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Sale Of Investment	12 Months Ended
Sale Of Investment	Dec. 31, 2011
Gain (Loss) on Sale of Investments [Abstract]
Sale Of Investment	Sale of Investment On April 8, 2011, ManTech received approximately $3.2 million in proceeds, with an additional $0.5 million held in escrow to be distributed no later than December 15, 2012, for sale of our investment of less than 5% in NetWitness Corporation (NetWitness). The transaction was consummated on April 1, 2011 pursuant to an agreement and plan of merger dated March 12, 2011 by and among EMC Corporation, NetWitness and certain persons acting as the representative for the shareholders of NetWitness. The sale of our investment resulted in a pre-tax gain of approximately $3.7 million, which was recorded in other income in our consolidated statement of income for the year ended December 31, 2011.