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Business Combinations - Additional Information (Detail) (USD $) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate purchase price of acquisitions | $ 93,000 |  |  |  |  |
Cash payment for acquisition | 720,102,000 | 379,694,000 |  |  |  |
Total goodwill | 506,335,000 |  |  |  |  |
Goodwill assigned | 506,306,000 |  |  |  |  |
Goodwill currently deductible for income tax purposes | 141,757,000 |  |  |  |  |
Goodwill currently non-deductible for income tax purposes | 351,641,000 |  |  |  |  |
Goodwill related to the recorded earn-out payables | 12,937,000 |  |  |  |  |
Total revenues related to acquisitions | 77,064,000 |  |  |  |  |
Income before income taxes related to acquisitions | 5,166,000 |  |  |  |  |
Estimated acquisition earn-out payables | 52,326,000 | 46,690,000 | 52,696,000 | 43,058,000 | 48,918,000 | 52,987,000
Accounts Payable [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | 19,751,000 |  |  |  |  |
Purchased customer accounts [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average life (years) | 15 years |  |  |  |  |
Non-compete agreements [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average life (years) | 3 years 3 months 18 days |  |  |  |  |
Retail [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill assigned | 71,449,000 |  |  |  |  |
National Programs [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill assigned | 427,802,000 |  |  |  |  |
Services [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill assigned | 7,323,000 |  |  |  |  |
Wholesale Brokerage [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill assigned | (239,000) |  |  |  |  |
Asset Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | 5 | 3 |  |  |  |
Stock Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | 1 | 1 |  |  |  |
Beecher Carlson Holdings, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash payment for acquisition |  | 364,200,000 |  |  |  |
Other Non-Current Liability [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | $ 32,575,000 |  |  |  |  |

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- Definition The amount of goodwill not deductible for tax purposes. + References No definition available. + Details
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- Definition Business Combination Pro Forma Information Income Loss Before Income Taxes Of Acquiree Since Acquisition Date Actual + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + 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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