As Ryan stated, work on the changes to the details in AutoCAD. It is more efficient. It is not recommended to explode imported files in Revit, because of the way Revit converts various 2D and 3D CAD based geometry into Revit linework and text.
I have imported many AutoCAD details and have had no problem with text. Text is going to convert you SHX file format to TrueType text, but it is not a problem. If after exploding your DWG you do not see text then is it possible the layer in the DWG is turned off in Visibility Graphics>Imported tab for that DWG or on the Annotation tab of VG the text is unchecked.
Mel Persin, AIA