v2.4.0.6

Fair Value Measurements (Narrative) (Details) (USD $) |  | 0 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 Fair Value, Measurements, Recurring Carrying Value | Dec. 20, 2011 Kansas Star | Dec. 31, 2012 Earnout on Excess of EBITDA in 2015 Kansas Star | Dec. 31, 2012 Peninsula Gaming | Nov. 20, 2012 Peninsula Gaming
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investment available for sale | $ 22,400,000 |  |  |  |
Debt security, interest rate | 7.50% |  |  |  |
Earnout threshhold, EBITDA of certain properties |  |  | 105,000,000 |  |
Earnout multiple |  |  | 7.5 |  |
Contingent consideration - Kansas Star earn out |  |  |  |  | 9,800,000
Payment to option holder, percentage of EBITDA |  | 1.00% |  |  |
Payment to option holder, term |  | 10 years |  |  |
Contingent consideration, liability for payments to option holder, current |  |  |  | 900,000 |
Contingent consideration, liability for payments to option holder, noncurrent |  |  |  | $ 3,600,000 |

X
- Definition Business Combination, Contingent Consideration Arrangements, Earnout Multiple + References No definition available. + Details
Name: | byd_BusinessCombinationContingentConsiderationArrangementsEarnoutMultiple
Namespace Prefix: | byd_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Business Combination, Contingent Consideration Arrangements, Earnout Threshold, EBITDA of Certain Properties + References No definition available. + Details
Name: | byd_BusinessCombinationContingentConsiderationArrangementsEarnoutThresholdEbitdaOfCertainProperties
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business Combination, Contingent Consideration Arrangements, Payment to Option Holder, Percentage of EBITDA + References No definition available. + Details
Name: | byd_BusinessCombinationContingentConsiderationArrangementsPaymentToOptionHolderPercentageOfEbitda
Namespace Prefix: | byd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Business Combination, Contingent Consideration Arrangements, Payment to Option Holder, Term + References No definition available. + Details
Name: | byd_BusinessCombinationContingentConsiderationArrangementsPaymentToOptionHolderTerm
Namespace Prefix: | byd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Business Combination, Contingent Consideration, Liability for Merger Earnout + References No definition available. + Details
Name: | byd_BusinessCombinationContingentConsiderationLiabilityForMergerEarnout
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Current + References No definition available. + Details
Name: | byd_BusinessCombinationContingentConsiderationLiabilityForPaymentsToOptionHolderCurrent
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Noncurrent + References No definition available. + Details
Name: | byd_BusinessCombinationContingentConsiderationLiabilityForPaymentsToOptionHolderNoncurrent
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Security, Interest Rate, Stated Percentage + References No definition available. + Details
Name: | byd_DebtSecurityInterestRateStatedPercentage
Namespace Prefix: | byd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
Name: | us-gaap_AvailableForSaleSecuritiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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