Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities
Net income (loss)	$ 35,103us-gaap_ProfitLoss	$ (11,225)us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	51,942us-gaap_DepreciationAndAmortization	66,179us-gaap_DepreciationAndAmortization
Amortization of debt financing costs	4,199us-gaap_AmortizationOfFinancingCosts	4,829us-gaap_AmortizationOfFinancingCosts
Amortization of discounts on debt	1,127	1,257
Loss on early extinguishments of debt	508	154
Share-based compensation expense	3,441us-gaap_ShareBasedCompensation	6,481us-gaap_ShareBasedCompensation
Deferred income taxes	5,394us-gaap_DeferredIncomeTaxExpenseBenefit	4,143us-gaap_DeferredIncomeTaxExpenseBenefit
Income (Loss) from Equity Method Investments	(4,014)	0
Impairments of assets	1,065us-gaap_AssetImpairmentCharges	1,633us-gaap_AssetImpairmentCharges
Other operating activities	(1,559)	(199)
Changes in operating assets and liabilities:
Restricted cash	(3,358)	(10,267)
Accounts receivable, net	1,440	3,830
Inventories	968us-gaap_IncreaseDecreaseInInventories	1,223us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(615)	(1,891)
Current other tax asset	1,802	50
Income taxes receivable	(4)	(33)
Other assets, net	1,581	(1,504)
Accounts payable and accrued liabilities	(19,725)	(9,695)
Other long-term tax liabilities	(23,002)	605
Other liabilities	3,345	1,599
Net cash provided by operating activities	59,638	57,169
Cash Flows from Investing Activities
Capital expenditures	(19,269)	(18,306)
Other investing activities	2,316	1,112
Net cash used in investing activities	(16,953)	(17,194)
Cash Flows from Financing Activities
Borrowings under Boyd Gaming bank credit facility	203,700us-gaap_ProceedsFromLinesOfCredit	188,500us-gaap_ProceedsFromLinesOfCredit
Payments under Boyd Gaming bank credit facility	(245,675)us-gaap_RepaymentsOfLinesOfCredit	(224,275)us-gaap_RepaymentsOfLinesOfCredit
Borrowings under Peninsula bank credit facility	91,400	75,000
Payments under Peninsula bank credit facility	(108,625)	(90,525)
Borrowings under Borgata bank credit facility	0byd_ProceesFromLinesOfCreditBorgata	116,200byd_ProceesFromLinesOfCreditBorgata
Payments under Borgata bank credit facility	0byd_RepaymeentsOfLinesOfCreditBorgata	(119,400)byd_RepaymeentsOfLinesOfCreditBorgata
Debt financing costs	0us-gaap_PaymentsOfDebtIssuanceCosts	(71)us-gaap_PaymentsOfDebtIssuanceCosts
Payments on long-term debt	(2)us-gaap_RepaymentsOfNotesPayable	(952)us-gaap_RepaymentsOfNotesPayable
Payments on retirements of long-term debt	(2)byd_PaymentsOnRetirementsOfLongTermDebt	(952)byd_PaymentsOnRetirementsOfLongTermDebt
Stock options exercised	4,419	757
Restricted stock units released, net	0	(200)
Performance Stock, Value, Shares Issued Net of Tax Withholdings	(2,446)	0
Other financing activities	0	31
Net cash used in financing activities	(57,229)	(54,935)
Change in cash and cash equivalents	(14,544)	(14,960)
Cash and cash equivalents, beginning of period	145,341	177,838
Cash and cash equivalents, end of period	130,797	162,878
Supplemental Disclosure of Cash Flow Information
Cash paid for interest, net of amounts capitalized	52,239us-gaap_InterestPaid	80,541us-gaap_InterestPaid
Cash paid (received) for income taxes, net of refunds	(1,656)us-gaap_IncomeTaxesPaidNet	84us-gaap_IncomeTaxesPaidNet
Supplemental Schedule of Noncash Investing and Financing Activities
Payables incurred for capital expenditures	7,333	12,478
Parent
Cash Flows from Operating Activities
Net income (loss)		(6,182)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,287	1,627
Loss on early extinguishments of debt	0	0
Impairments of assets	0	320
Changes in operating assets and liabilities:
Net cash provided by operating activities	(26,888)	(20,187)
Cash Flows from Investing Activities
Capital expenditures	(6,152)	(4,683)
Net cash used in investing activities	(6,152)	(4,023)
Cash Flows from Financing Activities
Debt financing costs		(71)
Payments on long-term debt	0	0
Stock options exercised	4,419	757
Restricted stock units released, net		(200)
Performance Stock, Value, Shares Issued Net of Tax Withholdings	(2,446)
Net cash used in financing activities	33,813	24,210
Change in cash and cash equivalents	773	0
Cash and cash equivalents, beginning of period	2	0
Cash and cash equivalents, end of period	$ 775	$ 0

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).

+ References

No definition available.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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-Publisher FASB

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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The cash outflow for a borrowing supported by a written promise to pay an obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Topic 230

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- Definition

The value of restricted shares issued as compensation, net of the value of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

+ References

No definition available.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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