If you are attaching it like
$("#Detail").ckeditor(config);
than you will need to use something like this
var editor = $('#Detail').ckeditorGet();
editor.updateElement();
I use this example function to submit my form in this case
function SubmitEvent(){
var editor = $('#Detail').ckeditorGet();
editor.updateElement();
if($("#EventForm").valid()) {
$('#EventForm').submit();
}
}