If its only document editing and browsing then a tablet will do. Check out Microsoft Surface Pro 3. I like it, the stylus makes it easier to use than a keypad/keyboard. Also, MS Office functionality makes it a winner compared to Apple and Android... but if there is internet connectivity or 3G then using Google Docs is the way to go, in which case even a phablet can be used. I personally use an Android mobile with a dictation app though the default Google Swype keyboard is good for basic content typing.
For lots of typing or work then I definitely recommend at least checking out the new Surface Pro 3, its by far the best tablet I've seen and used compared to both Android and Apple tablets that I have used.