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Note 14 - Segment Information - Reconciliation of Capital Expenditures (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Capital expenditures | $ 204,604 | $ 165,911 | $ 190,417
Change in Accrued Property Additions | 3,033 | (4,367) | 47
Cash-Based Capital Expenditures | 207,637 | 161,544 | 190,464
Las Vegas Locals [Member] |  |  |
Capital expenditures | 26,207 | 33,503 | 59,382
Downtown Las Vegas [Member] |  |  |
Capital expenditures | 8,881 | 12,885 | 21,705
Midwest and South [Member] |  |  |
Capital expenditures | 80,883 | 69,285 | 37,657
Total Reportable Segment [Member] |  |  |
Capital expenditures | 115,971 | 115,673 | 118,744
Corporate Segment [Member] |  |  |
Capital expenditures | $ 88,633 | $ 50,238 | $ 71,673

X
- Definition The amount of capital expenditures. + References No definition available. + Details
Name: | byd_CapitalExpenditures
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of cash based capital expenditures. + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of increase (decrease) in accrued property additions. + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

X
- Details
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Namespace Prefix: |
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Period Type: |

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