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Condensed Consolidating Financial Information (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Assets	$ 4,426,784us-gaap_Assets		$ 4,478,924us-gaap_Assets
Net loss	35,103us-gaap_ProfitLoss	(11,225)us-gaap_ProfitLoss
Net Cash Provided by (Used in) Operating Activities	59,638us-gaap_NetCashProvidedByUsedInOperatingActivities	57,169us-gaap_NetCashProvidedByUsedInOperatingActivities
Senior Notes | 9.125% Senior Notes Due 2018
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		9.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = byd_SeniorNotesDue2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior Notes | 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = byd_SeniorNotesDue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Parent
Debt Instrument [Line Items]
Assets	3,522,689us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		3,457,936us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net loss		(6,182)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Cash Provided by (Used in) Operating Activities	(26,888)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(20,187)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Parent | Senior Notes | 9.125% Senior Notes Due 2018
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.13%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = byd_SeniorNotesDue2018Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		9.13%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = byd_SeniorNotesDue2018Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Parent | Senior Notes | 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = byd_SeniorNotesDue2020Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember		9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = byd_SeniorNotesDue2020Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Guarantor Subsidiaries
Debt Instrument [Line Items]
Assets	4,430,704us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember		4,390,771us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net loss		36,165us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net Cash Provided by (Used in) Operating Activities	75,990us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember	68,688us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Non-Guarantor Subsidiaries (100% Owned)
Debt Instrument [Line Items]
Assets	1,530,664us-gaap_Assets / dei_LegalEntityAxis = byd_NonGuarantorSubsidiariesWhollyOwnedMember		1,545,428us-gaap_Assets / dei_LegalEntityAxis = byd_NonGuarantorSubsidiariesWhollyOwnedMember
Net loss		(10,040)us-gaap_ProfitLoss / dei_LegalEntityAxis = byd_NonGuarantorSubsidiariesWhollyOwnedMember
Net Cash Provided by (Used in) Operating Activities	5,730us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = byd_NonGuarantorSubsidiariesWhollyOwnedMember	14,670us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = byd_NonGuarantorSubsidiariesWhollyOwnedMember
Non-Guarantor Subsidiaries (Not 100% Owned)
Debt Instrument [Line Items]
Assets	219us-gaap_Assets / dei_LegalEntityAxis = byd_NonGuarantorSubsidiariesLessThanWhollyOwnedMember		219us-gaap_Assets / dei_LegalEntityAxis = byd_NonGuarantorSubsidiariesLessThanWhollyOwnedMember
Net loss		(10,169)us-gaap_ProfitLoss / dei_LegalEntityAxis = byd_NonGuarantorSubsidiariesLessThanWhollyOwnedMember
Net Cash Provided by (Used in) Operating Activities	(41)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = byd_NonGuarantorSubsidiariesLessThanWhollyOwnedMember	(2,942)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = byd_NonGuarantorSubsidiariesLessThanWhollyOwnedMember
Eliminations
Debt Instrument [Line Items]
Assets	(5,057,492)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember		(4,915,430)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net loss		(20,999)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net Cash Provided by (Used in) Operating Activities	$ 4,847us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	$ (3,060)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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