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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Intangibles | $ 36,100 | $ 76,800 |
Goodwill | 173,049 | 155,466 | $ 107,086
Less seller obligations | 7,540 | 5,128 | 4,459
Cash paid |  |  | 55,493
CDG Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 1,731 |  |
Inventories | 514 |  |
Other current assets | 28 |  |
Property and equipment | 933 |  |
Intangibles | 3,711 |  |
Goodwill | 4,898 |  |
Other non-current assets | 36 |  |
Accounts payable and other current liabilities | (438) |  |
Fair value of assets acquired and purchase price | 11,413 |  |
Less seller obligations | 1,973 |  |
Cash paid | 9,440 |  |
Other Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 4,181 | 3,157 | 2,502
Inventories | 1,136 | 1,544 | 1,183
Other current assets | 918 | 96 | 24
Property and equipment | 2,169 | 1,820 | 1,616
Intangibles | 18,904 | 9,688 | 11,067
Goodwill | 7,711 | 4,190 | 5,933
Other non-current assets | 82 | 219 | 345
Accounts payable and other current liabilities | (2,451) | (2,650) | (1,618)
Fair value of assets acquired and purchase price | 32,650 | 18,064 | 21,052
Less seller obligations | 4,057 | 2,419 | 2,299
Cash paid | 28,593 | 15,645 | 18,753
Combined Business Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  | 247 | 2,181
Accounts receivable | 5,912 | 34,921 | 9,554
Inventories | 2,215 | 4,396 | 2,215
Other current assets | 946 | 4,640 | 25
Property and equipment | 5,984 | 4,647 | 2,938
Intangibles | 36,085 | 76,816 | 30,267
Goodwill | 17,024 | 47,842 | 16,921
Other non-current assets | 131 | 638 | 461
Accounts payable and other current liabilities | (3,017) | (20,793) | (4,610)
Fair value of assets acquired and purchase price | 65,280 | 153,354 | 59,952
Less fair value of common stock issued |  | 10,859 |
Less seller obligations | 7,540 | 5,128 | 4,459
Cash paid | 57,740 | 137,367 | 55,493
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 and purchase price |  | 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 |  | 989 |
Inventories |  | 704 |
Other current assets |  | 8 |
Property and equipment |  | 659 |
Intangibles |  | 4,760 |
Goodwill |  | 2,209 |
Other non-current assets |  | 36 |
Accounts payable and other current liabilities |  | (372) |
Fair value of assets acquired and purchase price |  | 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 |  | 2,932 |
Accounts payable and other current liabilities |  | (370) |
Fair value of assets acquired and purchase price |  | 9,626 |
Less seller obligations |  | 482 |
Cash paid |  | $ 9,144 |
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 and purchase price |  |  | 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 and purchase price |  |  | 16,189
Less seller obligations |  |  | 600
Cash paid |  |  | $ 15,589
AFT Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Inventories | 565 |  |
Property and equipment | 2,882 |  |
Intangibles | 13,470 |  |
Goodwill | 4,415 |  |
Other non-current assets | 13 |  |
Accounts payable and other current liabilities | (128) |  |
Fair value of assets acquired and purchase price | 21,217 |  |
Less seller obligations | 1,510 |  |
Cash paid | $ 19,707 |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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