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Long-Term Debt (Boyd Senior and Senior Subordinated Notes Narrative) (Details)			12 Months Ended
	May 22, 2015 USD ($)	Jun. 08, 2012	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 06, 2016	Mar. 28, 2016 USD ($)	May 21, 2015 USD ($)	Nov. 10, 2010
For the year ending December 31,
Interest			$ 33,407,000	$ 35,337,000
Premium and Consent Fees Paid			15,750,000	24,246,000	$ 0
Payments of Debt Issuance Costs			42,220,000	14,004,000	83,000
Gain Loss on Early Retirements of Debt			(42,364,000)	(40,733,000)	(1,536,000)
Boyd
For the year ending December 31,
Outstanding principal			3,283,129,000	2,309,725,000
Premium and Consent Fees Paid			(15,750,000)	24,246,000
Payments of Debt Issuance Costs			42,220,000	(14,004,000)	(83,000)
Subsidiaries, Ownership Percentage									100.00%
Gain Loss on Early Retirements of Debt			$ (28,356,000)	(30,829,000)	$ 0
Boyd | Senior Notes | 9.125% Senior Notes Due 2018
For the year ending December 31,
Debt instrument, stated interest rate									9.125%
Boyd | Senior Notes | Senior Notes Due 2020 [Member]
For the year ending December 31,
Outstanding principal				$ 350,000,000
Debt instrument, stated interest rate		9.00%		9.00%		9.00%
Debt instrument, redemption price, percentage		104.50%
Boyd | Senior Notes | Senior Notes Due 2023 [Member]
For the year ending December 31,
Outstanding principal				$ 750,000,000
Face amount								$ 750,000,000
Debt instrument, stated interest rate			6.875%	6.88%				6.875%	6.875%
Payments of Debt Issuance Costs	$ 14,000,000
Subsidiaries, Ownership Percentage								100.00%
Conditional repurchase price, % of principal								101.00%
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 Notes | Senior Notes Due 2026 [Member]
For the year ending December 31,
Face amount							$ 750,000,000
Debt instrument, stated interest rate			6.375%				6.375%	6.375%
Deferred finance costs							$ 13,000,000.0
Subsidiaries, Ownership Percentage								100.00%
Conditional repurchase price, % of principal							101.00%
Boyd | Senior Notes | Senior Notes Due 2026 [Member] | Prior to April 1, 2021 [Member]
For the year ending December 31,
Debt instrument, redemption price, percentage	100.00%
Boyd | Senior Notes | Senior Notes Due 2026 [Member] | After April 15, 2021 and Prior to 2024 [Member]
For the year ending December 31,
Conditional repurchase price, % of principal							103.188%
Boyd | Senior Notes | Senior Notes Due 2026 [Member] | Prior to April 15, 2024 [Member]
For the year ending December 31,
Conditional repurchase price, % of principal							100.00%
Boyd | Senior Secured Notes
For the year ending December 31,
Minimum required coverage ratio			2.0

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