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

X

- Definition

Business Combination, Contingent Consideration Arrangements, Payment to Option Holder, Percentage of EBITDA

+ References

No definition available.

+ Details

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Namespace Prefix:	byd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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