What is the author's style in Outer Dark by Cormac McCarthy?

The story is written partially in the omniscient narrative. Using this style, the reader understands the thoughts and feelings of the main characters—at least those that are revealed as the author at times tends to withhold more deeply held motivations. However, the reader is introduced to minor characters in a more one-dimensional fashion. That is, the reader meets and sees the characters only as the main characters view them. The reader is not given insight into the thoughts and feelings of those more minor figures. This sub-set of characters maintain a veil of mystery, especially a shadowy group of dangerous men who appear and reappear periodically throughout the story.