They’ll go after the company he worked for, the cities and counties involved, insurance companies, the state, the gunmaker, the ammunition company, media who didn’t back them to the hilt, etc., etc.
Mainly the Homeowner’s association (see early article at http://www.rawstory.com/rs/2012/04/09/zimmermans-homeowners-association-could-owe-millions-in-martin-case/ ). That’s the deep pocket most closely tied as having acknowledged and will be purported to have condoned all his activity. While they should fight it and win, insurance companies for the association will likely settle if the thugs parents don’t get too greedy. It’s all about weighing the risk - how much will it cost to defend and what are the odds of losing - and how much.
The civil case has already been settled out of court. The parents received a large settlement from the HOA’s insurance company in April.