Other Balance Sheet And Statement Of Earnings Captions (Accrued Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	$ 10,434	$ 9,088
Other Accrued Liabilities [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	3,439	3,424
Accrued Commissions (AGLC) [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	2,401	1,394
Progressive Slot, Table And Track Liability [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	1,866	1,317
Apex Acquisition Liability (Note 3) [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	0	1,494
Player Point Liability [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	727	671
Chip Liability [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	477	567
Off-Track Betting Liability [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	522	167
Deposit Liability [Member]
Accounts Payable And Accrued Liabilities [Line Items]
Accrued liabilities	$ 1,002	$ 621