v2.4.0.6

Long-Term Debt (Peninsula Bank Credit Facility Narrative) (Details) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Parent | Bank Credit Facility |  |
Debt Instrument [Line Items] |  |
Interest rate at period end | 4.20% |
Amount outstanding, gross | $ 1,450,000,000 |
Amount outstanding | 1,437,695,000 | 1,466,635,000
Remaining borrowing capacity | 278,398,000 |
Parent | Letter of Credit |  |
Debt Instrument [Line Items] |  |
Amount outstanding | 8,500,000 |
Subsidiary, Peninsula Gaming [Member] | Bank Credit Facility |  |
Debt Instrument [Line Items] |  |
Interest rate at period end | 5.70% |
Amount outstanding, gross | 843,700,000 |
Remaining borrowing capacity | 23,400,000 |
Subsidiary, Peninsula Gaming [Member] | Letter of Credit |  |
Debt Instrument [Line Items] |  |
Amount outstanding | $ 5,800,000 |

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- Definition Line of Credit Facility, Amount Outstanding, Gross + References No definition available. + Details
Name: | byd_LineOfCreditFacilityAmountOutstandingGross
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The effective interest rate at the end of the reporting period. + 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 + Details
Name: | us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant