Use ESQ to get detail data?

Am I able to use esq to get detail data on a page? Ideally I want to be able to get data from the detail on the parent page, but there will be multiple rows on a detail and I would like to loop through all of them and do calculations with it. I'm not sure how I would be able to get the detail data, there's no lookup connected to it, just the object column and detail column create a relationship in the page designer. I would like to do this with client-side code thanks.