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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Business Acquisition [Line Items] |  |
Cash paid | $ 11,505 | $ 107,212
Seller Obligations | 3,093 | 2,302
Fair Value of Common Stock Issued |  | 10,859
Total Purchase Price | 14,598 | 120,373
Revenue | 301,728 | 255,669
Net Income (Loss) | $ 6,394 | $ 6,364
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 | 400 |
Net Income (Loss) | $ (15) |
Other Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Date | Jan. 15, 2018 | Mar. 20, 2017
Acquisition Type | Asset | Asset
Cash paid | $ 2,065 | $ 3,402
Seller Obligations | 1,120 | 300
Total Purchase Price | 3,185 | 3,702
Revenue | 1,271 | 518
Net Income (Loss) | 66 | $ 21
2018 Acquisitions [Member] |  |
Business Acquisition [Line Items] |  |
Revenue | 1,671 |
Net Income (Loss) | 51 |
Alpha [Member] |  |
Business Acquisition [Line Items] |  |
Date |  | Jan. 05, 2017
Acquisition Type |  | Share
Cash paid |  | $ 103,810
Seller Obligations |  | 2,002
Fair Value of Common Stock Issued | $ 10,900 | 10,859
Total Purchase Price |  | 116,671
Revenue |  | 28,166
Net Income (Loss) |  | 900
2017 Acquisitions [Member] |  |
Business Acquisition [Line Items] |  |
Revenue |  | 28,684
Net Income (Loss) |  | $ 921

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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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