Condensed Consolidating Financial Information (Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents, end of period	$ 130,797	$ 145,341	$ 162,878	$ 177,838
Other Assets, Current	101,237us-gaap_OtherAssetsCurrent	96,609us-gaap_OtherAssetsCurrent
Property and equipment, net	2,250,796us-gaap_PropertyPlantAndEquipmentNet	2,286,108us-gaap_PropertyPlantAndEquipmentNet
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	226,732	222,717
Interest Receivable	0byd_IntercompanyReceivable	0byd_IntercompanyReceivable
Other Noncurrent Assets	104,336byd_OtherNoncurrentAssets	108,590byd_OtherNoncurrentAssets
Intangible assets, net	927,576	934,249
Goodwill, net	685,310us-gaap_Goodwill	685,310us-gaap_Goodwill
Total assets	4,426,784us-gaap_Assets	4,478,924us-gaap_Assets
Liabilities and Stockholders’ Equity
Current maturities of long-term debt	27,688us-gaap_LongTermDebtCurrent	29,753us-gaap_LongTermDebtCurrent
Current liabilities	306,377us-gaap_OtherLiabilitiesCurrent	327,442us-gaap_OtherLiabilitiesCurrent
Accumulated losses of subsidiaries in excess of investment	0	0
Intercompany payable	0byd_IntercompanyPayable	0byd_IntercompanyPayable
Long-term debt, net of current maturities	3,376,097us-gaap_LongTermDebtNoncurrent	3,431,638us-gaap_LongTermDebtNoncurrent
Other long-term liabilities	237,747	252,004
Common stock	1,104us-gaap_CommonStockValue	1,093us-gaap_CommonStockValue
Additional paid-in capital	927,515us-gaap_AdditionalPaidInCapital	922,112us-gaap_AdditionalPaidInCapital
Retained earnings (deficit)	(450,012)	(485,115)
Accumulated other comprehensive income (loss)	218	(53)
Total Boyd Gaming Corporation stockholders’ equity	478,825us-gaap_StockholdersEquity	438,037us-gaap_StockholdersEquity
Noncontrolling interest	50us-gaap_MinorityInterest	50us-gaap_MinorityInterest	175,437us-gaap_MinorityInterest	180,450us-gaap_MinorityInterest
Total stockholders’ equity	478,875	438,087	646,819	650,437
Total liabilities and stockholders’ equity	4,426,784	4,478,924
Parent
Assets
Cash and cash equivalents, end of period	775	2	0	0
Other Assets, Current	11,211	10,234
Property and equipment, net	58,015	65,365
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	3,416,980	3,345,735
Interest Receivable	0	0
Other Noncurrent Assets	35,708	36,600
Intangible assets, net	0	0
Goodwill, net	0	0
Total assets	3,522,689	3,457,936
Liabilities and Stockholders’ Equity
Current maturities of long-term debt	21,500	21,500
Current liabilities	71,938	82,711
Accumulated losses of subsidiaries in excess of investment	0	0
Intercompany payable	742,125	668,310
Long-term debt, net of current maturities	2,165,985	2,207,490
Other long-term liabilities	42,316	39,888
Common stock	1,104	1,093
Additional paid-in capital	927,515	922,112
Retained earnings (deficit)	(450,012)	(485,115)
Accumulated other comprehensive income (loss)	218	(53)
Total Boyd Gaming Corporation stockholders’ equity	478,825	438,037
Noncontrolling interest	0	0
Total stockholders’ equity	478,825	438,037
Total liabilities and stockholders’ equity	3,522,689	3,457,936
Guarantor Subsidiaries
Assets
Cash and cash equivalents, end of period	98,105	111,452	102,987	106,445
Other Assets, Current	70,428	69,012
Property and equipment, net	1,757,614	1,775,486
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	137,237	150,694
Interest Receivable	1,720,432	1,637,101
Other Noncurrent Assets	9,271	9,149
Intangible assets, net	424,823	425,083
Goodwill, net	212,794	212,794
Total assets	4,430,704	4,390,771
Liabilities and Stockholders’ Equity
Current maturities of long-term debt	0	0
Current liabilities	158,951	160,542
Accumulated losses of subsidiaries in excess of investment	0	0
Intercompany payable	0	0
Long-term debt, net of current maturities	0	0
