Third-party cookies providers are:
(Third-party cookies are those that are sent to the user's terminal equipment from a machine or domain that is not managed by the publisher, but by another entity that processes data obtained from cookies)
Two cookies (PREF& NID) persistent set by Google Maps applications and managed by Google.
In the following links explains cookies management for different web browsers:
Safari, from http://support.apple.com/kb/ph5042
You can extend more information about cookies at the following links: