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Fixed Assets - Summary of Fixed Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Furniture, fixtures and equipment	$ 161,539us-gaap_FurnitureAndFixturesGross	$ 149,170us-gaap_FurnitureAndFixturesGross
Leasehold improvements	30,030us-gaap_LeaseholdImprovementsGross	21,231us-gaap_LeaseholdImprovementsGross
Land, buildings and improvements	3,739bro_LandBuildingsAndImprovements	3,815bro_LandBuildingsAndImprovements
Total cost	195,308us-gaap_PropertyPlantAndEquipmentGross	174,216us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization	(110,640)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(99,483)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total	$ 84,668us-gaap_PropertyPlantAndEquipmentNet	$ 74,733us-gaap_PropertyPlantAndEquipmentNet

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- Definition

Land, buildings and improvements.

+ References

No definition available.

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Section S99

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- Definition

Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

+ References

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- Definition

Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

+ References

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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