Is there a site that keeps track of that? It's hard to imagine many people beating Wallace and Miller's +42 in the Cleveland game.
Actually 4 of the Lakers starting 5 did against Cleveland about 2 months ago. But in response to your actual question, I have no idea.
Wow - it's going to be hard to beat Manny Harris's -57 in that game. Will that be his claim to fame in the NBA?
I'm no expert in these "advanced stats", but shouldn't the final scoring margin be subtracted as some kind of normalizer? Otherwise you're just showing that that player was on the court a lot in a game where their team got blown out. EDIT: Or better yet, subtract final score margin x minutes played/48. If this statistic doesn't exist yet, I would like to name it "Playing Time Weighted Normalization of +/-". Or "PLATWENO+".
Couldn't you say that a player with a lot of defensive rebounds in a game "was just near the basket when the opposing team missed a lot of shots"? You could, of course. But so what? A stat is just a stat.