XML 140 R120.htm IDEA: XBRL DOCUMENT v3.3.1.900

Related Party Transactions (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 a
Related Party Transaction [Line Items]
Ownership percentage			50.00%
William S. Boyd and His Immediate Family
Related Party Transaction [Line Items]
Ownership percentage			27.00%
Borgata [Member] | MGM
Related Party Transaction [Line Items]
Land subject to ground leases | a			8.4
Borgata [Member] | MGM | Selling, general and administrative
Related Party Transaction [Line Items]
Ground leases property taxes | $	$ 0.8	$ 3.2

X

- Definition

Property Tax, Incurred on Ground Leases

+ References

No definition available.

+ Details

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Namespace Prefix:	byd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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Period Type:	instant

X

- Definition

Area of land subject to a ground lease.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

Name:	dei_LegalEntityAxis=byd_BorgataMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=byd_MgmMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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