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Acquisitions (First quarter 2014) - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 Employees
Centric Insurance Agency [Member]
Business Acquisition, Contingent Consideration [Line Items]
Acquired entity, name	Centric Insurance Agency
Lewis Birch & Richardo, LLC [Member]
Business Acquisition, Contingent Consideration [Line Items]
Acquired entity, name	Lewis Birch & Richardo, LLC
Clearview National Partners, L.L.C [Member]
Business Acquisition, Contingent Consideration [Line Items]
Acquired entity, name	Clearview National Partners, LLC
Clearview National Partners, L.L.C [Member] | Minimum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Number of employees covered	100

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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