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Segment Reporting and Significant Customer Information - Revenue by Type and Segment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Breakdown of revenues by type and segment    
Revenues $ 40,195 $ 42,177
Travel
    
Breakdown of revenues by type and segment    
Revenues 28,422 26,782
Search
    
Breakdown of revenues by type and segment    
Revenues 4,833 6,573
Local
    
Breakdown of revenues by type and segment    
Revenues 6,940 8,822
North America [Member]
    
Breakdown of revenues by type and segment    
Revenues 26,353 29,911
North America [Member] | Travel
    
Breakdown of revenues by type and segment    
Revenues 17,229 17,490
North America [Member] | Search
    
Breakdown of revenues by type and segment    
Revenues 3,854 5,703
North America [Member] | Local
    
Breakdown of revenues by type and segment    
Revenues 5,270 6,718
Europe [Member]
    
Breakdown of revenues by type and segment    
Revenues 13,842 12,266
Europe [Member] | Travel
    
Breakdown of revenues by type and segment    
Revenues 11,193 9,292
Europe [Member] | Search
    
Breakdown of revenues by type and segment    
Revenues 979 870
Europe [Member] | Local
    
Breakdown of revenues by type and segment    
Revenues $ 1,670 $ 2,104