HI. I'm not familiar with isolating. But I do practice emotional detachment. As I grew up I realized that my parents were nuts and I couldn't depend on them for anything. After I grew up I continued. Its just a safe way to not get wrapped up or involved in their lives and have your feelings hurt constantly.
I would think isolating is far more encompassing than just dealing with alcoholic parents and trying to survive with emotional detachment. I would think it is not relating to anyone and being alone emotionally if not physically.