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Acquisitions (First Quarter 2018) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, current |  | $ 21,737 | $ 22,538
Contingent consideration, non-current |  | $ 15,811 | $ 17,170
Laurus Transaction Advisors, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Feb. 01, 2018 |  |
Acquired entity, name | Laurus Transaction Advisors, LLC |  |
Consideration paid in cash | $ 15,500 |  |
Contingent consideration | 8,300 |  |
Contingent arrangements arising from acquisitions | 8,300 |  |
Contingent consideration, current | 2,200 |  |
Contingent consideration, non-current | 6,100 |  |
Annual revenue | $ 5,600 |  |

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