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Commitments and Contingencies (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2004
Dec. 31, 2002
Aug. 20, 2015
Loss Contingencies            
Charge in general and administrative expenses $ 1,000 $ 2,000 $ 1,000      
Operating leases, rent expense 5,800,000 $ 5,300,000 $ 5,800,000      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity            
2018 5,320,000          
2019 4,505,000          
2020 3,833,000          
2021 3,205,000          
2022 2,370,000          
Thereafter 3,258,000          
Total 22,491,000          
Purchase Obligation, Fiscal Year Maturity            
2018 1,446,000          
2019 17,000          
2020 11,000          
2021 0          
2022 0          
Thereafter 0          
Total 1,474,000          
Contractual Obligation, Fiscal Year Maturity            
Total Commitments, Due in 2018 6,766,000          
Total Commitments, Due in 2019 4,522,000          
Total Commitments, Due in 2020 3,844,000          
Total Commitments, Due in 2021 3,205,000          
Total Commitments, Due in 2022 2,370,000          
Total Commitments, Due Thereafter 3,258,000          
Total Commitments $ 23,965,000          
Majority Shareholder | Travelzoo Europe Promissory Note            
Loss Contingencies            
Related party debt           $ 5,700,000.0
Stated percentage (percentage)           7.00%
Travel Zoo Com Corporation            
Loss Contingencies            
Period for receiving shares under merger (in years)       2 years 2 years  
Number of shares exchanged under merger         1