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Long-Term Debt (Schedule of Boyd Bank Credit Facility) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Line of Credit Facility [Line Items]      
Borrowings under Boyd Gaming bank credit facility $ 203,700us-gaap_ProceedsFromLinesOfCredit $ 188,500us-gaap_ProceedsFromLinesOfCredit  
Loss on early extinguishments of debt 508us-gaap_GainsLossesOnExtinguishmentOfDebt 154us-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
 
Bank Credit Facility | Parent      
Line of Credit Facility [Line Items]      
Amount outstanding 1,345,450us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  1,387,425us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Bank Credit Facility | Parent | Initial Term Loan      
Line of Credit Facility [Line Items]      
Amount outstanding 218,250us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= byd_InitialTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  221,375us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= byd_InitialTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Bank Credit Facility | Parent | Incremental Term Loan [Member]      
Line of Credit Facility [Line Items]      
Amount outstanding 838,500us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= byd_IncrementalTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  840,750us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= byd_IncrementalTermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Bank Credit Facility | Parent | Swing Loan [Member]      
Line of Credit Facility [Line Items]      
Amount outstanding 8,700us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= byd_SwingLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  25,300us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= byd_SwingLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Bank Credit Facility | Subsidiary, Peninsula Gaming [Member]      
Line of Credit Facility [Line Items]      
Amount outstanding $ 725,200us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= byd_SubsidiaryPeninsulaGamingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember