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Fair Value Measurements (Fair Value, by Balance Sheet Grouping) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Parent | Level 3 | Fair Value, Measurements, Nonrecurring [Member] | Outstanding Face Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Obligation Under Assessment Arrangements	$ 36,292,000us-gaap_CommitmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = byd_OutstandingFaceAmountMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 36,749,000us-gaap_CommitmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = byd_OutstandingFaceAmountMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Financial Instruments	300,000byd_OtherFinancialInstrumentsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = byd_OutstandingFaceAmountMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	300,000byd_OtherFinancialInstrumentsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = byd_OutstandingFaceAmountMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Parent | Level 3 | Fair Value, Measurements, Nonrecurring [Member] | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Obligation Under Assessment Arrangements	28,323,000us-gaap_CommitmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	28,612,000us-gaap_CommitmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Financial Instruments	273,000byd_OtherFinancialInstrumentsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	268,000byd_OtherFinancialInstrumentsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Parent | Level 3 | Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Obligation Under Assessment Arrangements	29,110,000us-gaap_CommitmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	29,529,000us-gaap_CommitmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Financial Instruments	273,000byd_OtherFinancialInstrumentsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	268,000byd_OtherFinancialInstrumentsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Peninsula Gaming
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment available for sale	18,300,000us-gaap_AvailableForSaleSecurities / us-gaap_BusinessAcquisitionAxis = byd_PeninsulaGamingMember	18,000,000us-gaap_AvailableForSaleSecurities / us-gaap_BusinessAcquisitionAxis = byd_PeninsulaGamingMember
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Current	900,000byd_BusinessCombinationContingentConsiderationLiabilityForPaymentsToOptionHolderCurrent / us-gaap_BusinessAcquisitionAxis = byd_PeninsulaGamingMember	900,000byd_BusinessCombinationContingentConsiderationLiabilityForPaymentsToOptionHolderCurrent / us-gaap_BusinessAcquisitionAxis = byd_PeninsulaGamingMember
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Noncurrent	$ 2,900,000byd_BusinessCombinationContingentConsiderationLiabilityForPaymentsToOptionHolderNoncurrent / us-gaap_BusinessAcquisitionAxis = byd_PeninsulaGamingMember	$ 2,900,000byd_BusinessCombinationContingentConsiderationLiabilityForPaymentsToOptionHolderNoncurrent / us-gaap_BusinessAcquisitionAxis = byd_PeninsulaGamingMember

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- Definition

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Section 45

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Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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