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Income Taxes, Components of Deferred Income Tax (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets    
Current deferred tax assets $ 96,886us-gaap_DeferredTaxAssetsGrossCurrent $ 102,088us-gaap_DeferredTaxAssetsGrossCurrent
Net operating loss ("NOL") carryforwards 72,878us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 61,294us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Stock-based compensation 21,072us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 19,028us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Compensation and benefits - other 2,586us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther 3,746us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Deferred rent 18,513us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent 19,462us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent
Other 26,116us-gaap_DeferredTaxAssetsOther 24,604us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 238,051us-gaap_DeferredTaxAssetsGross 230,222us-gaap_DeferredTaxAssetsGross
Less valuation allowance (53,119)us-gaap_DeferredTaxAssetsValuationAllowance (43,375)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 184,932us-gaap_DeferredTaxAssetsNet 186,847us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities    
Property, plant and equipment 520,723us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 503,491us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Licenses/intangibles 275,456us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 282,764us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Partnership investments 149,371usm_DeferredTaxLiabilitiesInvestmentInAffiliates 133,931usm_DeferredTaxLiabilitiesInvestmentInAffiliates
Other 4,135us-gaap_DeferredTaxLiabilitiesOther 3,853us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 949,685us-gaap_DeferredIncomeTaxLiabilities 924,039us-gaap_DeferredIncomeTaxLiabilities
Net deferred income tax liability $ 764,753us-gaap_DeferredTaxLiabilities $ 737,192us-gaap_DeferredTaxLiabilities