Condensed Consolidating Financial Information (Income Statements) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net revenues	$ 550,578us-gaap_SalesRevenueNet	$ 708,349us-gaap_SalesRevenueNet
Costs and Expenses
Operating	297,957	383,405
Selling, general and administrative	81,689	124,679
Maintenance and utilities	25,319byd_PropertyMaintenanceAndUtilityCosts	43,264byd_PropertyMaintenanceAndUtilityCosts
Depreciation and amortization	51,942us-gaap_DepreciationAndAmortization	66,179us-gaap_DepreciationAndAmortization
Corporate expense	19,652byd_CorporateExpense	19,920byd_CorporateExpense
Preopening expenses	505us-gaap_PreOpeningCosts	784us-gaap_PreOpeningCosts
Impairments of assets	1,065us-gaap_AssetImpairmentCharges	1,633us-gaap_AssetImpairmentCharges
Asset transactions costs	450byd_Assettransactionscosts	155byd_Assettransactionscosts
Other operating charges and credits, net	116us-gaap_OtherCostAndExpenseOperating	(186)us-gaap_OtherCostAndExpenseOperating
Intercompany expenses	0byd_IntercompanyExpense	0byd_IntercompanyExpense
Total operating costs and expenses	478,695us-gaap_CostsAndExpenses	639,833us-gaap_CostsAndExpenses
Equity in earnings of subsidiaries	11,675byd_EquityInEarningsOfSubsidiaries	0byd_EquityInEarningsOfSubsidiaries
Operating income	83,558us-gaap_OperatingIncomeLoss	68,516us-gaap_OperatingIncomeLoss
Other expense (income)
Interest expense, net	56,464	75,027
Loss on early extinguishments of debt	508	154
Other, net	618us-gaap_OtherIncome	(288)us-gaap_OtherIncome
Boyd's share of Borgata's non-operating items, net	7,661	0
Total other expense, net	65,251us-gaap_NonoperatingIncomeExpense	74,893us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes	18,307	(6,377)
Income taxes benefit (provision)	(16,796)us-gaap_IncomeTaxExpenseBenefit	4,848us-gaap_IncomeTaxExpenseBenefit
Attributable net income	0	5,043
Net income (loss)	(35,103)us-gaap_NetIncomeLoss	6,182us-gaap_NetIncomeLoss
Comprehensive income (loss)	35,374	(10,686)
Parent
Condensed Financial Statements, Captions [Line Items]
Net revenues	30,796	29,602
Costs and Expenses
Operating	450	450
Selling, general and administrative	12,403	11,652
Maintenance and utilities	0	0
Depreciation and amortization	1,287	1,627
Corporate expense	18,467	19,030
Preopening expenses	0	36
Impairments of assets	0	320
Asset transactions costs	(52)	0
Other operating charges and credits, net	0	150
Intercompany expenses	301	301
Total operating costs and expenses	32,856	33,566
Equity in earnings of subsidiaries	47,768	31,935
Operating income	45,708	27,971
Other expense (income)
Interest expense, net	33,396	32,920
Loss on early extinguishments of debt	0	0
Other, net	416	0
Boyd's share of Borgata's non-operating items, net	0
Total other expense, net	33,812	32,920
Income (loss) before income taxes	11,896	(4,949)
Income taxes benefit (provision)	(23,207)	1,233
Attributable net income		0
Net income (loss)	(35,103)	6,182
Comprehensive income (loss)	35,374	(5,643)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net revenues	418,592	411,801
Costs and Expenses
Operating	223,587	220,425
Selling, general and administrative	54,342	57,315
Maintenance and utilities	21,711	22,750
Depreciation and amortization	32,687	31,624
Corporate expense	54	23
Preopening expenses	0	6
Impairments of assets	0	1,013
Asset transactions costs	(17)	(20)
Other operating charges and credits, net	70	0
Intercompany expenses	30,841	29,407
Total operating costs and expenses	363,275	362,543
Equity in earnings of subsidiaries	7,652	(10,855)
Operating income	62,969	38,403
Other expense (income)
Interest expense, net	702	1,770
Loss on early extinguishments of debt	0	0
Other, net	0	0
Boyd's share of Borgata's non-operating items, net	7,661
Total other expense, net	8,363	1,770
Income (loss) before income taxes	54,606	36,633
Income taxes benefit (provision)	1,927	468
Attributable net income		0
Net income (loss)	(52,679)	(36,165)
Comprehensive income (loss)	52,950	36,704
Non-Guarantor Subsidiaries (100% Owned)
Condensed Financial Statements, Captions [Line Items]
Net revenues	137,525	134,441
Costs and Expenses
Operating	73,920	74,088
Selling, general and administrative	14,944	14,309
Maintenance and utilities	3,608	3,538
Depreciation and amortization	17,968	19,068
Corporate expense	1,131	867
Preopening expenses	464	628
Impairments of assets	1,065	300
Asset transactions costs	519	177
Other operating charges and credits, net	46	66
Intercompany expenses	5,193	5,051
Total operating costs and expenses	118,858	118,092
Equity in earnings of subsidiaries	(41)	(81)
Operating income	18,626	16,268
Other expense (income)
Interest expense, net	22,366	22,647
Loss on early extinguishments of debt	508	154
Other, net	202	(288)
Boyd's share of Borgata's non-operating items, net	0
Total other expense, net	23,076	22,513
Income (loss) before income taxes	(4,450)	(6,245)
Income taxes benefit (provision)	4,484	3,795
Attributable net income		0
Net income (loss)	8,934	10,040
Comprehensive income (loss)	(8,663)	(9,501)
Non-Guarantor Subsidiaries (Not 100% Owned)
Condensed Financial Statements, Captions [Line Items]
Net revenues	0	167,264
Costs and Expenses
Operating	0	88,442
Selling, general and administrative	0	41,403
Maintenance and utilities	0	16,976
Depreciation and amortization	0	13,860
Corporate expense	0	0
Preopening expenses	41	114
Impairments of assets	0	0
Asset transactions costs	0	(2)
Other operating charges and credits, net	0	(402)
Intercompany expenses	0	0
Total operating costs and expenses	41	160,391
Equity in earnings of subsidiaries	0	0
Operating income	(41)	6,873
Other expense (income)
Interest expense, net	0	17,690
Loss on early extinguishments of debt	0	0
Other, net	0	0
Boyd's share of Borgata's non-operating items, net	0
Total other expense, net	0	17,690
Income (loss) before income taxes	(41)	(10,817)
Income taxes benefit (provision)	0	(648)
Attributable net income		0
Net income (loss)	41	10,169
Comprehensive income (loss)	(41)	(10,169)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net revenues	(36,335)	(34,759)
Costs and Expenses
Operating	0	0
Selling, general and administrative	0	0
Maintenance and utilities	0	0
Depreciation and amortization	0	0
Corporate expense	0	0
Preopening expenses	0	0
Impairments of assets	0	0
Asset transactions costs	0	0
Other operating charges and credits, net	0	0
Intercompany expenses	(36,335)	(34,759)
Total operating costs and expenses	(36,335)	(34,759)
Equity in earnings of subsidiaries	(43,704)	(20,999)
Operating income	(43,704)	(20,999)
Other expense (income)
Interest expense, net	0	0
Loss on early extinguishments of debt	0	0
Other, net	0	0
Boyd's share of Borgata's non-operating items, net	0
Total other expense, net	0	0
Income (loss) before income taxes	(43,704)	(20,999)
Income taxes benefit (provision)	0	0
Attributable net income		5,043
Net income (loss)	43,704	15,956
Comprehensive income (loss)	(44,246)	(22,077)
Unallocated to Segment
Costs and Expenses
Corporate expense	16,642	14,171
Operating income		$ 68,516

