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Summary of Significant Accounting Policies (Promotional Allowances) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Allowances [Line Items]
Promotional allowances	$ 59,513us-gaap_PromotionalAllowances	$ 110,391us-gaap_PromotionalAllowances
Cost of promotional allowances	45,121byd_CostOfPromotionalAllowances	62,709byd_CostOfPromotionalAllowances
Rooms
Allowances [Line Items]
Promotional allowances	18,744us-gaap_PromotionalAllowances / us-gaap_ProductOrServiceAxis = byd_RoomsMember	35,424us-gaap_PromotionalAllowances / us-gaap_ProductOrServiceAxis = byd_RoomsMember
Cost of promotional allowances	8,782byd_CostOfPromotionalAllowances / us-gaap_ProductOrServiceAxis = byd_RoomsMember	14,134byd_CostOfPromotionalAllowances / us-gaap_ProductOrServiceAxis = byd_RoomsMember
Food and Beverage
Allowances [Line Items]
Promotional allowances	37,714us-gaap_PromotionalAllowances / us-gaap_ProductOrServiceAxis = byd_FoodAndBeverageMember	49,872us-gaap_PromotionalAllowances / us-gaap_ProductOrServiceAxis = byd_FoodAndBeverageMember
Cost of promotional allowances	33,552byd_CostOfPromotionalAllowances / us-gaap_ProductOrServiceAxis = byd_FoodAndBeverageMember	43,561byd_CostOfPromotionalAllowances / us-gaap_ProductOrServiceAxis = byd_FoodAndBeverageMember
Other Products and Services
Allowances [Line Items]
Promotional allowances	3,055us-gaap_PromotionalAllowances / us-gaap_ProductOrServiceAxis = byd_OtherProductsAndServicesMember	25,095us-gaap_PromotionalAllowances / us-gaap_ProductOrServiceAxis = byd_OtherProductsAndServicesMember
Cost of promotional allowances	$ 2,787byd_CostOfPromotionalAllowances / us-gaap_ProductOrServiceAxis = byd_OtherProductsAndServicesMember	$ 5,014byd_CostOfPromotionalAllowances / us-gaap_ProductOrServiceAxis = byd_OtherProductsAndServicesMember

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- Definition

Cost of Promotional Allowances

+ References

No definition available.

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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=6472957&loc=d3e51325-107943

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