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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |  |
Cash paid |  |  | $ 18,626 | $ 118,080
Seller Obligations | $ 3,799 | $ 2,627 | 3,799 | 2,627
Fair Value of Common Stock Issued |  | 10,859 |  | 10,859
Total Purchase Price |  |  | 22,425 | 131,566
Revenue | 332,584 | 282,196 | 634,312 | 537,865
Net income | 16,315 | 11,973 | $ 22,709 | $ 18,337
CDG Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date |  |  | Mar. 19, 2018 |
Acquisition Type |  |  | Asset |
Cash paid |  |  | $ 9,440 |
Seller Obligations | 1,973 |  | 1,973 |
Total Purchase Price |  |  | 11,413 |
Revenue | 3,324 |  | 3,724 |
Net income | 80 |  | $ 65 |
Other Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date |  |  | Jan. 15, 2018 |
Acquisition Type |  |  | Asset | Asset
Cash paid |  |  | $ 9,186 | $ 5,502
Seller Obligations | 1,826 | 400 | 1,826 | 400
Total Purchase Price |  |  | 11,012 | 5,902
Revenue | 4,508 | 4,654 | 5,779 | 5,172
Net income | 315 | 261 | 381 | $ 282
2018 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | 7,832 |  | 9,503 |
Net income | 395 |  | 446 |
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 | $ 10,900 | 10,859 | $ 10,900 | 10,859
Total Purchase Price |  |  |  | 116,671
Revenue |  | 30,330 |  | 58,495
Net income |  | 157 |  | 461
2017 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  | 35,200 |  | 63,883
Net income |  | 425 |  | $ 750
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 |  | 216 |  | 216
Net income |  | $ 7 |  | $ 7

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