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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Allowances [Line Items] |  |  |  |
Promotional Allowances |  | $ 0 |  | $ 0
Food and Beverage |  |  |  |
Allowances [Line Items] |  |  |  |
Promotional Allowances | $ 43,285 | 43,662 | $ 85,923 | 86,475
Rooms |  |  |  |
Allowances [Line Items] |  |  |  |
Promotional Allowances | 19,861 | 19,053 | 38,861 | 37,642
Other Products and Services |  |  |  |
Allowances [Line Items] |  |  |  |
Promotional Allowances | $ 2,749 | $ 2,667 | $ 5,329 | $ 5,195

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- Definition Allowances [Line Items] + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:stringItemType
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- Definition This element represents the estimated retail value of accommodations, food and beverage, and other services furnished to guests without charge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 605 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68080496&loc=d3e51325-107943 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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