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Acquisitions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Dec. 20, 2013
Feb. 04, 2013
Sunbank    
Business Acquisition [Line Items]    
Business acquired $ 51.7us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= esl_SunbankMember
 
Contingent consideration 5us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= esl_SunbankMember
 
Contingent consideration achievement period of certain sales levels 2 years  
Gamesman Group    
Business Acquisition [Line Items]    
Business acquired   $ 40.8us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= esl_GamesmanGroupMember