Well, maybe documenting everything is good, but what's more important is to make sure that the documentation is properly organized, which is exactly what OP is asking about. I've seen many wikis/confluences with multiple documents per topic, i.e. the author of the second document didn't know that the first one existed at all. In such cases, company wikis get cumbersome as they are polluted with knowledge.

I would say that the culture + making sure your projects and teams are well organized is the key to success. In addition, I'd recommend to follow some protocol when documenting things. This will make both writing and reading a less intense and more predictable task, resulting to a better overall experience.