First, congrats on having done more work than 99.5% of everyone who "has a great game idea that will really take off."
Since you're in marketing, it's now time to start marketing.. but not to the public, to people who are in a position to provide resources.
You don't say where you are located, but in many cities/states there are 'incubator' programs that assist small companies looking for business assistance. (here in Seattle, we even have one specifically for gaming startups). See what kind of resources are available where you are and what kind of networking events they have.
Think of it this way... you have a movie script and you want someone to make a good, but not block-buster budget movie from it. In your favor is the fact that you have a full script, while most people only have a 2-page plot synopsis (to use the movie analogy)
Also, and I presume you're familiar with this-- Going from a written description of a game to a game is more than just implementing what's in the document. Going from "paper" to "fun" is often a long road with many twists and turns.
This is what I was looking for. I love the movie script analogy because I think that it most accurately describes my situation. Of course, while 'filming' some of the script will be changed, but the script 1.0 is done.
So, seeing as I have no actual development experience, I should find a team of (possibly independent) developers and then find an individual or company to sponsor the resources for the development? I am aware that if someone invests the money for the production, it is likely that they'll be asking for something around 99% return on all future profits, but I don't care; the important thing is that my name/logo appears on the finished game. I've come to realize that good ideas for games are actually extremely easy to come by, it's the implementation and good management of opportunity cost that makes the difference.