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v3.19.1

Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Food and Beverage |  |
Allowances [Line Items] |  |
Promotional Allowances (Deprecated 2018-01-31) | $ 53,918 | $ 42,638
Rooms |  |
Allowances [Line Items] |  |
Promotional Allowances (Deprecated 2018-01-31) | 23,274 | 19,000
Other Products and Services |  |
Allowances [Line Items] |  |
Promotional Allowances (Deprecated 2018-01-31) | $ 3,466 | $ 2,580

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- Definition Allowances [Line Items] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Promo Allowances + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=byd_OtherProductsAndServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |