Thomas H. Lee Partners LP agreed to buy CompuCom Systems Inc., a provider of information technology services, from private-equity firm Court Square Capital Partners for an undisclosed amount.

The purchase of CompuCom, which had $2.3 billion of gross revenue in 2012, is expected to close in the second quarter, according to a statement Monday from the Dallas-based company. Court Square Capital, based in New York, and IIM Acquisition Corp., an affiliate of Court Square, bought the company in 2007 for $628 million.

Thomas H. Lee has backed business processing and managed IT services firms in the past. The Boston-based firm in 2010 invested in Systems Maintenance Services, a provider of managed IT maintenance services to corporations for hardware infrastructure. It also backed Fidelity National Information Services Inc., a provider of banking and payments technologies.

Citigroup Global Markets Inc., JPMorgan Chase & Co., BMO Capital Markets and Jefferies Finance LLC are offering committed financing for the deal. BMO Capital Markets and Jefferies LLC are financial advisers.