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Employee Savings Plan (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Employee Savings Plan [Abstract] |  |  |
Compensation and Employee Benefit Plans [Text Block] | Employee Savings Plan The Company has an Employee Savings Plan (401(k)) in which substantially all employees with more than 30 days of service are eligible to participate. Under this plan, Brown & Brown makes matching contributions of up to 4.0% of each participant’s annual compensation. Prior to 2014, the Company’s matching contribution was up to 2.5% of each participant’s annual compensation with a discretionary profit-sharing contribution each year, which equaled 1.5% of each eligible employee’s compensation. The Company’s contributions to the plan totaled $17.8 million in 2015, $15.8 million in 2014, and $14.8 million in 2013. |  |
Service Period Eligible to Participate for Employee Savings Plan | $ 30 |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 4.00% |  | 2.50%
Discretionary Profit Sharing Contribution Percentage of Employees Salary | 1.50% |  |
Defined Benefit Plan, Contributions by Employer | $ 17,800,000 | $ 15,800,000 | $ 14,800,000

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- Definition Employee Savings Plan [Abstract] + References No definition available. + Details
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- Definition Service Period Eligible to Participate for Employee Savings Plan + References No definition available. + Details
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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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