v2.4.0.6

Asset Acquisitions (Consideration Transferred) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended		12 Months Ended
	Nov. 20, 2012 Peninsula Gaming	Oct. 04, 2011 IP Casino Resort Spa	Dec. 31, 2011 IP Casino Resort Spa
Business Acquisition [Line Items]
Purchase price	$ 1,353,737	$ 287,000
HoldCo Note	113,600
Contingent consideration - Kansas Star earn out	9,800
Liabilities assumed on behalf of the seller		1,881
Working capital adjustments		(8,252)
Total consideration	$ 1,477,137	$ 280,629	$ 280,629

X

- Definition

Business Combination Consideration Transferred1

+ References

No definition available.

+ Details

Name:	byd_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	byd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Business Combination, Consideration Transferred, Liabilities Incurred

+ References

No definition available.

+ Details

Name:	byd_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
Namespace Prefix:	byd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Business Combination, Consideration Transferred, Liabilities Incurred, Note to Seller

+ References

No definition available.

+ Details

Name:	byd_BusinessCombinationConsiderationTransferredLiabilitiesIncurredNoteToSeller
Namespace Prefix:	byd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Business Combination, Consideration Transferred, Working Capital and Other Adjustments

+ References

No definition available.

+ Details

Name:	byd_BusinessCombinationConsiderationTransferredWorkingCapitalAndOtherAdjustments
Namespace Prefix:	byd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Business Combination, Contingent Consideration, Liability for Merger Earnout

+ References

No definition available.

+ Details

Name:	byd_BusinessCombinationContingentConsiderationLiabilityForMergerEarnout
Namespace Prefix:	byd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15, 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration