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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Allowances [Line Items] |  |  |
Promotional allowances | $ 242,645 | $ 416,874 | $ 461,473
Cost of promotional allowances | 181,612 | 242,031 | 263,316
Rooms |  |  |
Allowances [Line Items] |  |  |
Promotional allowances | 77,177 | 132,231 | 147,305
Cost of promotional allowances | 35,605 | 53,167 | 58,960
Food and Beverage |  |  |
Allowances [Line Items] |  |  |
Promotional allowances | 150,598 | 190,632 | 207,072
Cost of promotional allowances | 133,717 | 168,626 | 181,689
Other Products and Services |  |  |
Allowances [Line Items] |  |  |
Promotional allowances | 14,870 | 94,011 | 107,096
Cost of promotional allowances | $ 12,290 | $ 20,238 | $ 22,667

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- Definition Allowances [Line Items] + References No definition available. + Details
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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=51665414&loc=d3e51325-107943 + Details
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Namespace Prefix: | us-gaap_
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: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |