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Goodwill and Other Intangibles - Estimated Amortization Expense of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
2015 $ 880us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 865us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 734us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 562us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 28us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Total $ 3,069esi_EstimatedFiveYearIntangibleAmortizationExpenseNet