XML 53 R43.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Summary of Significant Accounting Policies (Property, Plant and Equipment Useful Lives) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |
Interest Costs Capitalized |  | $ 0.5 | $ 0.1
Interest Cost Capitalized | no |  |
Building and Improvements | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful lives | 3 years |  |
Building and Improvements | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful lives | 40 years |  |
Riverboats and Barges | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful lives | 5 years |  |
Riverboats and Barges | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful lives | 40 years |  |
Furniture and Equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful lives | 1 year |  |
Furniture and Equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful lives | 10 years |  |

X
- Definition Interest Cost Capitalized + References No definition available. + Details
Name: | byd_InterestCostCapitalized
Namespace Prefix: | byd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
Name: | us-gaap_InterestCostsCapitalized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=byd_RiverboatsAndBargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=byd_FurnitureAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |