Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Unamortized discount	$ (2,288)	$ (2,702)
Unamortized origination fees	(58,613)	(50,224)
Current maturities of long-term debt	27,688	29,750
Long-term debt, gross, excluding current maturities	3,718,812	3,292,725
Long-term debt, net of current maturities and debt issuance costs	$ 3,657,911	3,239,799
Senior Notes \| 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.00%
Parent
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 2,753,275	2,309,725
Unamortized discount	(2,288)	(2,702)
Unamortized origination fees	(41,001)	(29,724)
Long-term debt, net	2,709,986	2,277,299
Current maturities of long-term debt	21,500	21,500
Long-term debt, net of current maturities and debt issuance costs	2,688,486	2,255,800
Parent \| Bank Credit Facility
Debt Instrument [Line Items]
Amount outstanding	903,275	$ 1,209,725
Remaining borrowing capacity	$ 592,900
Parent \| Bank Credit Facility \| Bank Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate at period end	3.881%	3.75%
Unamortized discount	$ (2,288)	$ (2,702)
Unamortized origination fees	(8,894)	(9,746)
Parent \| Senior Notes \| 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Unamortized discount	0	0
Unamortized origination fees	$ 6,647	$ (7,044)
Debt Instrument, Interest Rate, Stated Percentage	9.00%	9.00%
Parent \| Senior Notes \| 6.875 % Senior Notes Due 2023
Debt Instrument [Line Items]
Unamortized discount	$ 0	$ 0
Unamortized origination fees	$ (12,525)	$ (12,934)
Debt Instrument, Interest Rate, Stated Percentage	6.875%	6.875%
Parent \| Senior Notes \| 6.375% Senior Notes Due 2026
Debt Instrument [Line Items]
Unamortized discount	$ 0
Unamortized origination fees	$ (12,935)
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Subsidiary, Peninsula Gaming [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 993,225	$ 1,012,750
Unamortized discount	0	0
Unamortized origination fees	(17,612)	(20,500)
Long-term debt, net	975,613	992,250
Subsidiary, Peninsula Gaming [Member] \| Bank Credit Facility
Debt Instrument [Line Items]
Amount outstanding	643,225	$ 662,750
Remaining borrowing capacity	$ 23,400
Subsidiary, Peninsula Gaming [Member] \| Bank Credit Facility \| Bank Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate at period end	4.25%	4.25%
Unamortized discount	$ 0	$ 0
Unamortized origination fees	11,939	(14,143)
Subsidiary, Peninsula Gaming [Member] \| Senior Notes \| Peninsula Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Unamortized discount	0	0
Unamortized origination fees	$ 5,673	$ (6,357)
Debt Instrument, Interest Rate, Stated Percentage	8.38%	8.38%
Consolidated, Excluding Borgata [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 3,746,500	$ 3,322,475
Unamortized discount	(2,288)	(2,702)
Unamortized origination fees	(58,613)	(50,224)
Long-term debt, net	3,685,599	3,269,549
Subsidiary, Borgata
Debt Instrument [Line Items]
Long-term Debt, Gross	651,450	697,550
Subsidiary, Borgata \| Bank Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	11,600	37,700
Fair Value, Measurements, Nonrecurring [Member] \| Level 2 \| Parent \| Bank Credit Facility \| Bank Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	903,275	1,209,725
Fair Value, Measurements, Nonrecurring [Member] \| Level 2 \| Subsidiary, Peninsula Gaming [Member] \| Bank Credit Facility \| Bank Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		662,750
Long-term debt, net	643,225	662,750
Fair Value, Measurements, Nonrecurring [Member] \| Level 2 \| Subsidiary, Peninsula Gaming [Member] \| Senior Notes \| Peninsula Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		350,000
Long-term debt, net	350,000	350,000
Fair Value, Measurements, Nonrecurring [Member] \| Level 1 \| Parent \| Senior Notes \| 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Long-term Debt, Gross	350,000	350,000
Fair Value, Measurements, Nonrecurring [Member] \| Level 1 \| Parent \| Senior Notes \| 6.875 % Senior Notes Due 2023
Debt Instrument [Line Items]
Long-term Debt, Gross	750,000	750,000
Fair Value, Measurements, Nonrecurring [Member] \| Level 1 \| Parent \| Senior Notes \| 6.375% Senior Notes Due 2026
Debt Instrument [Line Items]
Long-term Debt, Gross	750,000
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Parent
Debt Instrument [Line Items]
Commitments, Fair Value Disclosure	34,655	35,126
Estimate of Fair Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Parent
Debt Instrument [Line Items]
Commitments, Fair Value Disclosure	28,282	28,381
Carrying Value \| Parent
Debt Instrument [Line Items]
Long-term debt, net	2,709,986	2,277,299
Carrying Value \| Subsidiary, Peninsula Gaming [Member]
Debt Instrument [Line Items]
Long-term debt, net	975,613	992,250
Carrying Value \| Consolidated, Excluding Borgata [Member]
Debt Instrument [Line Items]
Long-term debt, net	3,685,599	3,269,549
Carrying Value \| Fair Value, Measurements, Nonrecurring [Member] \| Level 2 \| Parent \| Bank Credit Facility \| Bank Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, net	892,093	1,197,277
Carrying Value \| Fair Value, Measurements, Nonrecurring [Member] \| Level 2 \| Subsidiary, Peninsula Gaming [Member] \| Bank Credit Facility \| Bank Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, net	631,286	648,607
Carrying Value \| Fair Value, Measurements, Nonrecurring [Member] \| Level 2 \| Subsidiary, Peninsula Gaming [Member] \| Senior Notes \| Peninsula Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt, net	344,327	343,643
Carrying Value \| Fair Value, Measurements, Nonrecurring [Member] \| Level 1 \| Parent \| Senior Notes \| 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Long-term debt, net	343,353	342,956
Carrying Value \| Fair Value, Measurements, Nonrecurring [Member] \| Level 1 \| Parent \| Senior Notes \| 6.875 % Senior Notes Due 2023
Debt Instrument [Line Items]
Long-term debt, net	737,475	737,066
Carrying Value \| Fair Value, Measurements, Nonrecurring [Member] \| Level 1 \| Parent \| Senior Notes \| 6.375% Senior Notes Due 2026
Debt Instrument [Line Items]
Long-term debt, net	737,065
Carrying Value \| Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Parent
Debt Instrument [Line Items]
Commitments, Fair Value Disclosure	$ 27,357	$ 27,660

Debt Instrument, Unamortized Origination Fees

No definition available.

Name:	byd_DebtInstrumentUnamortizedOriginationFees
Namespace Prefix:	byd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Long-term Debt, Gross, Excluding Current Maturities

+ References

No definition available.

+ Details

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

- Definition

Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.

+ 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 210.5-02.25)
-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 03
-Paragraph 19
-Article 7

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 17
-Article 9

+ Details

Name:	us-gaap_CommitmentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ 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 210.5-02.22)
-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 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

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

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

Name:	us-gaap_LongTermDebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=byd_SeniorNotesDue2020Member
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_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=byd_BankCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=byd_SeniorNotesDue2023MemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=byd_A6.375SeniorNotesDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=byd_PeninsulaSeniorNotesDue2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: