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Other Balance Sheet And Statement Of (Loss) Earnings Captions (Accrued Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounts Payable And Accrued Liabilities [Line Items]    
Accrued liabilities $ 12,486 $ 21,707
Accrued Commissions (AGLC) [Member]    
Accounts Payable And Accrued Liabilities [Line Items]    
Accrued liabilities   1,417
Progressive Slot, Table And On Track Liability [Member]    
Accounts Payable And Accrued Liabilities [Line Items]    
Accrued liabilities 3,105 3,921
Insurance Liability [Member]    
Accounts Payable And Accrued Liabilities [Line Items]    
Accrued liabilities   4,331
Player Point Liability [Member]    
Accounts Payable And Accrued Liabilities [Line Items]    
Accrued liabilities 1,016 1,360
Chip Liability [Member]    
Accounts Payable And Accrued Liabilities [Line Items]    
Accrued liabilities 542 942
Racing-Related Liabilities [Member]    
Accounts Payable And Accrued Liabilities [Line Items]    
Accrued liabilities 1,046 1,370
Deposit Liability [Member]    
Accounts Payable And Accrued Liabilities [Line Items]    
Accrued liabilities 309 376
Other Accrued Liabilities [Member]    
Accounts Payable And Accrued Liabilities [Line Items]    
Accrued liabilities $ 6,468 $ 7,990