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Long-Term Debt (Peninsula Bank Credit Facility Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Loss on early extinguishments of debt	$ 508,000us-gaap_GainsLossesOnExtinguishmentOfDebt	$ 154,000us-gaap_GainsLossesOnExtinguishmentOfDebt
Parent
Debt Instrument [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
Debt Instrument [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 | Letter of Credit
Debt Instrument [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
Debt Instrument [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
Debt Instrument [Line Items]
Amount outstanding	5,600,000us-gaap_LineOfCredit / dei_LegalEntityAxis = byd_SubsidiaryPeninsulaGamingMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember
Swing Loan [Member] | Parent | Bank Credit Facility
Debt Instrument [Line Items]
Amount outstanding	$ 8,700,000us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = byd_SwingLoanMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember		$ 25,300,000us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = byd_SwingLoanMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

-Section S99

-Paragraph 1

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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