What we recommend is pulling in the Google Analytics data into your CRM/form. It will include all Adwords data, and you can then run cost/revenue analysis from your CRM.

Alternatively, grab the gclid into a hidden form, and then do an upload into the new Google Adwords business center, of the GCLID, and the lead value. You can then run reports off of that data. See:
http://adwords.blogspot.com/2013/09/measure-optimize-for-offline-sales-with.html