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Acquisitions - Allocated Aggregate Purchase Price of Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 416,139 | $ 384,697
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview) and Lewis Birch & Richardo, LLC (LBR) [Member] |  |
Business Acquisition [Line Items] |  |
Cash | 382 |
Accounts receivable | 3,408 |
Work in process | 900 |
Other assets | 406 |
Identifiable intangible assets | 11,109 |
Current liabilities | (3,690) |
Total identifiable net assets | 12,515 |
Goodwill | 31,925 |
Aggregate purchase price | $ 44,440 |

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