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Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]    
Goodwill, Beginning, Balance $ 91,002 $ 63,308
Business combination 1,723 26,830
Measurement period adjustments 642 389
Foreign currency translation adjustments 4,822 475
Goodwill, Ending, Balance 98,189 91,002
IT professional services [Member]    
Goodwill [Line Items]    
Goodwill, Beginning, Balance 43,874 34,150
Business combination 1,723 9,113
Measurement period adjustments 614 389
Foreign currency translation adjustments 2,192 222
Goodwill, Ending, Balance 48,403 43,874
Software services [Member]    
Goodwill [Line Items]    
Goodwill, Beginning, Balance 47,128 29,158
Business combination 17,717
Measurement period adjustments 28
Foreign currency translation adjustments 2,630 253
Goodwill, Ending, Balance $ 49,786 $ 47,128