While there are various methods utilized for re-using AutoCAD details, not all of them are good solutions and some can add corruption to your Revit project file and create problems.
The best long-term solution for re-using AutoCAD details is to migrate the details into Revit native entities. While inserting and then exploding details is a common practice, it creates residual information in the file and requires time and effort to clean up.
My recommended practice to migrate AutoCAD details to Revit is basically a quick 3-step process:
Link the AutoCAD detail into Revit; Trace the AutoCAD linework with Revit tools to create native Revit elements; Remove linked AutoCAD detail Link the AutoCAD Detail into Revit
Create a new Drafting View from the View tab and the Create panel. Name the view per your company’s naming standards and specific to the detail that you will create. Set the scale appropriate to the detail. On the Insert tab, select the Link CAD function from the Link panel. Select the desired AutoCAD detail and select positioning to be “Auto – Center to Center”.