Call me hypercautious, but in my opinion:
is one thing...getting asked and not having it might be another!
Is "The Globe and Mail" a reliable source, Canada-wise?
If so, according to this article
from June of last year,
An IDP is recommended or required in all South American countries, except Brazil.
I for one wouldn't take a chance on running afoul of such a requirement by way of not acquiring an easy-to-get piece of paper before I traveled outside the protection of my native Government.
But that's just me!