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Summary of Significant Accounting Policies (Preopening Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Preopening Expenses [Line Items]
Project development, preopening and writedowns	$ 6,907	$ 13,747

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- Definition

[Line Items] for Preopening Expenses [Table]

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No definition available.

+ Details

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Namespace Prefix:	byd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Project development, preopening and writedowns

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No definition available.

+ Details

Name:	byd_Projectdevelopmentpreopeningandwritedowns
Namespace Prefix:	byd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration