Idea pronounced I-Dear

Take the word idea. Why is it pronounced I-DEAR?
Another example;
The state of Alabama Why is it pronounced ALA-BAMER?
Does anyone know where this came from?
Help me as it's driving me nuts
Gary

I am pretty sure it's a Brooklyn-Italian thing.

I grew up in Rhode Island and pronounced idea as idear. My reasoning is that I dropped the r in words like car, yard, party, Harvard, Bar Harbor, so the r has to go somewhere. I call it the Conservation of r, like energy and matter, r can't be destroyed and is preserved and has to be used somewhere else. I don't do it as often since I moved to California, but the students we looked surprised when I said "I went to a birthday potty (party). Somehow the r just escapes from my words.

Haha, like "lorinauda" (law and order) or "supanover" (supernova).
I call it the Conservation of r, like energy and matter, r can't be destroyed and is preserved and has to be used somewhere else.
Is that why we have Talk Like a Pirate Day? Arrrgh.
Emmett