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Business Combinations - Acquisitions Accounted for Business Combinations (Detail) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014
Business Combination, Separately Recognized Transactions [Line Items] |  |
Cash Paid | $ 109,926 | $ 720,100
Other Payable | 995 |
Recorded Earn-Out Payable | 29,496 |
Net Assets Acquired | 140,417 |
Maximum Potential Earn- Out Payable | 53,079 |
Liberty Insurance Brokers, Inc. and Affiliates (Liberty) |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | $ 14,981 |
Liberty Insurance Brokers, Inc. and Affiliates (Liberty) | Retail |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Effective Date of Acquisition | Feb. 01, 2015 |
Cash Paid | $ 12,000 |
Other Payable | 0 |
Recorded Earn-Out Payable | 2,981 |
Net Assets Acquired | 14,981 |
Maximum Potential Earn- Out Payable | 3,750 |
Spain Agency, Inc. |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | $ 23,323 |
Spain Agency, Inc. | Retail |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Effective Date of Acquisition | Mar. 01, 2015 |
Cash Paid | $ 20,706 |
Other Payable | 0 |
Recorded Earn-Out Payable | 2,617 |
Net Assets Acquired | 23,323 |
Maximum Potential Earn- Out Payable | 9,162 |
Bellingham Underwriters, Inc. [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | $ 12,829 |
Bellingham Underwriters, Inc. [Member] | National Programs |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Effective Date of Acquisition | May 01, 2015 |
Bellingham Underwriters, Inc. [Member] | National Programs Divisions [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Cash Paid | $ 9,007 |
Other Payable | 500 |
Recorded Earn-Out Payable | 3,322 |
Net Assets Acquired | 12,829 |
Maximum Potential Earn- Out Payable | 4,400 |
Fitness Insurance, LLC [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | $ 11,841 |
Fitness Insurance, LLC [Member] | Retail |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Effective Date of Acquisition | Jun. 01, 2015 |
Cash Paid | $ 9,455 |
Other Payable | 0 |
Recorded Earn-Out Payable | 2,386 |
Net Assets Acquired | 11,841 |
Maximum Potential Earn- Out Payable | 3,500 |
Other |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | 64,441 |
Other | Retail |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Cash Paid | 49,600 |
Other Payable | 400 |
Recorded Earn-Out Payable | 14,441 |
Net Assets Acquired | 64,441 |
Maximum Potential Earn- Out Payable | $ 26,000 |
Other | Wholesale Brokerage |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Effective Date of Acquisition | Jun. 01, 2015 |
Other Acquisitions [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | $ 13,002 |
Other Acquisitions [Member] | Various |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Cash Paid | 9,158 |
Other Payable | 95 |
Recorded Earn-Out Payable | 3,749 |
Net Assets Acquired | 13,002 |
Maximum Potential Earn- Out Payable | $ 6,267 |

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