At this point Frederick Wiseman’s documentaries are almost beyond reproach. For more than 40 years he’s stuck to the same ascetic storytelling style: no title cards, no voice-over narration, no talking-head interviews, no staged re-creations or archival clips. His films can be demanding, but after one has been poked and prodded by more commercial documentaries, the simple observation of Wiseman’s sweeping institutional studies can be gratifying.