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Estimated Amortization of Identified Intangible Assets for Next Five Years (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Expected Amortization Expense [Line Items]  
Finite-Lived Intangible Assets, Amortization Expense, Year One $ 349els_FiniteLivedIntangibleAssetsAmortizationExpenseYearOne
Estimated amortization of identified intangible assets, year ending December 31, 2013 251us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Estimated amortization of identified intangible assets, year ending December 31, 2015 87us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Estimated amortization of identified intangible assets, year ending December 31, 2016 87us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 87us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive