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Property and Equipment, Net (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 4,138,953,000us-gaap_PropertyPlantAndEquipmentGross   $ 4,131,026,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation 1,888,157,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   1,844,918,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 2,250,796,000us-gaap_PropertyPlantAndEquipmentNet   2,286,108,000us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense 45,100,000us-gaap_Depreciation 57,700,000us-gaap_Depreciation  
Land      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 229,684,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
  229,684,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings and Improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 2,528,526,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
  2,534,618,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 1,109,614,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
  1,079,878,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Riverboats and Barges      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 238,723,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= byd_RiverboatsAndBargesMember
  239,669,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= byd_RiverboatsAndBargesMember
Construction in Progress      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 24,034,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
  35,675,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
Other      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 8,372,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember
  $ 11,502,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember