Fair Value Disclosures - Contingent Consideration Liability Change in Amount (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Change in Contingent Consideration Liability [Roll Forward]
Beginning Balance	$ 501	$ 903
Contingent Consideration from New Acquisition	6,105	454
Payment of Contingent Consideration	(310)	0
Adjustment of Contingent Consideration liability	373	(874)
Ending Balance	6,669	483
Girard Partners [Member]
Change in Contingent Consideration Liability [Roll Forward]
Beginning Balance	0
Contingent Consideration from New Acquisition	5,470
Payment of Contingent Consideration	0
Adjustment of Contingent Consideration liability	197
Ending Balance	5,667
John T. Fretz Insurance Agency [Member]
Change in Contingent Consideration Liability [Roll Forward]
Beginning Balance	501	0
Contingent Consideration from New Acquisition	0	454
Payment of Contingent Consideration	(310)	0
Adjustment of Contingent Consideration liability	154	29
Ending Balance	345	483
Sterner Insurance Associates Inc [Member]
Change in Contingent Consideration Liability [Roll Forward]
Beginning Balance	0
Contingent Consideration from New Acquisition	635
Payment of Contingent Consideration	0
Adjustment of Contingent Consideration liability	22
Ending Balance	657
Javers Group [Member]
Change in Contingent Consideration Liability [Roll Forward]
Beginning Balance		903
Contingent Consideration from New Acquisition		0
Payment of Contingent Consideration		0
Adjustment of Contingent Consideration liability		(903)
Ending Balance		$ 0