The Space Details macro allows you to display basic information about the current space on a page. This information is available at all times from Space Tools > Overview.
We ended support for the Space Details macro in Confluence 7.0, and hid it from the macro browser. Any existing instances of this macro will still work, but you won't be able to insert this macro into the editor using the macro browser:
End of support means Atlassian will not fix bugs related to these macros in Confluence 7.0 or later versions.
To check whether a macro is used in your site, go to General Configuration > Macro Usage.