Derivatives (Narrative) (Details)			12 Months Ended									12 Months Ended
	Dec. 31, 2013 Prepaid Expenses And Other Assets [Member] USD ($)	Dec. 31, 2012 Prepaid Expenses And Other Assets [Member] USD ($)	Dec. 31, 2013 Swap [Member] USD ($) gal	Dec. 31, 2012 Swap [Member] USD ($) gal	Dec. 31, 2011 Swap [Member] USD ($) gal	Dec. 31, 2013 Swap [Member] Prepaid Expenses And Other Assets [Member] USD ($)	Dec. 31, 2012 Swap [Member] Prepaid Expenses And Other Assets [Member] USD ($)	Dec. 31, 2013 Swap [Member] Accrued Expenses And Other Liabilities [Member] USD ($)	Dec. 31, 2012 Swap [Member] Accrued Expenses And Other Liabilities [Member] USD ($)	Dec. 31, 2013 Swap [Member] Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Dec. 31, 2012 Swap [Member] Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Dec. 31, 2013 Foreign Exchange Forward [Member] CAD	Dec. 31, 2011 Foreign Exchange Forward [Member] USD ($)	Dec. 31, 2013 Maximum [Member] Swap [Member] USD ($)	Dec. 31, 2012 Maximum [Member] Swap [Member] USD ($)	Dec. 31, 2011 Maximum [Member] Swap [Member] USD ($)	Dec. 31, 2013 Cost of equipment rentals, excluding depreciation [Member] Designated as Hedging Instrument [Member] Swap [Member] USD ($)		Dec. 31, 2012 Cost of equipment rentals, excluding depreciation [Member] Designated as Hedging Instrument [Member] Swap [Member] USD ($)		Dec. 31, 2011 Cost of equipment rentals, excluding depreciation [Member] Designated as Hedging Instrument [Member] Swap [Member] USD ($)
Derivative [Line Items]
Derivative, nonmonetary notional amount (in gallons)			6,900,000
Derivative purchases of underlying currency (in Canadian Dollars)												421,000,000
Derivative asset (Less than $1 as of December 31, 2013 and December 31, 2012)	1,000,000	1,000,000				1,000,000	1,000,000
Derivative liability (Less than $1 as of December 31, 2013 and December 31, 2012)								1,000,000	1,000,000
Derivative accumulated other comprehensive income (Less than $1 as of December 31, 2013 and December 31, 2012)										1,000,000	1,000,000
Hedging activities net cash flow impact			(38,000,000)	25,000,000	22,000,000									1,000,000	1,000,000	1,000,000
Gain (loss) on hedged item													(4,000,000)				(38,000,000)	[1],[2]	(25,000,000)	[1],[2]	(23,000,000)	[1],[2]
Derivative purchases of underlying commodity (in gallons)			9,700,000	6,300,000	5,900,000
Amount of income (expense) recognized on derivative													$ 4,000,000								$ 2,000,000	[1],[2]

[1] Amounts recognized on derivative represent the effective portion of the fixed price diesel swaps.

[2] Amounts recognized on hedged item reflect the use of 9.7 million, 6.3 million and 5.9 million gallons of diesel covered by the fixed price swaps during the years ended December 31, 2013, 2012 and 2011, respectively.