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Condensed Consolidating Financial Information (Narrative) (Details) | Dec. 31, 2018 | Jun. 25, 2018 | Dec. 31, 2017 | Mar. 28, 2016 | May 21, 2015 | Nov. 10, 2010
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For the year ending December 31, |  |  |  |  |  |
Subsidiaries, Ownership Percentage | 80.00% |  |  |  |  |
Boyd |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Subsidiaries, Ownership Percentage |  |  |  |  |  | 100.00%
Boyd | Senior Notes | 6.000% Senior Notes Due 2026 [Member] |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Debt instrument, stated interest rate | 6.00% | 6.00% |  |  |  |
Subsidiaries, Ownership 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% |  | 6.875% | 6.875%
Subsidiaries, Ownership Percentage |  |  |  |  | 100.00% |
Boyd | Senior Notes | Senior Notes Due 2026 [Member] |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Debt instrument, stated interest rate | 6.375% |  | 6.375% | 6.375% | 6.375% |
Subsidiaries, Ownership Percentage |  |  |  |  | 100.00% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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