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L-3 Holdings' Earnings Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Shares excluded from computation of diluted earnings per share and employee stock purchase plan contributions 0.5us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.9us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 3.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount