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Acquisitions (First Half 2018) - Additional Information (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($) Business | Jun. 30, 2017 USD ($) Business
Business Acquisition Contingent Consideration [Line Items] |  |
Consideration paid in cash | $ 23.4 | $ 23.7
Consideration paid in common stock | 0.9 | 2.0
Contingent consideration | 12.4 | 17.5
Contingent consideration, current | 3.4 |
Contingent consideration, non-current | 9.0 |
Annual revenue | $ 9.1 | $ 23.2
Number of businesses acquired | Business |  | 3
InR Advisory Services, LLC [Member] |  |
Business Acquisition Contingent Consideration [Line Items] |  |
Effective date of acquisition | Apr. 01, 2018 |
Acquired entity, name | InR Advisory Services, LLC |
Number of businesses acquired | Business | 2 |
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 |

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