XML 62 R52.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Summary of Significant Accounting Policies Equity Method Investments (Details) | Dec. 31, 2017
--- | ---
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
Name: | us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
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: |