The International Alliance of Theatrical Stage Employees has reached a three-year agreement with Fremantle Media.
The agreement covers domestic programs produced for network and basic cable.
Fremantle's programs include "American Idol," "America's Got Talent" and the upcoming "The X Factor."
As for IATSE, it represents makeup artists, lighting specialists and other production-crew workers.
"This new enhanced agreement underlines our commitment to working with Fremantle Media North America on some of the biggest programming brands in television," the union's president said in a written statement.
In the statement, Fremantle's executive VP of production, Dan Goldberg, said, "When it comes to production, we pride ourselves on a consistent high level of quality and creativity. Members of the IA are the best at their crafts, so it only makes sense to work with them all the time."
Last November, the union called a strike on NBC's "The Biggest Loser," which is produced by Reveille Productions, 25/7 Productions and 3 Ball Productions. The strike lasted two weeks.