Here's another resource that may be of interest to you: Capturing Search Engine and PPC info on Landing Pages . Do you have a developer on your team?
Just know that Google blocks all organic and paid search terms when a user is signed into Google (accesses Google via https) - which, if a user has a gmail account, there's a pretty good chance they stay logged in. Originally it was just the organic searches, now it includes paid as well.
Google Starts Blocking Access to Paid Search Keyword Data | Search Engine Watch