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Summary of Significant Accounting Policies (Gaming Investments) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
Regulatory Gaming Assets [Line Items] |
Interest Costs Capitalized | $ 0.5

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- Definition [Line Items] for Regulatory Gaming Assets [Table] + References No definition available. + Details
Name: | byd_RegulatoryGamingAssetsLineItems
Namespace Prefix: | byd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
Name: | us-gaap_InterestCostsCapitalized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration