The quickest way to find the ID is to look up the company on the LinkedIn website. The URL that comes back contains the company ID. For example, searching for SourceCoast Web Development returns to the URL
www.linkedin.com/company/365848?trk=tyah. Our company ID is 365848.
Sorry for the confusion. We already have an issue in our tracker for an upcoming release to try to make it clearer/improve this parameter.