Asset transactions costs

No definition available.

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

- Definition

Casino, Food and Beverage, Occupancy, Entertainment, Retail and Other Costs

+ References

No definition available.

+ Details

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

- Definition

Corporate expense

+ References

No definition available.

+ Details

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

- Definition

Equity in Earnings of Subsidiaries

+ References

No definition available.

+ Details

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

- Definition

Intercompany Expense

+ References

No definition available.

+ Details

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

- Definition

Non-operating expenses from equity investment

+ References

No definition available.

+ Details

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

- Definition

Property maintenance and utility costs

+ References

No definition available.

+ Details

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

- Definition

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.

+ References

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

+ Details

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

- Details

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

- Definition

Total costs of sales and operating expenses for the period.

+ References

+ Details

Name:	us-gaap_CostsAndExpenses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

Name:	us-gaap_DepreciationAndAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629

+ Details

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

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 5

+ Details

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

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6515339

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

+ Details

Name:	us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net amount of nonoperating interest income (expense).

+ References

No definition available.

+ Details

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

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.19)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.18)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.22)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 5

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 20

-Article 9

+ Details

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

- 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

+ Details

Name:	us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

+ References

+ Details

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

- Details

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

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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

- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ References

+ Details

Name:	us-gaap_OtherCostAndExpenseOperating
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.4)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 4

-Article 7

+ Details

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

- Definition

Expenditures associated with opening new locations which are noncapital in nature and expensed as incurred.

+ References

+ Details

Name:	us-gaap_PreOpeningCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

+ Details

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

- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 4

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311

+ Details

Name:	us-gaap_SellingGeneralAndAdministrativeExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Details

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

- Details

Name:	dei_LegalEntityAxis=us-gaap_ConsolidationEliminationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_GuarantorSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_MaterialReconcilingItemsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: