concourse and detailing can go hand in hand i feel. however i feel that they are two different things, concourse focus on things being clean, whereas detailing focusses more on the finish and durability of that finish.
there are many professional detailers across the country who offer concourse preperation as a service.
i have seen concourse cars that would definetly benefit from the experience of a detailer to improve the paint finish, and vice versa, ive seen detailers who would benefit from a concourse competitor on items such as underbody and engine detailing.
they are two different things, but if you combined the two properly, then the results would be outstanding!