Other Balance Sheet And Statement Of Earnings Captions (Accrued Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	$ 21,707	$ 15,664
Accrued Commissions (AGLC) [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	1,417	2,262
Progressive Slot, Table And On Track Liability [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	3,921	1,713
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	1,360	682
Chip Liability [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	942	721
Racing-Related Liabilities [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	1,370	355
Deposit Liability [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	376	2,716
Deferrred Rent [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	25	756
Construction Liabilitiy [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities		2,154
Other Accrued Liabilities [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	$ 7,965	$ 4,305