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Long-Term Debt (Boyd Senior and Senior Subordinated Notes Narrative) (Details) $ in Thousands			9 Months Ended	12 Months Ended
	May. 22, 2015 USD ($)	Jun. 08, 2012 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Nov. 06, 2015 USD ($)	May. 21, 2015	Nov. 10, 2010
For the year ending December 31,
Outstanding principal				$ 3,322,475
Interest				35,337	$ 33,985
Premium and Consent Fees Paid				(24,246)	0	$ 0
Payments of Debt Issuance Costs				14,004	288	44,752
Gain Loss on Early Retirements of Debt				(40,733)	(1,536)	(54,202)
Boyd
For the year ending December 31,
Outstanding principal				2,309,725	2,389,165
Premium and Consent Fees Paid				(24,246)	0	0
Payments of Debt Issuance Costs				14,004	83	$ 24,349
Subsidiaries, Ownership Percentage						100.00%			100.00%
Gain Loss on Early Retirements of Debt				$ (30,829)	0	$ (25,001)
Boyd | Senior Notes | 9.125% Senior Notes Due 2018
For the year ending December 31,
Outstanding principal					$ 500,000
Debt instrument, stated interest rate					9.13%				9.125%
Premium and Consent Fees Paid			$ 24,000
Write off of Deferred Debt Issuance Cost			$ 4,900
Debt instrument, redemption price, percentage			104.563%
Boyd | Senior Notes | 9.00% senior notes due 2020
For the year ending December 31,
Outstanding principal					$ 350,000
Face amount		$ 350,000
Debt instrument, stated interest rate		9.00%		9.00%	9.00%
Conditional repurchase price, % of principal				101.00%
Boyd | Senior Notes | 9.00% senior notes due 2020 | Prior to July 1, 2016
For the year ending December 31,
Debt instrument, redemption price, percentage		100.00%
Boyd | Senior Notes | 9.00% senior notes due 2020 | After July 1, 2016 and Prior to 2018
For the year ending December 31,
Debt instrument, redemption price, percentage		104.50%
Boyd | Senior Notes | 9.00% senior notes due 2020 | During 2018 and Thereafter
For the year ending December 31,
Debt instrument, redemption price, percentage		100.00%
Boyd | Senior Notes | Senior Notes Due 2023 [Member]
For the year ending December 31,
Debt instrument, stated interest rate				6.875%				6.875%
Payments of Debt Issuance Costs	$ 14,000
Boyd | Senior Notes | Senior Notes Due 2023 [Member] | Prior to May 15, 2018 [Member]
For the year ending December 31,
Debt instrument, redemption price, percentage	100.00%
Boyd | Senior Notes | Senior Notes Due 2023 [Member] | After May 15, 2018 and Prior to 2021 [Member]
For the year ending December 31,
Debt instrument, redemption price, percentage	105.156%
Boyd | Senior Subordinated Notes | 6.75% Senior Subordinated Notes Due 2014
For the year ending December 31,
Outstanding principal							$ 157,800
Interest							$ 5,800
Gain Loss on Early Retirements of Debt				$ 7,900
Boyd | Senior Secured Notes
For the year ending December 31,
Minimum required coverage ratio				2.0

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