I see websites that have copied the guy above them, word for word, all the time in the serps. I see spam articles ranking all the time. Same title, same body text, etc, just on different domains. Pretty sure google is mostly concerned with dup content on your own website. as in the same page but different url, same meta descriptions, same titles, etc.
Thats not to say that you should not add content to copied content. Google wants the user to be happy. Make the copied content better, and it might rank better depending on a bunch of other things.