Other long-term liabilities	148,777	169,824
Common stock	31,124	31,124
Additional paid-in capital	2,717,938	2,717,841
Retained earnings (deficit)	1,373,696	1,311,492
Accumulated other comprehensive income (loss)	218	(52)
Total Boyd Gaming Corporation stockholders’ equity	4,122,976	4,060,405
Noncontrolling interest	0	0
Total stockholders’ equity	4,122,976	4,060,405
Total liabilities and stockholders’ equity	4,430,704	4,390,771
Non-Guarantor Subsidiaries (100% Owned)
Assets
Cash and cash equivalents, end of period	31,698	33,668	30,672	33,766
Other Assets, Current	29,173	21,980
Property and equipment, net	435,167	445,257
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0	0
Interest Receivable	0	0
Other Noncurrent Assets	59,357	62,841
Intangible assets, net	502,753	509,166
Goodwill, net	472,516	472,516
Total assets	1,530,664	1,545,428
Liabilities and Stockholders’ Equity
Current maturities of long-term debt	6,188	8,253
Current liabilities	75,736	84,427
Accumulated losses of subsidiaries in excess of investment	237	3,619
Intercompany payable	986,747	972,425
Long-term debt, net of current maturities	1,210,112	1,224,148
Other long-term liabilities	46,654	42,292
Common stock	(27)	(27)
Additional paid-in capital	248,203	248,203
Retained earnings (deficit)	(1,043,404)	(1,037,860)
Accumulated other comprehensive income (loss)	218	(52)
Total Boyd Gaming Corporation stockholders’ equity	(795,010)	(789,736)
Noncontrolling interest	0	0
Total stockholders’ equity	(795,010)	(789,736)
Total liabilities and stockholders’ equity	1,530,664	1,545,428
Non-Guarantor Subsidiaries (Not 100% Owned)
Assets
Cash and cash equivalents, end of period	219	219	29,219	37,627
Other Assets, Current	0	0
Property and equipment, net	0	0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0	0
Interest Receivable	0	0
Other Noncurrent Assets	0	0
Intangible assets, net	0	0
Goodwill, net	0	0
Total assets	219	219
Liabilities and Stockholders’ Equity
Current maturities of long-term debt	0	0
Current liabilities	0	0
Accumulated losses of subsidiaries in excess of investment	0	0
Intercompany payable	438	397
Long-term debt, net of current maturities	0	0
Other long-term liabilities	0	0
Common stock	0	0
Additional paid-in capital	4,250	4,250
Retained earnings (deficit)	(4,469)	(4,428)
Accumulated other comprehensive income (loss)	0	0
Total Boyd Gaming Corporation stockholders’ equity	(219)	(178)
Noncontrolling interest	0	0
Total stockholders’ equity	(219)	(178)
Total liabilities and stockholders’ equity	219	219
Eliminations
Assets
Cash and cash equivalents, end of period	0	0	0	0
Other Assets, Current	(9,575)	(4,617)
Property and equipment, net	0	0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(3,327,485)	(3,273,712)
Interest Receivable	(1,720,432)	(1,637,101)
Other Noncurrent Assets	0	0
Intangible assets, net	0	0
Goodwill, net	0	0
Total assets	(5,057,492)	(4,915,430)
Liabilities and Stockholders’ Equity
Current maturities of long-term debt	0	0
Current liabilities	(248)	(238)
Accumulated losses of subsidiaries in excess of investment	(237)	(3,619)
Intercompany payable	(1,729,310)	(1,641,132)
Long-term debt, net of current maturities	0	0
Other long-term liabilities	0	0
Common stock	(31,097)	(31,097)
Additional paid-in capital	(2,970,391)	(2,970,294)
Retained earnings (deficit)	(325,823)	(269,204)
Accumulated other comprehensive income (loss)	(436)	104
Total Boyd Gaming Corporation stockholders’ equity	(3,327,747)	(3,270,491)
Noncontrolling interest	50	50
Total stockholders’ equity	(3,327,697)	(3,270,441)
Total liabilities and stockholders’ equity	$ (5,057,492)	$ (4,915,430)

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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