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Long-Term Debt (Boyd Senior and Senior Subordinated Notes Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Loss on early extinguishments of debt	$ 508us-gaap_GainsLossesOnExtinguishmentOfDebt	$ 154us-gaap_GainsLossesOnExtinguishmentOfDebt
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]
Loss on early extinguishments of debt	$ 0us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 0us-gaap_GainsLossesOnExtinguishmentOfDebt / 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

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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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)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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



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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 50

-Section 40

-Paragraph 4

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

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