We have over a thousand documents that I need to verify whether they are being shared and if so with whom. There doesn't appear to be a way to list all users granted access whether internal or external. Is there a way to do so?
How do I list all users that documents are shared with in Google Docs/Drive?
google apps
Take a look at FlashPanel for Google Apps.  Once you scan all your assets you might be able to filter Docs (assets) as you want.Available in the Marketplace here.https://www.google.com/enterprise/marketplace/viewListing?productListingId=14304+18345705634006699039&category=&query=flashpanel