So, if I attempt to share a document, I have these options available to me: http://imgur.com/efTUXgY

They include:

     Public on the Web
     Anyone with the link
     lynch.us
     People at lynch.us with the link
     Specific people

Additionally, if I goto https://admin.google.com/AdminHome#AppDetails:service=Drive+..., I have the abilitiy to the set the domain-wide default sharing settings. As seen here: http://imgur.com/RL0eUhZ