What is the right way to pronounce the word ‘Detail’?

There is a very very slow process in English of differentiating nouns and verbs fitting a particular pattern (Latin prefix + single syllable) by shifting the accent. a rebel vs. to rebel, for example. Initial-stress-derived noun 

I can’t find online the guess of how many verbs are changing accent per year, but I think it’s one or two. In any case, if they’re saying deTAIL as the verb, they are indeed following that trend.