For some reason intelliJ doesn’t let you import code style guides.
Like the Java one I wanted to use from Google.

To import the style guide (intellij-java-google-style.xml) after cloning the repository, to this.

> cd ~/Library/Preferences/IntelliJIdeaXX
> mkdir codestyles
> cp /intellij-java-google-style.xml .

Fire up intelliJ, goto preferences, search for Coding Style, and you should see Google Coding style there.

Screen Shot 2015-08-07 at 2.19.55 PM

Links that help