v2.4.0.6

Consolidation of Certain Interests (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended |  |  |  |  | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 06, 2010 Borgata | Dec. 31, 2011 Borgata | Dec. 31, 2010 Borgata | Dec. 31, 2012 Borgata | Dec. 31, 2012 Amended Borgata | Mar. 17, 2010 Maximum Borgata | Dec. 31, 2012 Maximum Amended Borgata | Jan. 31, 2010 Borgata | Mar. 01, 2013 Echelon Development Subsequent Event | Mar. 04, 2013 Echelon Central Energy Facility Subsequent Event LVE
Consolidated Entities [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  | 50.00% |  |
Proceeds of one-time distribution from subsidiary, including priority distribution | $ 135.4 |  |  |  |  |  |  |  |  |
Proceeds of priority distribution for excess prior capital contributions to parent | 30.8 |  | 20.8 |  |  |  |  |  |  |
Sale of joint venture partner interest under regulatory settlement, time period from agreement until sale |  |  |  |  |  | 30 months | 48 months |  |  |
Sale of joint venture partner interest under regulatory settlement, initial time period under which joint venture partner controls decision to sell |  |  |  |  | 36 months | 18 months |  |  |  |
Sale of joint venture partner interest under regulatory settlement, increase in time period from agreement until sale |  |  |  |  | 18 months |  |  |  |  |
Sale of joint venture partner interest under regulatory settlement, time period before end of agreement during which divestiture trust controls decision to sell |  |  |  |  | 12 months |  |  |  |  |
Component of fair value of controlling interest, control premium |  | 72.4 |  |  |  |  |  |  |  |
Control premium, percentage applied to enterprise value members' equity |  | 10.00% |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 50.00% |  |  |  |  |  |
Sale of real estate development, consideration received, gross |  |  |  |  |  |  |  |  | 350 |
Purchase price of LVE energy center assets |  |  |  |  |  |  |  |  |  | 187.0
Sale price of LVE energy center assets |  |  |  |  |  |  |  |  |  | $ 187.0

X
- Definition Business Combination, Fair Value of Equity Interest in Acquiree, Portion Attributable to Control Premium + References No definition available. + Details
Name: | byd_BusinessCombinationFairValueOfEquityInterestInAcquireePortionAttributableToControlPremium
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | byd_ConsolidatedEntitiesLineItems
Namespace Prefix: | byd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disposition of Real Estate Development, Consideration Received, Gross + References No definition available. + Details
Name: | byd_DispositionOfRealEstateDevelopmentConsiderationReceivedGross
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds of One-Time Distribution from Subsidiary, Including Priority Distribution + References No definition available. + Details
Name: | byd_ProceedsOfOneTimeDistributionFromSubsidiaryIncludingPriorityDistribution
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds of Priority Distribution for Excess Prior Capital Contributions to Parent + References No definition available. + Details
Name: | byd_ProceedsOfPriorityDistributionForExcessPriorCapitalContributionsToParent
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sale of Joint Venture Partner Interest Under Regulatory Settlement, Increase in Time Period from Agreement until Sale + References No definition available. + Details
Name: | byd_SaleOfJointVenturePartnerInterestUnderRegulatorySettlementIncreaseInTimePeriodFromAgreementUntilSale
Namespace Prefix: | byd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sale of Joint Venture Partner Interest Under Regulatory Settlement, Initial Time Period Under Which Joint Venture Partner Controls Decision to Sell + References No definition available. + Details
Name: | byd_SaleOfJointVenturePartnerInterestUnderRegulatorySettlementInitialTimePeriodUnderWhichJointVenturePartnerControlsDecisionToSell
Namespace Prefix: | byd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sale of Joint Venture Partner Interest Under Regulatory Settlement, Time Period Before End of Agreement During Which Divestiture Trust Controls Decision to Sell + References No definition available. + Details
Name: | byd_SaleOfJointVenturePartnerInterestUnderRegulatorySettlementTimePeriodBeforeEndOfAgreementDuringWhichDivestitureTrustControlsDecisionToSell
Namespace Prefix: | byd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sale of Joint Venture Partner Interest Under Regulatory Settlement, Time Period from Agreement until Sale + References No definition available. + Details
Name: | byd_SaleOfJointVenturePartnerInterestUnderRegulatorySettlementTimePeriodFromAgreementUntilSale
Namespace Prefix: | byd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -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. + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage above current market value that an investor seeking to acquire control of a company will pay, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsControlPremium
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -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. + Details
Name: | us-gaap_PaymentsToAcquireProductiveAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph c -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfProductiveAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration