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Debt (Long Term Debt Narrative) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
Jun. 30, 2008
Oct. 31, 2010
Oct. 31, 2012
Mar. 31, 2014
Mar. 30, 2012
Jan. 31, 2011
Nov. 30, 2009
Dec. 31, 2012
Jan. 21, 2015
Dec. 31, 2018
Dec. 31, 2015
Dec. 31, 2020
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2013
Mar. 31, 2012
$2.3 billion ABL Facility                                    
Debt Instrument [Line Items]                                    
Maximum revolving credit amount percentage 10.00%uri_DebtInstrumentCovenantTermsMaximumRevolvingCreditAmountPercentage
/ us-gaap_DebtInstrumentAxis
= uri_AblFacilityMember
                                 
Debt terms reference amount to maximum revolving credit $ 150,000,000uri_DebtInstrumentCovenantTermsMaximumRevolvingAmount
/ us-gaap_DebtInstrumentAxis
= uri_AblFacilityMember
                                 
8 3/8 percent Senior Subordinated Notes                                    
Debt Instrument [Line Items]                                    
Stated interest rate 8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorSubordinatedNotes8.375PercentMember
                                 
6 1/8 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount       400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes6.125PercentMember
                           
Stated interest rate 6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes6.125PercentMember
                                 
5 3/4 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Stated interest rate 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes5.75PercentMember
                                 
4 percent Convertible Senior Notes                                    
Debt Instrument [Line Items]                                    
Stated interest rate 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
              4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
              4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
 
Effective interest rate 7.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
                                 
Debt instrument, convertible, conversion price $ 11.11us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
                                 
8 1/4 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Stated interest rate 8.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes8.25PercentMember
                                 
5 3/4 percent Senior Secured Notes                                    
Debt Instrument [Line Items]                                    
Stated interest rate 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorSecuredNotes5.75PercentMember
                                 
7 3/8 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Stated interest rate 7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes7.375PercentMember
                                 
7 5/8 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Stated interest rate 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes7.625PercentMember
                                 
Subsidiaries | $2.3 billion ABL Facility                                    
Debt Instrument [Line Items]                                    
Line of credit facility, maximum borrowing capacity 2,300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= uri_AblFacilityMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
                                 
Credit facility | Line of credit | $2.3 billion ABL Facility                                    
Debt Instrument [Line Items]                                    
Debt instrument, term   5 years                                
Line of credit facility, maximum borrowing capacity   1,250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= uri_AblFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
                            2,300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= uri_AblFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
 
Line of credit facility, average outstanding amount 1,100,000,000us-gaap_LineOfCreditFacilityAverageOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= uri_AblFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
                                 
Line of credit facility, interest rate during period 2.30%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= uri_AblFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
                                 
Line of credit facility, maximum month-end outstanding amount 1,300,000,000us-gaap_LineOfCreditFacilityMaximumMonthendOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= uri_AblFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
                                 
Senior subordinated notes | 8 3/8 percent Senior Subordinated Notes                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount     750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= uri_SeniorSubordinatedNotes8.375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
                             
Proceeds from issuance of long-term debt     732,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= uri_SeniorSubordinatedNotes8.375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
                             
Debt Instrument, Redemption Price, Percentage     101.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorSubordinatedNotes8.375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
                             
Senior notes | 6 1/8 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount 925,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes6.125PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                                 
Proceeds from issuance of long-term debt       939,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes6.125PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                           
Debt Instrument, Redemption Price, Percentage       101.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes6.125PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                           
Effective interest rate 5.70%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes6.125PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                                 
Senior notes | Add-on to Senior Notes 6 1/8 percent                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount         525,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= uri_AddontoSeniorNotes6.125PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                         
Debt instrument, unamortized premium 26,000,000us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_DebtInstrumentAxis
= uri_AddontoSeniorNotes6.125PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                                 
Senior notes | 5 3/4 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount         850,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes5.75PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                         
Proceeds from issuance of long-term debt         837,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes5.75PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                         
Debt Instrument, Redemption Price, Percentage         101.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes5.75PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                         
Senior notes | 7 3/8 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount                                   750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes7.375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Proceeds from issuance of long-term debt           732,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes7.375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                       
Debt Instrument, Redemption Price, Percentage           101.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes7.375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                       
Senior notes | 7 5/8 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount                                   1,325,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes7.625PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Proceeds from issuance of long-term debt           1,295,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes7.625PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                       
Debt Instrument, Redemption Price, Percentage           101.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes7.625PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                       
Senior notes | RSC Holdings Inc | 8 1/4 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount             650,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= uri_RscHoldingsIncMember
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes8.25PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                     
Debt Instrument, Redemption Price, Percentage             101.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_BusinessAcquisitionAxis
= uri_RscHoldingsIncMember
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes8.25PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                     
Effective interest rate 7.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_BusinessAcquisitionAxis
= uri_RscHoldingsIncMember
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes8.25PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                                 
Debt instrument, unamortized discount 37,000,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_BusinessAcquisitionAxis
= uri_RscHoldingsIncMember
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes8.25PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                                 
Senior secured notes | 5 3/4 percent Senior Secured Notes                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount                                   750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= uri_SeniorSecuredNotes5.75PercentMember
/ us-gaap_LongtermDebtTypeAxis
= uri_SeniorSecuredNotesMember
Proceeds from issuance of long-term debt           733,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= uri_SeniorSecuredNotes5.75PercentMember
/ us-gaap_LongtermDebtTypeAxis
= uri_SeniorSecuredNotesMember
                       
Debt Instrument, Redemption Price, Percentage           101.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorSecuredNotes5.75PercentMember
/ us-gaap_LongtermDebtTypeAxis
= uri_SeniorSecuredNotesMember
                       
12-month period commencing on May 15, 2019 | Senior notes | 5 3/4 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt Instrument, Redemption Price, Percentage         102.875%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes5.75PercentMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                         
12-month period commencing on May 15, 2022 | Senior notes | 5 3/4 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt Instrument, Redemption Price, Percentage         100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes5.75PercentMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                         
Convertible debt                                    
Debt Instrument [Line Items]                                    
Debt instrument convertible, shares issued 3uri_DebtInstrumentConvertibleIfconvertedSharesIssued
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Debt instrument effective conversion price $ 15.56uri_DerivativeEffectiveConversionPriceofConvertibleNotes
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Convertible debt | 4 percent Convertible Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount 34,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
            173,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                   
Stated interest rate 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
            4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
              4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Proceeds from issuance of long-term debt               167,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                   
Debt Instrument, Redemption Price, Percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Effective interest rate 11.60%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Debt instrument, convertible, conversion price $ 11.11us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Debt Instrument, Convertible, Value if Converted 310,000,000uri_DebtInstrumentConvertibleValueifConverted
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Derivative cost of hedge               26,000,000us-gaap_DerivativeCostOfHedge
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                   
Debt instrument convertible if converted price per share $ 102.01uri_DebtInstrumentConvertibleIfconvertedPricePerShare
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Debt instrument convertible if converted value, non-cash 276,000,000uri_DebtInstrumentConvertibleIfconvertedNoncashValue
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Cost to convert convertible notes 3,000,000uri_DebtInstrumentConvertibleIfconvertedCosts
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Change in stock price to settle convertible debt per share $ 1uri_DebtInstrumentConvertibleIfconvertedChangeinStockPricetoSettlePerShare
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Debt conversion, hedged converted instrument, cash and non-cash receivable 3,000,000uri_DebtInstrumentConvertibleIfconvertedAmountReceived
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Debt instrument convertible, hedged, if converted price per share $ 12.10uri_DebtInstrumentConvertibleEffectiveConversionPriceFollowingConversion
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Debt instrument, unamortized discount 2,000,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Convertible note hedge transactions, net               17,000,000uri_DerivativeConvertibleIncreaseDecreaseinAdditionalPaidinCapital
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
33,000,000uri_DerivativeConvertibleIncreaseDecreaseinAdditionalPaidinCapital
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                 
Proceeds from convertible debt 173,000,000us-gaap_ProceedsFromConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Convertible note hedge transaction shares 0.7uri_ConvertibleNoteHedgeTransactionShares
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Shares to be issued, hypothetical share price one 2.6uri_DebtInstrumentConvertibleNumberofEquityInstrumentsHypotheticalSharePriceOne
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Shares to be issued, hypothetical share price two 2.7uri_DebtInstrumentConvertibleNumberofEquityInstrumentsHypotheticalSharePriceTwo
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Percentage premium over price at issuance 75.00%uri_DerivativeEffectiveConversionPriceofConvertibleNotesPremiumOverClosingPriceofStockatIssuancePercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Closing price at issuance $ 8.89us-gaap_SharePrice
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Debt conversion, hypothetical market price per share one $ 80.00uri_DebtConversionHypotheticalSharePriceOnePerShare
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Debt conversion, hypothetical market price per share two $ 100.00uri_DebtConversionHypotheticalSharePriceTwoPerShare
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                                 
Convertible debt | Subsequent event | 4 percent Convertible Senior Notes                                    
Debt Instrument [Line Items]                                    
Redemption notice amount                   $ 26,000,000uri_DebtInstrumentConvertibleRedemptionNoticeAmount
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
               
Forecast | Senior subordinated notes | 8 3/8 percent Senior Subordinated Notes                                    
Debt Instrument [Line Items]                                    
Debt Instrument, Redemption Price, Percentage                     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorSubordinatedNotes8.375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
104.188%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorSubordinatedNotes8.375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
           
Forecast | Senior notes | 6 1/8 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt Instrument, Redemption Price, Percentage                         100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes6.125PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
103.063%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes6.125PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
       
Forecast | Senior notes | 7 3/8 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt Instrument, Redemption Price, Percentage                     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes7.375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
      103.688%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes7.375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
     
Forecast | Senior notes | 7 5/8 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt Instrument, Redemption Price, Percentage                         100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes7.625PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
103.813%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes7.625PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
       
Forecast | Senior notes | RSC Holdings Inc | 8 1/4 percent Senior Notes                                    
Debt Instrument [Line Items]                                    
Debt Instrument, Redemption Price, Percentage                             104.125%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_BusinessAcquisitionAxis
= uri_RscHoldingsIncMember
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes8.25PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_BusinessAcquisitionAxis
= uri_RscHoldingsIncMember
/ us-gaap_DebtInstrumentAxis
= uri_SeniorNotes8.25PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
   
Forecast | Senior secured notes | 5 3/4 percent Senior Secured Notes                                    
Debt Instrument [Line Items]                                    
Debt Instrument, Redemption Price, Percentage                       102.875%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorSecuredNotes5.75PercentMember
/ us-gaap_LongtermDebtTypeAxis
= uri_SeniorSecuredNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
  100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= uri_SeniorSecuredNotes5.75PercentMember
/ us-gaap_LongtermDebtTypeAxis
= uri_SeniorSecuredNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember