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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |
Seller Obligations |  |  | $ 5,420 | $ 3,759
Revenue | $ 348,999 | $ 295,193 | 983,311 | 833,058
Net income | 15,563 | 12,010 | $ 38,272 | $ 30,347
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 | 3,848 |  | 7,572 |
Net income | 164 |  | $ 229 |
Other Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition Type |  |  | Shares/Asset | Asset
Cash paid |  |  | $ 25,242 | $ 9,812
Seller Obligations |  |  | 3,447 | 1,042
Total Purchase Price |  |  | 28,689 | 10,854
Revenue | 7,003 | 6,499 | 12,782 | 11,671
Net income | 42 | 84 | 423 | 366
Combined Business Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid |  |  | 34,682 | 131,534
Seller Obligations |  |  | 5,420 | 3,751
Fair Value of Common Stock Issued |  | 10,859 |  | 10,859
Total Purchase Price |  |  | 40,102 | $ 146,144
2018 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | 10,851 |  | 20,354 |
Net income | 206 |  | 652 |
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 | $ 10,900 | 10,859
Total Purchase Price |  |  |  | 116,671
Revenue |  | 29,334 |  | 87,830
Net income |  | (271) |  | $ 190
Columbia [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date |  |  |  | Jun. 26, 2017
Acquisition Type |  |  |  | Asset
Cash paid |  |  |  | $ 8,768
Seller Obligations |  |  |  | 225
Total Purchase Price |  |  |  | 8,993
Revenue |  | 3,026 |  | 3,241
Net income |  | 73 |  | 80
2017 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  | 39,123 |  | 103,006
Net income |  | (68) |  | $ 682
Astro [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date |  |  |  | Sep. 18, 2017
Acquisition Type |  |  |  | Asset
Cash paid |  |  |  | $ 9,144
Seller Obligations |  |  |  | 482
Total Purchase Price |  |  |  | 9,626
Revenue |  | 264 |  | 264
Net income |  | $ 46 |  | $ 46

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