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Commitments and Contingencies Contingent Payments (Details) | 12 Months Ended
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Dec. 31, 2017
Other Commitments [Line Items] |
Payment to option holder, percentage of EBITDA | 1.00%

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- Definition Business Combination, Contingent Consideration Arrangements, Payment to Option Holder, Percentage of EBITDA + References No definition available. + Details
Name: | byd_BusinessCombinationContingentConsiderationArrangementsPaymentToOptionHolderPercentageOfEbitda
Namespace Prefix: | byd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration