v2.4.0.6

Summary of Significant Accounting Policies (Organization) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  | 0 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 segment entity | Dec. 31, 2012 Dania Jai-Alai acre | Mar. 04, 2013 Echelon Development acre | Dec. 31, 2012 Echelon Development acre | Dec. 31, 2012 Minimum Echelon Development | Dec. 31, 2012 Maximum Echelon Development | Feb. 22, 2013 Subsequent Event Dania Jai-Alai | Mar. 01, 2013 Subsequent Event Echelon Development acre
Organization Attributes [Line Items] |  |  |  |  |  |  |  |
Number of gaming entertainment properties | 21 |  |  |  |  |  |  |
Number of controlling interests | 1 |  |  |  |  |  |  |
Number of reportable segments | 5 |  |  |  |  |  |  |
Acres of land |  | 47 |  | 87 |  |  |  | 87
Sale of Dania Jai-Alai, price |  |  |  |  |  |  | $ 65.5 |
Expected length of time until resumption of construction |  |  |  |  | 3 years | 5 years |  |
Sale of real estate development, consideration received, gross |  |  |  |  |  |  |  | 350
Area of land sold |  |  | 87 |  |  |  |  |
Sale of real estate development, consideration received, net of consideration transferred to VIE and transaction costs |  |  |  |  |  |  |  | $ 157.0

X
- Definition Area of Land Sold + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Disposition of Real Estate Development, Consideration Received, Gross + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Disposition of Real Estate Development, Consideration Received, Net of Consideration Transferred to Variable Interest Entity, Net of Transaction Costs + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Divestiture of Business Unit, Consideration Received + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Expected Length of Time Until Resumption of Construction + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Controlling Interests Held + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Gaming Entertainment Properties + References No definition available. + Details
Name: | byd_NumberOfGamingEntertainmentProperties
Namespace Prefix: | byd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | byd_OrganizationAttributesLineItems
Namespace Prefix: | byd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of land held. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration