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Long-Term Debt (Boyd Bank Credit Facility Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Line of Credit Facility [Line Items]      
Loss on early extinguishments of debt $ 508,000us-gaap_GainsLossesOnExtinguishmentOfDebt $ 154,000us-gaap_GainsLossesOnExtinguishmentOfDebt  
Parent      
Line of Credit Facility [Line Items]      
Loss on early extinguishments of debt 0us-gaap_GainsLossesOnExtinguishmentOfDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_GainsLossesOnExtinguishmentOfDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Parent | Bank Credit Facility      
Line of Credit Facility [Line Items]      
Amount outstanding 1,345,450,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  1,387,425,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Remaining borrowing capacity     304,500,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Parent | Bank Credit Facility | Initial Term Loan      
Line of Credit Facility [Line Items]      
Amount outstanding 218,250,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= byd_InitialTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  221,375,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= byd_InitialTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Parent | Bank Credit Facility | Incremental Term Loan [Member]      
Line of Credit Facility [Line Items]      
Amount outstanding 838,500,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= byd_IncrementalTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  840,750,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= byd_IncrementalTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Parent | Letter of Credit      
Line of Credit Facility [Line Items]      
Amount outstanding 6,800,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember
   
Subsidiary, Peninsula Gaming [Member] | Bank Credit Facility      
Line of Credit Facility [Line Items]      
Amount outstanding 725,200,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Remaining borrowing capacity     32,100,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Subsidiary, Peninsula Gaming [Member] | Letter of Credit      
Line of Credit Facility [Line Items]      
Amount outstanding $ 5,600,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember