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Description of the Business	12 Months Ended
Description of the Business	Dec. 31, 2011
Description of the Business [Abstract]
Description of the Business	Description of the Business ManTech International Corporation (depending on the circumstances, “ManTech” “Company” “we” “our” “ours” or “us”) is a leading provider of innovative technologies and solutions for mission-critical national security programs for the intelligence community; Departments of Defense, State, Homeland Security, Energy and Justice, including the Federal Bureau of Investigations (FBI); the space community; and other U.S. federal government customers. Our services generally include the following solution sets that are aligned with the long-term needs of our national security clients: command, control, communications, computers, intelligence, surveillance and reconnaissance (C4ISR) lifecycle support; cyber security; global logistics support; intelligence/counter-intelligence support, information technology (IT) modernization and sustainment; systems engineering; and test and evaluation. We support major national missions, such as military readiness, terrorist threat detection, information security and border protection. Our employees operate primarily in the United States, as well as numerous locations internationally.