Valve's employee handbook: https://assets.sbnation.com/assets/1074301/Valve_Handbook_Lo...
They seem to have a high ownership, consensus driven organizational structure. The only time I'm aware the consensus model was violated was when Gabe overruled a veto to ship Steam with half life 2.
It's very interesting to me because it seems to operate similarly to a lot of anarchist shit I've been involved in, but at a highly effective level. And they make oodles of money.