NYRB reviews many non-fiction books. I would go as far as saying that 3/4 of the books they review are non fiction.

I chose an archived issue at random:

http://www.nybooks.com/issues/2014/jul/10/

There are only 4 works of fiction reviewed there. Everything else is either world politics, finance, or historical events. Science and philosophy are very heavily reviewed also.

If you never read an issue of the NYRB I highly encourage it. It is one of my favorite publications and it's bi-monthly so the quality is very high.

Daniel Mendelsohn's pieces alone are worth the price of a subscription