If you're looking for some specific strength it's a good idea. Kinda along the lines of grease the groove to an extent. Same as the demands of most strength programs.
I don't really see any "detriment" in terms of losing conditioning at all though. As long as you're using compound exercises that hit all of the body's muscles.
I'm pretty sure if you used like triceps kickbacks and biceps curls and situps it wouldn't work too well.