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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowances [Line Items] |  |  |
Promotional allowances | $ 259,370 | $ 235,577 | $ 242,645
Cost of promotional allowances | 197,330 | 176,872 | 181,612
Rooms |  |  |
Allowances [Line Items] |  |  |
Promotional allowances | 76,029 | 74,937 | 77,177
Cost of promotional allowances | 33,584 | 33,514 | 35,605
Food and Beverage |  |  |
Allowances [Line Items] |  |  |
Promotional allowances | 168,886 | 146,946 | 150,598
Cost of promotional allowances | 150,431 | 130,941 | 133,717
Other Products and Services |  |  |
Allowances [Line Items] |  |  |
Promotional allowances | 14,455 | 13,694 | 14,870
Cost of promotional allowances | $ 13,315 | $ 12,417 | $ 12,290

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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 Cost of Promotional 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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- 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: |
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Balance Type: |
Period Type: |

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