I haven't really done any thorough research on the subject, but I was looking over the design of a standard CMOS inverter, and figured that it should in theory be able to invert a ternary signal without any sort of modification.
It sort of depends on either finding a CMOS gate that either has a relatively low tolerance, or can withstand unusually large voltages (twice the usual).
You simply feed it V_dd = V_0, V_ss = -V_0, and then the output voltage should be as follows: