Strip root directory with unpack-dependencies - maven

Question

I have a third-party archive (IntelliJ IDEA CE in my case) that has a root directory whose name I cannot guess. In the unpack-dependencies task, how can I unpack the archive without the root directory?
Currently all files from the archive are extracted into
testproject/target/dependency/IntelliJ-IDEA-CE/idea-IC-141.1532.4/
but I want them to be extracted into just
testproject/target/dependency/IntelliJ-IDEA-CE/
but keep the subdirectory tree.
It would be similar to doing the following on the command line:
cd testproject/target/dependency/IntelliJ-IDEA-CE/
tar -xvf ideaIC-14.1.4.tar.gz --strip 1
I've already installed the archive in my local repository. This is my pom.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.virtlink</groupId>
<artifactId>testproject</artifactId>
<version>0.1</version>
<dependencies>
<dependency>
<groupId>org.jetbrains</groupId>
<artifactId>org.jetbrains.intellij-ce</artifactId>
<version>14.1.4</version>
<type>tar.gz</type>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.10</version>
<executions>
<execution>
<id>unzip-distribution</id>
<goals>
<goal>unpack-dependencies</goal>
</goals>
<configuration>
<includeArtifactIds>org.jetbrains.intellij-ce</includeArtifactIds>
<outputDirectory>${project.build.directory}/dependency/IntelliJ-IDEA-CE</outputDirectory>
<includes>**/*.jar</includes>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<compilerArguments>
<extdirs>${project.build.directory}/dependency/IntelliJ-IDEA-CE/lib/</extdirs>
</compilerArguments>
</configuration>
</plugin>
</plugins>
</build>
</project>