File contents remains in terminal after exiting Vim?

I'm using the stock terminal with zsh and vim. After I exit vim, the file contents remains in the terminal. Ideally, only the previous history would be in the terminal when I exit vim (such as the behavior I've seen with linux/bash).

How can I accomplish that?

Update

I'm running os x Yosemite 10.10.1

I tried glenn jackman's suggestion below, but still no dice.

Additional information:

echo $TERM produces ansi

I also tried in bash with the same results.

I also tried removing .vimrc completely with the same results.