Smith, an All-Star with the Atlanta Hawks, was the focus of much attention since the free-agent period began July 1. Some teams had reportedly been trying to lure Smith and Dwight Howard to form a powerful one-two punch on the front line.
Smith, who is 6 foot 9 and 225 pounds, will reportedly sign a four-year, $54-million contract with Detroit when the signing period begins Wednesday. The 27-year-old, a nine-year veteran, has career averages of 15.3 points, 8.0 rebounds and 3.2 assists in 34.1 minutes a game.
The last two seasons, with averages of 18.8 and 17.5 points, 9.6 and 8.4 rebounds, 3.9 and 4.2 assists, have been the most productive for Smith. He averaged 35.3 minutes a game both seasons.
Landry, who played parts of two seasons with Sacramento before joining the Golden State Warriors last year, is expected to sign a four-year, $26-million deal with the Kings.
Landy, 29 and a six-year veteran used mainly as a reserve, has career averages of 11.9 points and 5.3 rebounds in 24.5 minutes a game.
Wire service and Internet reports contributed to this story.