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Business Combinations - Acquisitions Accounted for Business Combinations (Detail) (USD $) | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Business Combination, Separately Recognized Transactions [Line Items] |  |
Cash Paid | $ 720,102,000 | $ 379,694,000
Net Assets Acquired | 734,714,000 |
The Wright Insurance Group, LLC. [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | 611,629,000 |
Pacific Resources Benefits Advisors, LLC (PacRes) [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | 98,819,000 |
Axia Strategies, Inc (Axia) [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | 11,694,000 |
Other Acquisitions [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | 12,572,000 |
2014 Acquisitions [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Cash Paid | 720,181,000 |
Other Payable | 1,596,000 |
Recorded Earn-Out Payable | 12,937,000 |
Net Assets Acquired | 734,714,000 |
Maximum Potential Earn-Out Payable | 46,228,000 |
2014 Acquisitions [Member] | The Wright Insurance Group, LLC. [Member] | National Programs Divisions [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Effective Date of Acquisition | May 01, 2014 |
Cash Paid | 610,158,000 |
Other Payable | 1,471,000 |
Net Assets Acquired | 611,629,000 |
2014 Acquisitions [Member] | Pacific Resources Benefits Advisors, LLC (PacRes) [Member] | Retail [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Effective Date of Acquisition | May 01, 2014 |
Cash Paid | 90,000,000 |
Recorded Earn-Out Payable | 8,819,000 |
Net Assets Acquired | 98,819,000 |
Maximum Potential Earn-Out Payable | 35,000,000 |
2014 Acquisitions [Member] | Axia Strategies, Inc (Axia) [Member] | Wholesale Brokerage [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Effective Date of Acquisition | May 01, 2014 |
Cash Paid | 9,870,000 |
Recorded Earn-Out Payable | 1,824,000 |
Net Assets Acquired | 11,694,000 |
Maximum Potential Earn-Out Payable | 5,200,000 |
2014 Acquisitions [Member] | Other Acquisitions [Member] | Various [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Cash Paid | 10,153,000 |
Other Payable | 125,000 |
Recorded Earn-Out Payable | 2,294,000 |
Net Assets Acquired | 12,572,000 |
Maximum Potential Earn-Out Payable | $ 6,028,000 |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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