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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowances [Line Items] |  |  |
Promotional allowances |  | $ 0 | $ 0
Food and Beverage |  |  |
Allowances [Line Items] |  |  |
Promotional allowances | $ 182,960 | 171,904 | 147,494
Rooms [Member] |  |  |
Allowances [Line Items] |  |  |
Promotional allowances | 81,671 | 76,565 | 75,647
Other Products and Services |  |  |
Allowances [Line Items] |  |  |
Promotional allowances | $ 11,939 | $ 10,900 | $ 11,076

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

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- Definition Promo Allowances + References No definition available. + Details
Name: | byd_PromoAllowances
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | srt_ProductOrServiceAxis=byd_RoomsMember
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: |