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Deconsolidation of Borgata (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Jan. 31, 2010
Consolidated Entities [Line Items]
Assets, Current	$ 232,034us-gaap_AssetsCurrent		$ 241,950us-gaap_AssetsCurrent
Impairments of assets	1,065us-gaap_AssetImpairmentCharges	1,633us-gaap_AssetImpairmentCharges
Investment in unconsolidated subsidiary	226,732byd_InvestmentsInSubsidiaries		222,717byd_InvestmentsInSubsidiaries
Assets	(4,426,784)us-gaap_Assets		(4,478,924)us-gaap_Assets
Liabilities, Current	$ 334,065us-gaap_LiabilitiesCurrent		$ 357,195us-gaap_LiabilitiesCurrent
Subsidiary, Borgata
Consolidated Entities [Line Items]
Equity Method Investment, Ownership Percentage				50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = byd_SubsidiaryBorgataMember

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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