From Brian Kreb's blog
A few caveats are in order here. First, many of the network owners listed are Internet service providers, and are likely included because some of their subscribers were hit. Second, it is not clear how many systems in each of these companies or networks were compromised, for how long those intrusions persisted, or whether the attackers successfully stole sensitive information from all of the victims. Finally, some of these organizations (there are several antivirus firms mentioned below) may be represented because they intentionally compromised internal systems in an effort to reverse engineer malware used in these attacks.
That explains the lack of detail.