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Acquisitions - Additional Information (Detail) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) Client_List shares | Jun. 30, 2018 USD ($) Business Client_List shares | Dec. 31, 2018 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash |  | $ 23,400 |
Contingent consideration |  | 12,400 |
Contingent consideration, current | $ 18,824 | 3,400 | $ 22,538
Contingent consideration, non-current | 9,181 | 9,000 | 17,170
Annual revenue |  | $ 9,100 |
Number of businesses acquired | Business |  | 2 |
Consideration paid in common stock |  | $ 900 |
Goodwill | 566,009 |  | $ 564,300
Changes in fair value of contingent consideration | (200) | 3,100 |
Consideration paid in cash | $ 11,300 | $ 4,100 |
Number of common stock issued | shares | 98,000 | 56,000 |
Wenner Group, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Jan. 01, 2019 |  |
Acquired entity, name | Wenner Group, LLC |  |
Consideration paid in cash | $ 1,300 |  |
Contingent consideration | 1,800 |  |
Contingent consideration, current | 600 |  |
Contingent consideration, non-current | 1,200 |  |
Annual revenue | 2,400 |  |
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 |
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 |
InR Advisory Services, LLC (“InR”) and Laurus Transaction Advisors, LLC (“Laurus”) [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | $ 2,165 | $ 32,255 |
Acquisition of Client Lists [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client lists purchased | Client_List | 0 | 0 |
Previous Client List Purchases [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 400 | $ 500 |

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