From what I've read, a lot of bodybuilders do primarily weights, especially in their 'growth' cycle, but add in more cardio (short, intense cardio) during their cutting phase, to reduce body fat.
Doing what body builders do is not necessarily the best idea, as they often go to extremes to get a contest-ready body, and quite a few of them gain fat as well as muscle during their bulking stage (at least the men).
I think doing circuit-type weight workouts, that move quickly from one body part to the next for more calorie burn, would work fine for maintenance. But there are benefits to cardiovascular exercise other than weight loss or maintenance.