Depreciation of Revenue Earning Equipment and Lease Charges (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	$ 39.4	$ 6.2
Net decrease in depreciation expenses	0.2
Equipment Rental
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	4.5	0.1
Car Rental
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	$ 34.9	$ 6.1
Number of non-program cars sold	40,000	30,600
Year over year increase in sale of non-program cars (as a percent)	30.60%

Represents the net increase (decrease) in depreciation expenses primarily due to the revision of depreciation rates on a quarterly basis, based on management's routine review of the present and estimated future market conditions and their effect on residual values at the time of disposal.

No definition available.

+ Details

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Namespace Prefix:	htz_
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Balance Type:	debit
Period Type:	duration

- Definition

The number of non-program cars sold by the entity during the period.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Represents the year over year percentage of increase (decrease) in the sale of non-program cars.

+ References

No definition available.

+ Details

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Namespace Prefix:	htz_
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- Definition

The net gain (loss) arising from the lessor's sale of assets held- or available-for-lease under contractual arrangements classified as operating leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 20, 21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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