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Acquisitions - Narrative (Detail) - USD ($) $ in Thousands |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 29, 2017 | Aug. 02, 2017 | May 30, 2017 | May 31, 2016 | Nov. 16, 2015 | May 29, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  |  |  |  |  |  | $ 11,344 | $ 9,394 | $ 339,961
Radio 1033, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total purchase price to acquire business | $ 1,400 |  |  |  |  |  |  |  |
Digital Health Department, Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total purchase price to acquire business |  | $ 3,900 |  |  |  |  |  |  |
Modria.com |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total purchase price to acquire business |  |  | $ 7,000 |  |  |  |  |  |
Cash to acquire business |  |  | $ 6,100 |  |  |  |  |  |
Accrued amount from business acquisition |  |  |  |  |  |  | $ 900 |  |
ExecuTime Software, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total purchase price to acquire business |  |  |  | $ 7,400 |  |  |  |  |
New World Systems Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  |  |  | $ 22,500 |  |  |  |
Payments to acquire business, net of cash acquired |  |  |  |  | $ 337,500 |  |  |  |
Accrued purchase price |  |  |  |  |  |  |  | 4,000 | $ 4,000
Number of shares of equity interests issued to acquire entity |  |  |  |  | 2,100,000 |  |  |  |
Value of shares of equity interests issued to acquire entity |  |  |  |  | $ 362,800 |  |  |  |
Acquisition related fees |  |  |  |  | $ 5,900 |  |  |  |
Payment for previous acquisition |  |  |  |  |  |  |  | 2,000 |
Goodwill, purchase price adjustments |  |  |  |  |  |  |  | $ 7,400 |
Brazos Technology Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  |  |  |  | $ 312 |  |  |
Payments to acquire business, net of cash acquired |  |  |  |  |  | $ 6,100 |  |  |
Number of shares of equity interests issued to acquire entity |  |  |  |  |  | 12,500 |  |  |
Value of shares of equity interests issued to acquire entity |  |  |  |  |  | $ 1,500 |  |  |
Debt assumed in acquisition |  |  |  |  |  | $ 733 |  |  |

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