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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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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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