Commitments and Contingencies (Details) $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 28, 2012 claim	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2004	Dec. 31, 2002 shares
Loss Contingencies
Charge in general and administrative expenses		$ 1	$ 2
Operating Leases, Future Minimum Payments Receivable [Abstract]
2015		1,388	1,388
2016		4,576	4,576
2017		3,790	3,790
2018		3,205	3,205
2019		2,857	2,857
Thereafter		10,254	10,254
Total		26,070	26,070
Purchase Obligation, Fiscal Year Maturity [Abstract]
2015		371	371
2016		1,046	1,046
2017		438	438
2018		365	365
2019		0	0
Thereafter		0	0
Total		2,220	2,220
Long-term Debt, Fiscal Year Maturity [Abstract]
2015		99	99
2016		396	396
2017		396	396
2018		5,911	5,911
2019		0	0
Thereafter		0	0
Total		6,802	6,802
Contractual Obligation, Fiscal Year Maturity [Abstract]
Total Commitments, Due in Next Fiscal Year		1,858	1,858
Total Commitments, Due in Second Year		6,018	6,018
Total Commitments, Due in Third Year		4,624	4,624
Total Commitments, Due in Fourth Year		9,481	9,481
Total Commitments, Due in Fifth Year		2,857	2,857
Total Commitments, Due after Fifth Year		10,254	10,254
Total commitments		35,092	35,092
Local deals and getaway merchant payables		$ 16,600	$ 16,600	$ 21,500
Pending Litigation | Metsearch Systems, LLC v.s. Travelzoo Inc. d/b/a Fly.com
Loss Contingencies
Number of patents allegedly infringed | claim	1
Pending Litigation | Unclaimed Property Audits Related to Unexchanged Promotional Shares
Loss Contingencies
Unexchanged promotional shares					$ 22,000	$ 3,000	$ 20,000
Increase (decrease) in reserve for unexchanged shares				$ 7,600
Travel Zoo Com Corporation [Member]
Loss Contingencies
Period for receiving shares under merger								2 years	2 years
Number of shares exchanged under merger | shares									1