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Business Combinations - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Goodwill | $ 161,681 |  | $ 155,466
Less seller obligations | 3,093 | $ 2,302 |
Cash paid | 11,505 | 107,212 |
CDG Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 1,819 |  |
Inventories | 514 |  |
Other current assets | 13 |  |
Property and equipment | 933 |  |
Intangibles | 3,710 |  |
Goodwill | 4,852 |  |
Other non-current assets | 36 |  |
Accounts payable and other current liabilities | (464) |  |
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 |  | 1,087 |
Inventories | 75 | 746 |
Other current assets | 12 | 3 |
Property and equipment | 517 | 457 |
Intangibles | 1,675 | 1,904 |
Goodwill | 931 | 586 |
Other non-current assets |  | 119 |
Accounts payable and other current liabilities | (25) | (1,200) |
Fair value of assets acquired and purchase price | 3,185 | 3,702 |
Less seller obligations | 1,120 | 300 |
Cash paid | 2,065 | 3,402 |
Combined Business Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  | 247 |
Accounts receivable | 1,819 | 30,938 |
Inventories | 589 | 2,598 |
Other current assets | 25 | 4,503 |
Property and equipment | 1,450 | 1,985 |
Intangibles | 5,385 | 59,104 |
Goodwill | 5,783 | 39,097 |
Other non-current assets | 36 | 502 |
Accounts payable and other current liabilities | (489) | (18,601) |
Fair value of assets acquired and purchase price | 14,598 | 120,373 |
Less fair value of common stock issued |  | 10,859 |
Less seller obligations | 3,093 | 2,302 |
Cash paid | $ 11,505 | 107,212 |
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 |

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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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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