v2.4.0.6

Assets Held for Development (Summary) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Assets Held for Development [Line Items] |  |
Total assets held for development, net of impairment | $ 331,770 | $ 1,089,819
Land | Echelon Infrastructure |  |
Assets Held for Development [Line Items] |  |
Assets held for development | 453,013 | 215,969
Construction and Development Costs | Echelon Infrastructure |  |
Assets Held for Development [Line Items] |  |
Assets held for development | 499,842 | 500,787
Construction and Development Costs | Echelon Central Energy Facility |  |
Assets Held for Development [Line Items] |  |
Assets held for development | 163,519 | 163,806
Project Management and Other Costs | Echelon Infrastructure |  |
Assets Held for Development [Line Items] |  |
Assets held for development | 115,712 | 115,712
Professional and Design Fees | Echelon Infrastructure |  |
Assets Held for Development [Line Items] |  |
Assets held for development | 93,545 | 93,545
Echelon Development |  |
Assets Held for Development [Line Items] |  |
Assets held for development | 1,325,631 | 1,089,819
Impairment | 993,861 | 0
Total assets held for development, net of impairment | $ 331,770 | $ 1,089,819

X
- Definition Assets Held for Development + References No definition available. + Details
Name: | byd_AssetsHeldForDevelopment
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_ConstructionInProgressGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
Name: | us-gaap_ValuationAllowancesAndReservesBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant