Scaling: How do you document processes and knowledge? I will not promote

The company grew too fast with multiple offices around the world, with each being closed in its own silos. Most of the branches is doing really well, the other (where I’m at) not that much… People simply don’t use any tools for documentation, processes aren’t formalized etc. No strategy, slow growth, arrogant sales people who refuse to get trainings on our own services or provide transparency etc. The COO gave me the mission to tidy up the house. Our idea is to create a wiki (dangerous, I know), populate the basic and convince everybody else to adopt the tool. It’s quite challenging, but I honestly think the company will implode if we keep up like this. What type of advice, books, blogs, whatever should I start with to make sure this project can be successful?