v2.4.1.9

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

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- Definition 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. + References No definition available. + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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