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Noncontrolling Interest (Changes in Noncontrolling Interest) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance, January 1, 2015	$ 50us-gaap_MinorityInterest	$ 180,450us-gaap_MinorityInterest
Attributable net income	0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	5,043us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Capital Investment Attributable to Noncontrolling Interest		(30)us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation
Balance, March 31, 2015	50us-gaap_MinorityInterest	175,437us-gaap_MinorityInterest
Capital Investment Attributable to Noncontrolling Interest		30byd_CapitalInvestmentAttributableToNoncontrollingInterest
Subsidiary, Borgata
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance, January 1, 2015		180,430us-gaap_MinorityInterest / dei_LegalEntityAxis = byd_SubsidiaryBorgataMember
Attributable net income		5,043us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = byd_SubsidiaryBorgataMember
Capital Investment Attributable to Noncontrolling Interest		0us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation / dei_LegalEntityAxis = byd_SubsidiaryBorgataMember
Balance, March 31, 2015		175,387us-gaap_MinorityInterest / dei_LegalEntityAxis = byd_SubsidiaryBorgataMember
Other
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance, January 1, 2015		20us-gaap_MinorityInterest / dei_LegalEntityAxis = byd_OtherMemberMember
Attributable net income		0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = byd_OtherMemberMember
Capital Investment Attributable to Noncontrolling Interest		30us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation / dei_LegalEntityAxis = byd_OtherMemberMember
Balance, March 31, 2015		$ 50us-gaap_MinorityInterest / dei_LegalEntityAxis = byd_OtherMemberMember

X

- Definition

Capital investment attributable to noncontrolling interest

+ References

No definition available.

+ Details

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X

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

+ 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 210.5-02.31)

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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 27

-Article 5



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 20

-Article 7

+ Details

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- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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X

- Definition

The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest.

+ References

No definition available.

+ Details

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