One of the cornerstones of comedy is watching stupid people doing stupid things. However, watching supposedly smart people doing stupid things can be exasperating, which is what we find in the feature films of director Seth Gordon.
The only thing Identity Thief steals is your time and your expectation of inventive comedy. The concept may be high, but the yield (in terms of laughs) is depressingly low.
I'll give Will Ferrell credit for this: There aren't many actors who would make an entire comedy in a foreign language just as a joke. Now -- if only the joke itself were funny...