Intellij IDEA show javadoc automatically

When I am coding at Netbeans it autocompletes the code and show Javadocs. However when I am using Intellij IDEA if I click Ctrl+Space I can see the auto-complete and if I click Ctrl+Q I can see the javadoc seperately.

Is it possible to see the Javadoc of element whenever I see auto-complete or click Ctrl+Space at Intellij IDEA as like Netbeans?

Solution

Settings | Editor | General |Code Completion | Show the documentation popup in __ ms.

Older versions: Settings | Editor | General |Code Completion | Autopopup documentation in (ms).

UPDATE: latest versions have an option to show JavaDoc on mouse move.