Earnings Per Share - Additional Information (Details) (Contingent Convertible Preferred Stock, Caliburn Acquisition)	12 Months Ended
	Dec. 31, 2010	Apr. 30, 2010
Earnings Per Share Disclosure [Line Items]
Conversion to common stock shares if revenue targets are achieved (shares)		1,099,877
Tranche One - Performance Stock [Member]
Earnings Per Share Disclosure [Line Items]
Conversion to common stock shares if revenue targets are achieved (shares)		659,926
Revenue target period	3 years
Tranche Two - Performance Stock [Member]
Earnings Per Share Disclosure [Line Items]
Conversion to common stock shares if revenue targets are achieved (shares)		439,951
Revenue target period	5 years