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Long-Term Debt (Boyd Senior and Senior Subordinated Notes Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Mar. 29, 2016	Jun. 08, 2012	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 06, 2016	Sep. 02, 2016	Mar. 28, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt financing costs, net					$ 40,718	$ 14,001
Loss on early extinguishments and modifications of debt			$ 41,518	$ 863	42,364	32,333
Premium and consent fees paid					(15,750)	(24,246)
Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Additional Interest Per Annum, Percent of Principal									0.25%
Debt Instrument, Maximum Additional Interest Per Annum, Percent of Principal									1.00%
Parent
Debt Instrument [Line Items]
Subsidiaries, Ownership Percentage									100.00%
Debt financing costs, net					40,718	14,001
Loss on early extinguishments and modifications of debt			28,356	444	28,356	30,452
Premium and consent fees paid					$ (15,750)	(24,246)
Parent | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage					101.00%
Loss on early extinguishments and modifications of debt			$ (4,497)	0	$ (4,497)	0
Parent | Senior Notes | 6.375% Senior Notes Due 2026
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.375%		6.375%
Debt Instrument, Redemption Price, Percentage					100.00%
Debt Instrument, Face Amount									$ 750,000
Debt financing costs, net	$ 13,000
Parent | Senior Notes | 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							9.00%			9.00%
Loss on early extinguishments and modifications of debt			$ (5,976)	$ 0	$ (5,976)	$ 0
Subsidiary, Peninsula Gaming [Member] | Senior Notes | Peninsula Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								8.375%		8.38%
After July 1, 2016 and Prior to 2018 [Member] | Parent | Senior Notes | 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		104.50%
After Apr 1, 2021 and Prior to 2024 [Member] | Parent | Senior Notes | 6.375% Senior Notes Due 2026
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage					103.188%
Prior to August 15, 2014 [Member] | Subsidiary, Peninsula Gaming [Member] | Senior Notes | Peninsula Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percent of Principal, Subject to Make-whole Premium								100.00%

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