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Fair Value Measurements (Fair Value Balance Sheet Long-Term Debt Grouping) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Parent    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross $ 2,347,190us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 $ 2,389,165us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Long-term debt, net 2,328,609us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 2,368,988us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Parent | Outstanding Face Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 2,347,190us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= byd_OutstandingFaceAmountMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 2,389,165us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= byd_OutstandingFaceAmountMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Parent | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net 2,328,609us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 2,368,988us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Parent | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 2,392,264us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 2,416,873us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Subsidiary, Peninsula Gaming [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross 1,075,176us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember		 1,092,403us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
Long-term debt, net 1,075,176us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember		 1,092,403us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
Subsidiary, Peninsula Gaming [Member] | Outstanding Face Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 1,075,176us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= byd_OutstandingFaceAmountMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember		 1,092,403us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= byd_OutstandingFaceAmountMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
Subsidiary, Peninsula Gaming [Member] | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net 1,075,176us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember		 1,092,403us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
Subsidiary, Peninsula Gaming [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 1,095,780us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember		 1,117,492us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
Subsidiary, Peninsula Gaming [Member] | Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross   3us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= byd_OtherLongTermDebtMember
Long-term debt, net   3us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= byd_OtherLongTermDebtMember
Consolidated, Excluding Borgata [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross 3,422,366us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= byd_ConsolidatedExcludingBorgataMember		 3,481,568us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= byd_ConsolidatedExcludingBorgataMember
Long-term debt, net 3,403,785us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= byd_ConsolidatedExcludingBorgataMember		 3,461,391us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= byd_ConsolidatedExcludingBorgataMember
Consolidated, Excluding Borgata [Member] | Outstanding Face Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 3,422,366us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= byd_OutstandingFaceAmountMember
/ dei_LegalEntityAxis
= byd_ConsolidatedExcludingBorgataMember		 3,481,568us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= byd_OutstandingFaceAmountMember
/ dei_LegalEntityAxis
= byd_ConsolidatedExcludingBorgataMember
Consolidated, Excluding Borgata [Member] | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net 3,403,785us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= byd_ConsolidatedExcludingBorgataMember		 3,461,391us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= byd_ConsolidatedExcludingBorgataMember
Consolidated, Excluding Borgata [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 3,488,044us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= byd_ConsolidatedExcludingBorgataMember		 3,534,365us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= byd_ConsolidatedExcludingBorgataMember
Bank Credit Facility [Member] | Parent | Bank Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross   1,387,425us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= byd_BankCreditFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Long-term debt, net   1,383,836us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= byd_BankCreditFacilityMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Bank Credit Facility [Member] | Subsidiary, Peninsula Gaming [Member] | Bank Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross   742,400us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= byd_BankCreditFacilityMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Long-term debt, net   742,400us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= byd_BankCreditFacilityMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Peninsula Senior Notes due 2018 [Member] | Subsidiary, Peninsula Gaming [Member] | Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross   350,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= byd_PeninsulaSeniorNotesDue2018Member
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Long-term debt, net   350,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= byd_PeninsulaSeniorNotesDue2018Member
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
9.125% Senior Notes Due 2018 | Parent | Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross   500,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= byd_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Long-term debt, net   495,155us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= byd_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
9.00% Senior Notes Due 2020 | Parent | Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross   350,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= byd_SeniorNotesDue2020Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Long-term debt, net   350,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= byd_SeniorNotesDue2020Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Level 1 | Peninsula Senior Notes due 2018 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Subsidiary, Peninsula Gaming [Member] | Senior Notes | Outstanding Face Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross 350,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= byd_PeninsulaSeniorNotesDue2018Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
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= byd_OutstandingFaceAmountMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Level 1 | Peninsula Senior Notes due 2018 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Subsidiary, Peninsula Gaming [Member] | Senior Notes | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net 350,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= byd_PeninsulaSeniorNotesDue2018Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
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= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Level 1 | Peninsula Senior Notes due 2018 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Subsidiary, Peninsula Gaming [Member] | Senior Notes | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 369,250us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= byd_PeninsulaSeniorNotesDue2018Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 363,125us-gaap_DebtInstrumentFairValue
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= byd_PeninsulaSeniorNotesDue2018Member
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= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Level 1 | 9.125% Senior Notes Due 2018 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | Outstanding Face Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross 500,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= byd_SeniorNotesDue2018Member
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= us-gaap_FairValueInputsLevel1Member
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= byd_OutstandingFaceAmountMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Level 1 | 9.125% Senior Notes Due 2018 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net 495,464us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= byd_SeniorNotesDue2018Member
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= us-gaap_FairValueInputsLevel1Member
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= us-gaap_CarryingReportedAmountFairValueDisclosureMember
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= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Level 1 | 9.125% Senior Notes Due 2018 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 525,000us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= byd_SeniorNotesDue2018Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 517,500us-gaap_DebtInstrumentFairValue
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= byd_SeniorNotesDue2018Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Level 1 | 9.00% Senior Notes Due 2020 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | Outstanding Face Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross 350,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= byd_SeniorNotesDue2020Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= byd_OutstandingFaceAmountMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Level 1 | 9.00% Senior Notes Due 2020 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net 350,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= byd_SeniorNotesDue2020Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Level 1 | 9.00% Senior Notes Due 2020 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 378,875us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= byd_SeniorNotesDue2020Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 359,625us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= byd_SeniorNotesDue2020Member
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Level 2 | Bank Credit Facility [Member] | Subsidiary, Peninsula Gaming [Member] | Bank Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross 725,175us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= byd_BankCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		  
Level 2 | Bank Credit Facility [Member] | Fair Value, Measurements, Nonrecurring [Member] | Parent | Bank Credit Facility | Outstanding Face Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Gross 1,345,450us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= byd_BankCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= byd_OutstandingFaceAmountMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		  
Level 2 | Bank Credit Facility [Member] | Fair Value, Measurements, Nonrecurring [Member] | Parent | Bank Credit Facility | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net 1,342,021us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= byd_BankCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		  
Level 2 | Bank Credit Facility [Member] | Fair Value, Measurements, Nonrecurring [Member] | Parent | Bank Credit Facility | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 1,344,236us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= byd_BankCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 1,395,595us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= byd_BankCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Level 2 | Bank Credit Facility [Member] | Fair Value, Measurements, Nonrecurring [Member] | Subsidiary, Peninsula Gaming [Member] | Bank Credit Facility | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net 725,175us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= byd_BankCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		  
Level 2 | Bank Credit Facility [Member] | Fair Value, Measurements, Nonrecurring [Member] | Subsidiary, Peninsula Gaming [Member] | Bank Credit Facility | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 726,529us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= byd_BankCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 754,364us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= byd_BankCreditFacilityMember
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure 1us-gaap_DebtInstrumentFairValue
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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