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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Allowances [Line Items]
Promotional Allowances		$ 0		$ 0
Food and Beverage
Allowances [Line Items]
Promotional Allowances	$ 43,599	43,351	$ 129,522	129,826
Rooms
Allowances [Line Items]
Promotional Allowances	19,437	19,554	58,298	57,197
Other Products and Services
Allowances [Line Items]
Promotional Allowances	$ 3,061	$ 2,653	$ 8,389	$ 7,848

X

- Definition

Allowances [Line Items]

+ References

No definition available.

+ Details

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

X

- Definition

This element represents the estimated retail value of accommodations, food and beverage, and other services furnished to guests without charge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 605
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=68080496&loc=d3e51325-107943

+ Details

Name:	us-gaap_PromotionalAllowances
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_ProductOrServiceAxis=byd_FoodAndBeverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=byd_RoomsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=byd_OtherProductsAndServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: