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Long-Term Debt (Schedule of Boyd Bank Credit Facility) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Line of Credit Facility [Line Items]      
Borrowings under Boyd Gaming bank credit facility $ 223,900 $ 203,700  
Loss on early extinguishments of debt 427 508  
Parent      
Line of Credit Facility [Line Items]      
Loss on early extinguishments of debt 0 $ 0  
Bank Credit Facility | Swing Loan [Member]      
Line of Credit Facility [Line Items]      
Amount outstanding 7,600   $ 6,000
Bank Credit Facility | Parent      
Line of Credit Facility [Line Items]      
Amount outstanding 903,275   1,209,725
Bank Credit Facility | Parent | Initial Term Loan      
Line of Credit Facility [Line Items]      
Amount outstanding 177,025   183,275
Bank Credit Facility | Parent | Incremental Term Loan [Member]      
Line of Credit Facility [Line Items]      
Amount outstanding 726,250   730,750
Bank Credit Facility | Parent | Swing Loan [Member]      
Line of Credit Facility [Line Items]      
Amount outstanding 0   55,700
Bank Credit Facility | Subsidiary, Peninsula Gaming [Member]      
Line of Credit Facility [Line Items]      
Amount outstanding $ 643,225   $ 662,750