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Summary of Significant Accounting Policies (Preopening Expenses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Preopening Expenses [Line Items] |  |  |
Project development, preopening and writedowns | $ 45,698 | $ 14,454 | $ 22,107

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- Definition [Line Items] for Preopening Expenses [Table] + References No definition available. + Details
Name: | byd_PreopeningExpensesLineItems
Namespace Prefix: | byd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Project development, preopening and writedowns + References No definition available. + Details
Name: | byd_Projectdevelopmentpreopeningandwritedowns
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration