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Income Taxes - Schedule of Income Tax Provision (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal provision	$ 80,852us-gaap_CurrentFederalTaxExpenseBenefit	$ 60,449us-gaap_CurrentFederalTaxExpenseBenefit	$ 70,020us-gaap_CurrentFederalTaxExpenseBenefit
State and local provisions	14,532	2,897	18,174
Foreign provision	2,396us-gaap_CurrentForeignTaxExpenseBenefit	7,083us-gaap_CurrentForeignTaxExpenseBenefit	3,074us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax expense	97,780us-gaap_CurrentIncomeTaxExpenseBenefit	70,429us-gaap_CurrentIncomeTaxExpenseBenefit	91,268us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred	5,748eme_DeferredIncomeTaxExpenseBenefit1	11,857eme_DeferredIncomeTaxExpenseBenefit1	6,626eme_DeferredIncomeTaxExpenseBenefit1
Income tax provision	$ 103,528us-gaap_IncomeTaxExpenseBenefit	$ 82,286us-gaap_IncomeTaxExpenseBenefit	$ 97,894us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.