IDPs are valid and recognized anywhere, but the problem with it is that people assume you have a valid papers that goes with it, mostly because it is used by tourists....or new migrants...who either haven't been in the country long enough to get a state DL, or was sent by an international company for a brief assignment less than 6 months. It is not a bad idea to get them if you can, but just know that if you are stopped and showed an IDP, there is a risk that you will be asked for more documents (visa).