XML 66 R54.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Losses and Loss Adjustment Reserve - Additional Information (Detail) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 USD ($) Reinsurer | Dec. 31, 2016 USD ($)
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded rate of premiums under insurance program | 100.00% |
Premiums written net | $ 462,710,000 |
Ceded unpaid loss | 2,160,300,000 |
Prepaid reinsurance premiums | 332,246,000 | $ 308,661,000
Increase (Decrease) in Loss and Loss Adjustment Expense Reserve | 0 |
Reserve for losses and loss adjustment expense | $ 2,160,300,000 |
Number of reinsurers | Reinsurer | 2 |
Wright Flood |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded rate of premiums under insurance program | 100.00% |
Expenses and allowance rate received in premiums | 30.90% |
Premiums written net | $ 461,500,000 |
Wright Flood | Quota Share Agreement |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Effective cedes rate under quota share agreement | 100.00% |
Commission rate, percent of ceded written premiums | 30.50% |
Ceded amount | $ 1,200,000 |

X
- Definition Number of reinsurers. + References No definition available. + Details
Name: | bro_NumberOfReinsurers
Namespace Prefix: | bro_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of ceded premiums. + References No definition available. + Details
Name: | bro_PercentageOfCededPremiums
Namespace Prefix: | bro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of flood premiums ceded. + References No definition available. + Details
Name: | bro_PercentageOfFloodPremiumsCeded
Namespace Prefix: | bro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of reinsurance recoverables allowance. + References No definition available. + Details
Name: | bro_PercentageOfReinsuranceRecoverablesAllowance
Namespace Prefix: | bro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Reinsurance percentage of ceding commission. + References No definition available. + Details
Name: | bro_ReinsurancePercentageOfCedingCommission
Namespace Prefix: | bro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Reserve For Losses And Loss Adjustment Expenses For Reinsurance Liability + References No definition available. + Details
Name: | bro_ReserveForLossesAndLossAdjustmentExpensesForReinsuranceLiability
Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
Name: | us-gaap_CededPremiumsWritten
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The unexpired portion of premiums ceded on policies in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prepaid Reinsurance Premiums -URI http://asc.fasb.org/extlink&oid=6521719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 340 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485982&loc=d3e22818-158507 + Details
Name: | us-gaap_PrepaidReinsurancePremiums
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 + Details
Name: | us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_ReinsuranceRecoverables
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_SubsegmentsAxis=bro_WrightNationalFloodInsuranceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=bro_QuotaShareAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |