I want to connect my old 23" cinema display to new iMac 5K retina

I have just ordered a brand new iMac with 5K retina display & would like to link up my old 23" Cinema display to it so I can continue to have my dual screen workstation as I have done since 2005.

I could do with a little advice before it arrives as to what adaptor I will need in order to connect the two.

I am currently connected to an old 17" MacBook Pro so am unsure of how it will work with the new iMac?

The old cinema display has a 3-cable configuration (USB / Firewire / DVI cable) connecting from the power adaptor over to my MacBook Pro.