If you are on OSX you can easily open man documentation using Preview. Just replace ls with command you would like to see documentation for.

 man -t "ls" | open -f -a /Applications/Preview.app/

If you plan to do this often, you can make your life much easier by putting this inside your .bash_profile.

 pman ()
   man -t "${1}" | open -f -a /Applications/Preview.app/

Now you can use following to view documentation in Preview

 pman ls

Credit goes to John W. Long.