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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 | $ 240,537 | $ 243,657
Cost of promotional allowances | 181,612 | 186,284 | 191,130
Rooms |  |  |
Allowances [Line Items] |  |  |
Promotional allowances | 77,177 | 77,751 | 75,673
Cost of promotional allowances | 35,605 | 36,837 | 37,520
Food and Beverage |  |  |
Allowances [Line Items] |  |  |
Promotional allowances | 150,598 | 151,677 | 155,530
Cost of promotional allowances | 133,717 | 138,040 | 141,915
Other Products and Services |  |  |
Allowances [Line Items] |  |  |
Promotional allowances | 14,870 | 11,109 | 12,454
Cost of promotional allowances | $ 12,290 | $ 11,407 | $ 11,695

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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
Name: | byd_CostOfPromotionalAllowances
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
Name: | us-gaap_PromotionalAllowances
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: |
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: |