Hegel ?

Hegel is not an idealist as he sees all distinctions as imposed by the "mind/matter/geist/x/logos/it/thing/unnamable/selfnaming". As indeed, they seem to be. This is his great leap. The word "geist" is just the X becoming conscious of itself as the imposer of concepts. "Matter" and "mind" are both just products of something that cannot be truly named, but only inferred from fundamental logic.