable and other current liabilities |  | (946) |
Fair value of assets acquired |  | 16,189 |
Less seller obligations |  | 600 |
Cash paid |  | $ 15,589 |
BDI Insulation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  |  | 661
Accounts receivable |  |  | 4,735
Inventories |  |  | 980
Other current assets |  |  | 368
Property and equipment |  |  | 1,006
Intangibles |  |  | 21,280
Goodwill |  |  | 16,213
Other non-current assets |  |  | 3,736
Accounts payable and other current liabilities |  |  | (3,303)
Deferred income tax liabilities |  |  | (5,495)
Other long-term liabilities |  |  | (3,736)
Fair value of assets acquired |  |  | 36,445
Total purchase price |  |  | 36,445
Less seller obligations |  |  | 5,765
Cash paid |  |  | 30,680
CQ Insulation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  |  | 100
Accounts receivable |  |  | 1,423
Inventories |  |  | 152
Other current assets |  |  | 39
Property and equipment |  |  | 190
Intangibles |  |  | 4,350
Goodwill |  |  | 3,035
Accounts payable and other current liabilities |  |  | (1,539)
Other long-term liabilities |  |  | (238)
Fair value of assets acquired |  |  | 7,512
Total purchase price |  |  | 7,512
Less seller obligations |  |  | 2,319
Cash paid |  |  | 5,193
Layman Brothers Contracting [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable |  |  | 1,245
Inventories |  |  | 267
Property and equipment |  |  | 733
Intangibles |  |  | 5,330
Goodwill |  |  | 3,143
Accounts payable and other current liabilities |  |  | (1,030)
Fair value of assets acquired |  |  | 9,688
Total purchase price |  |  | 9,688
Less seller obligations |  |  | 600
Cash paid |  |  | 9,088
Eastern Contractor Services [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  |  | 165
Accounts receivable |  |  | 2,768
Inventories |  |  | 335
Other current assets |  |  | 109
Property and equipment |  |  | 1,364
Intangibles |  |  | 13,871
Goodwill |  |  | 9,904
Other non-current assets |  |  | 322
Accounts payable and other current liabilities |  |  | (1,681)
Long-term debt |  |  | (82)
Other long-term liabilities |  |  | (1)
Fair value of assets acquired |  |  | 27,074
Total purchase price |  |  | 27,074
Less seller obligations |  |  | 2,875
Cash paid |  |  | $ 24,199

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