UnitedHealth Group (NYSE:UNH) is the largest managed care company in the U.S. and is due to report earnings Thursday. While it's important to know Wall Street's forecasts for the company, they aren't the be-all and end-all when it comes to analyzing the stock's merits. With the long-term investor in mind, in the following video the Fool's health care bureau chief, Brenton Flynn, highlights a few areas of specific interest,  such as more details on the company's Brazilian expansion.