Now if I can only understand what an idler is???
@musicbee: I was thinking more knowledgeable folks would reply but since they haven't thus far, here goes:
An idler wheel turntable is a method of driving the turntable wherein the motor drives a wheel (this is the idler wheel), and this wheel in turn drives the platter. Implementation varies - for example on Lenco L75, the idler wheel drives the plate of the platter (so idler wheel is perpendicular to the plane of the platter). On a Thorens TD 124, the idler wheel drives the rim of the platter (so the idler wheel is parallel to the platter).
This is similar to using a rubber or nylon or similar belt connected to the motor to drive the platter. The idea behind both types of drives is to isolate the motor noise from reaching the platter.
One common thing about idler wheel drives - they have lots of torque.