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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Food and Beverage
Allowances [Line Items]
Promotional Allowances (Deprecated 2018-01-31)	$ 53,918	$ 42,638
Rooms
Allowances [Line Items]
Promotional Allowances (Deprecated 2018-01-31)	23,274	19,000
Other Products and Services
Allowances [Line Items]
Promotional Allowances (Deprecated 2018-01-31)	$ 3,466	$ 2,580

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- Definition

Allowances [Line Items]

+ References

No definition available.

+ Details

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

X

- Definition

Promo Allowances

+ References

No definition available.

+ Details

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

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- Details

Name:	srt_ProductOrServiceAxis=us-gaap_FoodAndBeverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=byd_RoomsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=byd_OtherProductsAndServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: