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Reportable Segments and Geographic Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of net income to gross margin
Net income (loss)									$ 125,882us-gaap_ProfitLoss	$ 155,742us-gaap_ProfitLoss	$ (37,169)us-gaap_ProfitLoss
Selling, general and administrative									377,754us-gaap_SellingGeneralAndAdministrativeExpense	358,173us-gaap_SellingGeneralAndAdministrativeExpense	375,647us-gaap_SellingGeneralAndAdministrativeExpense
Depreciation and amortization									386,071us-gaap_DepreciationDepletionAndAmortization	327,505us-gaap_DepreciationDepletionAndAmortization	346,177us-gaap_DepreciationDepletionAndAmortization
Long-lived asset impairment	20,700us-gaap_AssetImpairmentCharges	12,400us-gaap_AssetImpairmentCharges	9,800us-gaap_AssetImpairmentCharges	3,800us-gaap_AssetImpairmentCharges	3,900us-gaap_AssetImpairmentCharges	4,500us-gaap_AssetImpairmentCharges	16,600us-gaap_AssetImpairmentCharges	3,600us-gaap_AssetImpairmentCharges	46,679us-gaap_AssetImpairmentCharges	28,637us-gaap_AssetImpairmentCharges	136,614us-gaap_AssetImpairmentCharges
Restructuring charges	2,200us-gaap_RestructuringAndRelatedCostIncurredCost			4,800us-gaap_RestructuringAndRelatedCostIncurredCost					7,553us-gaap_RestructuringAndRelatedCostIncurredCost		6,471us-gaap_RestructuringAndRelatedCostIncurredCost
Interest expense									114,178us-gaap_InterestExpense	115,745us-gaap_InterestExpense	134,376us-gaap_InterestExpense
Equity in income of non-consolidated affiliates									(14,553)us-gaap_IncomeLossFromEquityMethodInvestments	(19,000)us-gaap_IncomeLossFromEquityMethodInvestments	(51,483)us-gaap_IncomeLossFromEquityMethodInvestments
Other (income) expense, net									1,747us-gaap_OtherNonoperatingIncomeExpense	(24,501)us-gaap_OtherNonoperatingIncomeExpense	506us-gaap_OtherNonoperatingIncomeExpense
Provision for (benefit from) income taxes									58,657us-gaap_IncomeTaxExpenseBenefit	84,719us-gaap_IncomeTaxExpenseBenefit	(45,755)us-gaap_IncomeTaxExpenseBenefit
Income from discontinued operations, net of tax									(72,674)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(64,014)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(35,976)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Gross margin									$ 1,031,294exh_GrossMargin	$ 963,006exh_GrossMargin	$ 829,408exh_GrossMargin

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity, excluding depreciation and amortization expense. Gross margin is a non-GAAP financial measure.

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