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Intangible Assets (Summary of Amortizing and Indefinite-Lived Intangibles) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2013	Dec. 31, 2014
Intangible Assets [Line Items]
Intangible assets, gross	$ 1,209,179us-gaap_IntangibleAssetsGrossExcludingGoodwill		$ 1,209,179us-gaap_IntangibleAssetsGrossExcludingGoodwill
Intangible assets, cumulative amortization	(139,231)byd_IntangibleAssetsAccumulatedAmortization		(132,558)byd_IntangibleAssetsAccumulatedAmortization
Intangible assets, cumulative impairment	(142,372)byd_CumulativeImpairmentOfIntangibleAssetsExcludingGoodwill		(142,372)byd_CumulativeImpairmentOfIntangibleAssetsExcludingGoodwill
Intangible assets, net	927,576us-gaap_IntangibleAssetsNetExcludingGoodwill		934,249us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortizing intangibles:
Gross carrying value	206,343us-gaap_FiniteLivedIntangibleAssetsGross		206,343us-gaap_FiniteLivedIntangibleAssetsGross
Cumulative amortization	(105,271)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization		(98,598)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Cumulative impairment losses	0byd_FiniteLivedIntangibleAssetsCumulativeImpairmentLosses		0byd_FiniteLivedIntangibleAssetsCumulativeImpairmentLosses
Intangible assets, net	101,072us-gaap_FiniteLivedIntangibleAssetsNet		107,745us-gaap_FiniteLivedIntangibleAssetsNet
Indefinite lived intangible assets:
Gross carrying value	1,002,836byd_IndefiniteLivedIntangibleAssetsGross		1,002,836byd_IndefiniteLivedIntangibleAssetsGross
Cumulative amortization	(33,960)byd_IndefiniteLivedIntangibleAssetsCumulativePreviouslyRecognizedAmortization		(33,960)byd_IndefiniteLivedIntangibleAssetsCumulativePreviouslyRecognizedAmortization
Cumulative impairment losses	(142,372)byd_CumulativeImpairmentOfIntangibleAssetsIndefiniteLivedExcludingGoodwill		(142,372)byd_CumulativeImpairmentOfIntangibleAssetsIndefiniteLivedExcludingGoodwill
Intangible assets, net	826,504us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill		826,504us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Customer Relationships [Member]
Amortizing intangibles:
Weighted average life	2 years 8 months	2 years 11 months
Gross carrying value	139,600us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember		139,600us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Cumulative amortization	(94,056)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember		(87,642)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Cumulative impairment losses	0byd_FiniteLivedIntangibleAssetsCumulativeImpairmentLosses / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember		0byd_FiniteLivedIntangibleAssetsCumulativeImpairmentLosses / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Intangible assets, net	45,544us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember		51,958us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Off-Market Favorable Lease [Member]
Amortizing intangibles:
Weighted average life	33 years 2 months	33 years 4 months 24 days
Gross carrying value	45,370us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OffMarketFavorableLeaseMember		45,370us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OffMarketFavorableLeaseMember
Cumulative amortization	(11,215)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OffMarketFavorableLeaseMember		(10,956)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OffMarketFavorableLeaseMember
Cumulative impairment losses	0byd_FiniteLivedIntangibleAssetsCumulativeImpairmentLosses / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OffMarketFavorableLeaseMember		0byd_FiniteLivedIntangibleAssetsCumulativeImpairmentLosses / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OffMarketFavorableLeaseMember
Intangible assets, net	34,155us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OffMarketFavorableLeaseMember		34,414us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OffMarketFavorableLeaseMember
Non-Competition Agreement
Amortizing intangibles:
Weighted average life		0 years
Development Agreement
Amortizing intangibles:
Weighted average life	0 years	0 years
Gross carrying value	21,373us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = byd_DevelopmentAgreementMember		21,373us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = byd_DevelopmentAgreementMember
Cumulative amortization	0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = byd_DevelopmentAgreementMember		0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = byd_DevelopmentAgreementMember
Cumulative impairment losses	0byd_FiniteLivedIntangibleAssetsCumulativeImpairmentLosses / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = byd_DevelopmentAgreementMember		0byd_FiniteLivedIntangibleAssetsCumulativeImpairmentLosses / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = byd_DevelopmentAgreementMember
Intangible assets, net	21,373us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = byd_DevelopmentAgreementMember		21,373us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = byd_DevelopmentAgreementMember
Trademarks
Indefinite lived intangible assets:
Gross carrying value	129,501byd_IndefiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember		129,501byd_IndefiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Cumulative amortization	0byd_IndefiniteLivedIntangibleAssetsCumulativePreviouslyRecognizedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember		0byd_IndefiniteLivedIntangibleAssetsCumulativePreviouslyRecognizedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Cumulative impairment losses	(3,500)byd_CumulativeImpairmentOfIntangibleAssetsIndefiniteLivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember		(3,500)byd_CumulativeImpairmentOfIntangibleAssetsIndefiniteLivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Intangible assets, net	126,001us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember		126,001us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Gaming License Rights
Indefinite lived intangible assets:
Gross carrying value	873,335byd_IndefiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember		873,335byd_IndefiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Cumulative amortization	(33,960)byd_IndefiniteLivedIntangibleAssetsCumulativePreviouslyRecognizedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember		(33,960)byd_IndefiniteLivedIntangibleAssetsCumulativePreviouslyRecognizedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Cumulative impairment losses	(138,872)byd_CumulativeImpairmentOfIntangibleAssetsIndefiniteLivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember		(138,872)byd_CumulativeImpairmentOfIntangibleAssetsIndefiniteLivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Intangible assets, net	$ 700,503us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember		$ 700,503us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember

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