IntelliJ IDEA 14 is finally out, and it includes Thymeleaf support!
A lot of people had been asking for this support from JetBrains along the last months: https://youtrack.jetbrains.com/issue/IDEA-95073 and it seems the IntelliJ folks were listening and this new version of their IDE includes really great support for Thymeleaf.
I think this is great for two reasons: first, because it means now Thymeleaf is supported in two of the most used Java IDEs out there: Eclipse IDE and IntelliJ IDEA, and second, because I myself am an IntelliJ IDEA user, and I have developed an important portion of what today is Thymeleaf using IntelliJ with a free Open Source Project license that JetBrains gave to us (thanks!!). So now Thymeleaf is supported by the IDE that a good part of it was developed with! :-)