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Condensed Consolidating Financial Information (Narrative) (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 28, 2016 | May 21, 2015 | Nov. 10, 2010
--- | --- | --- | --- | --- | ---
For the year ending December 31, |  |  |  |  |
Subsidiaries, Ownership Percentage | 80.00% |  |  |  |
Boyd |  |  |  |  |
For the year ending December 31, |  |  |  |  |
Subsidiaries, Ownership Percentage |  |  |  |  | 100.00%
Long-term Debt, Gross | $ 3,121,558,000 | $ 3,283,129,000 |  |  |
Boyd | Senior Notes | 6.000% Senior Notes Due 2026 [Member] |  |  |  |  |
For the year ending December 31, |  |  |  |  |
Debt instrument, stated interest rate | 6.00% |  |  |  |
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% |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Boyd | Senior Notes | 6.000% Senior Notes Due 2026 [Member] |  |  |  |  |
For the year ending December 31, |  |  |  |  |
Long-term Debt, Gross | $ 700.0 |  |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Boyd | Senior Notes | Senior Notes Due 2023 [Member] |  |  |  |  |
For the year ending December 31, |  |  |  |  |
Long-term Debt, Gross | 750,000,000 | $ 750,000,000 |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Boyd | Senior Notes | Senior Notes Due 2026 [Member] |  |  |  |  |
For the year ending December 31, |  |  |  |  |
Long-term Debt, Gross | $ 750,000,000 | $ 750,000,000 |  |  |

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