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Segment Information (Reconciliation of Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 4,426,784us-gaap_Assets	$ 4,478,924us-gaap_Assets
Las Vegas Locals
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,153,323us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = byd_ReportableSegmentLasVegasLocalsMember	1,164,115us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = byd_ReportableSegmentLasVegasLocalsMember
Downtown Las Vegas
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	129,986us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = byd_ReportableSegmentDowntownLasVegasMember	128,682us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = byd_ReportableSegmentDowntownLasVegasMember
Midwest and South
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,279,751us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = byd_ReportableSegmentMidwestAndSouthMember	1,302,002us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = byd_ReportableSegmentMidwestAndSouthMember
Peninsula
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,446,827us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = byd_ReportableSegmentPeninsulaMember	1,459,529us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = byd_ReportableSegmentPeninsulaMember
Reportable Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,009,887us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = byd_ReportableSegmentMember	4,054,328us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = byd_ReportableSegmentMember
Corporate Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 416,897us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ 424,596us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

+ Details

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- Details

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- Details

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