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Acquisitions - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Business Acquisition [Line Items]
Goodwill	$ 441,316	$ 435,231
Clearview National Partners, L.L.C, Centric Insurance Agency and Lewis Birch & Richardo, LLC [Member]
Business Acquisition [Line Items]
Cash			$ 382
Accounts receivable, net			3,408
Work in process, net			900
Other assets			406
Identifiable intangible assets	2,844		11,109
Current liabilities			(3,690)
Total identifiable net assets	2,844		12,515
Goodwill	6,865		31,925
Aggregate purchase price	$ 9,709		$ 44,440

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