In the history of the NFL there have been four seasons where a quarterback has had three receivers catch over 1000 yards apiece. In 1980, Dan Fouts led the Chargers to the first such season. In 1995, Jeff George became the second quarterback to accomplish the feat for the Falcons. In 2004, Peyton Manning broke records while completing the task with the Colts. Finally, Kurt Warner accrued the achievement in 2008 with the Cardinals.
Among the four seasons, only Peyton Manning had his top three receivers account for less than 75% of his total yardage that season. Yet, he split over 65% of his total completions between the same set of targets. Dan Fouts and Jeff George had 70% of their total completions go to their favorite three options, while having 79% of their total yardage accumulated among those same receivers. Kurt Warner had just over 75% of his total yardage come from Larry Fitzgerald, Anquan Boldin, and Steve Breaston, but only 62% of his completions hit among those hands.
The most surprising difference between these seasons was the running support. Manning had the most support with a leading back rushing for 1548 yards, George had 1083 yards of support from the main back, while Fouts only got 659 yards of rushing attack. The lowest rushing total came in Warner's case, to the tune of 514 yards out of the backfield. Not only did Warner have the fewest support in the form of a running game, but he relied the least on his top three receivers in the bulk of his season.
As a side note, in 1989 the Washington Redskins accomplished the feat, however, the quarterback Mark Rypien did not start all 16 games so it goes undocumented in the record books. Gary Clark had 1229 yards, Art Monk had 1186 yards, and Ricky Sanders had 1138 yards receiving.