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Acquisitions (First Quarter 2014) - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 Employee
Centric Insurance Agency [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Acquired entity, name | Centric Insurance Agency
Effective date of acquisition | Jan. 01, 2014
Clearview National Partners, L.L.C [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Acquired entity, name | Clearview National Partners, LLC
Effective date of acquisition | Jan. 01, 2014
Clearview National Partners, L.L.C [Member] | Minimum [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Number of employees covered | 100
Lewis Birch & Richardo, LLC [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Acquired entity, name | Lewis Birch & Richardo, LLC
Effective date of acquisition | Feb. 01, 2014

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