One who is extremely fond of documentaries. At times to a fault, and at the expense if social standing.

Suffixes with the common part -phil-
Phile(suffix)(-philia, -Philly, -philic) are used to specify an affinity for or an attraction to something.
Documenta(ry)- the object of said attraction
Documentaphilia: the condition or affliction that a Documentaphile suffers from.