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Summary of Significant Accounting Policies Equity Method Investments (Details)	Dec. 31, 2018
Borgata
Schedule of Equity Method Investments [Line Items]
Ownership percentage by noncontrolling owners	50.00%

X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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

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

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

X

- Details

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