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Business Combinations - Additional Information (Detail) | 3 Months Ended |  |
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Mar. 31, 2016 USD ($) acquisition customer_account | Mar. 31, 2015 USD ($) acquisition | Jan. 01, 2016 USD ($) | Jan. 01, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | acquisition | 3 | 3 |  |
Aggregate purchase price of acquisitions | $ 1,074,754 |  |  |
Payments to Acquire Businesses, Gross | 42,697,000 | $ 36,200,000 |  |
Goodwill assigned | 28,952,000 |  |  |
Goodwill currently deductible for income tax purposes | 7,023,000 |  |  |
Goodwill currently non-deductible for income tax purposes | 21,323,000 |  |  |
Goodwill related to the recorded earn-out payables | 606,000 |  |  |
Total revenues related to acquisitions | 2,527,000 |  |  |
Income before income taxes related to acquisitions | 570,000 |  |  |
Estimated acquisition earn-out payables | 69,095,000 | $ 77,709,000 | $ 78,387,000 | $ 75,283,000
Accounts payable |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | $ 23,700,000 |  |  |
Purchased customer accounts |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 15 years |  |  |
Non-compete agreements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 5 years |  |  |
Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | $ 6,704,000 |  |  |
National Programs |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | (70,000) |  |  |
Wholesale Brokerage |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | 24,000 |  |  |
Services [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | 22,294,000 |  |  |
Other non-current liability |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | $ 45,400,000 |  |  |
Business Combinations - Asset Deals [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | acquisition | 2 |  |  |
Business Combinations - Stock Deals [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | customer_account | 1 |  |  |

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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=66006027&loc=d3e16265-109275 + 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=65885119&loc=d3e1392-128463 + Details
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