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Acquisitions (First Half 2017) - Additional Information (Detail) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) Business | Dec. 31, 2017 USD ($)
Business Acquisition Contingent Consideration [Line Items] |  |  |
Number of businesses acquired | Business |  | 3 |
Consideration paid in cash | $ 23,400 | $ 23,700 |
Consideration paid in common stock | 900 | 2,000 |
Contingent consideration | 12,400 | 17,500 |
Contingent consideration, current | 27,344 | 5,900 | $ 15,151
Contingent consideration, non-current | 19,184 | 11,600 | $ 22,423
Annual revenue | $ 9,100 | $ 23,200 |
C M F Associates Limited Liability Company |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |
Acquired entity, name |  | CMF Associates, LLC |
Effective date of acquisition |  | Jun. 01, 2017 |
Slaton Insurance |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |
Acquired entity, name |  | Slaton Insurance |
Effective date of acquisition |  | Jun. 01, 2017 |
Pacific Coastal Pension And Insurance Services Inc |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |
Acquired entity, name |  | Pacific Coastal Pension and Insurance Services, Inc. |
Effective date of acquisition |  | Feb. 01, 2017 |

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