Artifacts with sources and javadocs deployed can be attached to IDEA libraries using downloadSources and downloadJavadocs respectively. The following example shows how to do this in the command-line:
mvn idea:idea -DdownloadSources=true -DdownloadJavadocs=true
or if you prefer putting the configuration in your pom.xml:
<project>
[...]
<build>
[...]
<plugins>
[...]
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-idea-plugin</artifactId>
<version>2.2.1</version>
<configuration>
<downloadSources>true</downloadSources>
<downloadJavadocs>true</downloadJavadocs>
</configuration>
</plugin>
[...]
</plugins>
[...]
</build>
[...]
</project>