v2.4.1.9

SHARE-BASED COMPENSATION - RSU Activity - Summary of Change (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Number of Restricted Stock Units [Roll Forward]
RSUs beginning	1,258,685us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
RSUs awarded	645,601us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
RSUs released	(336,229)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
RSUs forfeited	(13,499)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
RSUs ending	1,554,558us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Weighted Average Purchase Price RSUs	$ 0etm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAveragePurchasePrice
Weighted Average Remaining Contractual Term (Years) RSUs	1 year 8 months 12 days
Aggregate Intrinsic Value RSUs	$ 18,887,880etm_AggregateInstrinsicValueOfRestrictedStockUnits
Number of RSUs vested and expected to vest	1,414,787etm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestNumber
Weighted Average Purchase Price of RSUs vested and expected to vest	$ 0etm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestWeightedAveragePurchasePrice
Weighted Average Remaining Contractual Term (Years) of RUSs vested and expected to vest	1 year 7 months 6 days
Aggregate Intrinsic Value RSUs vested and expected to vest	16,161,731etm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestAggregateIntrinsicValue
Number of RSUs exercisable	84,603etm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisable
Weighted Average Purchase Price of RUSs exercisable	$ 0etm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAveragePurchasePriceExcercisable
Weighted Average Remaining Contractual Term (Years) of RUSs exercisable	0 years
Aggregate Intrinsic Value RSUs exercisable	1,027,926etm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExcercisableAggregateInstrinsicValue
Weighted average remaining recognition period in years	2 years 4 months 24 days
Unamortized compensation expense, net of estimated forfeitures	$ 10,435,775etm_UnamortizedCompensationExpenseForRestrictedStockUnits

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As of the balance sheet date, the number of Retricted Stock Units into which fully vested and expected to vest stock options outstanding can be converted under the plan.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB

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-SubTopic 10

-Section 50

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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