You'll normally need the fonts. You also need to consider how you're going to deal with Arabic if it's reading from right to left.
You could experiment with having them supplied as PDFs and placing those in the InDesign document.
Presumably ultimately you'll produce four PDFs, one for each language, for printing and/or for PDF circulation.
Thanks for that - yes I will be producing pdfs for print.
Good idea re placing pdf image in the document.
If they were suppling a word document , would it be just copy and paste into text area, I was concerned about how indesign handles english left to right with arabic right to left, Im not sure what Chinese does.
Assuming you don't have the fonts, get them to make a PDF from their Word documents and you can place these. The Arabic version presumably starts at the "back" of the document.
As you're not typesetting (as the copy is being supplied as PDFs), InDesign won't be handling the fonts.
When you've "finalised" the InDesign document I'd get your customer to approve the PDFs before printing!
Thanks for you're help - I think I need some conversations with the customer.