LOS ANGELES (Reuters) – Tobey Maguire's boyish looks have played no small part in landing him a succession of roles as the youthful hero in films such as "Spiderman" or the underdog jockey in "Seabiscuit." Now, the 37-year-old actor is finally growing up on screen in "The Details," a dark comedy which marks a return to the lower budget, experimental fare favored by Maguire long before he first donned Peter Parker's blue and red suit. Maguire plays Dr. …