Caterpillar Inc. doubled its flexible workforce in 2010, the maker of heavy equipment reported Thursday.

The Peoria, Ill.-based company added 11,046 people to its flexible workforce in 2010 for a total of 22,066 people. Caterpillar's flexible workforce includes workers from employment agencies as well as part-time and temporary Caterpillar employees. Approximately half of 2010's increase in flexible workers took place in the U.S.

Caterpillar's full-time workforce rose by 11.4 percent in 2010 to 104,490.

The company posted revenue of $42.59 billion in 2010.