_spBodyOnLoadFunctionNames.push("loadPage"); //ensure the core.js is loaded onto the page before executing

function loadPage() {
    var call = jQuery.ajax({
        url: _spPageContextInfo.webAbsoluteUrl + "/_api/web/currentuser/issiteadmin",
        type: "GET",
        datatype:"json",
        headers: { Accept: "application/json;odata=verbose" }
    });
    call.done(function(data) {
        var isSiteAdmin = data.d.IsSiteAdmin;
        checkActiveUser(isSiteAdmin);
    });
}
function checkActiveUser(isAdmin) {
    if (!isAdmin)
        $("input[id$='id of control without GUID']").css('display', 'none');
        //or $("input[id$='id of control without GUID']").hide();
        //your css to hide the control here
}