Revenue Earning Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Revenue Earning Equipment [Line Items]
Cost	$ 10,887,843	$ 10,643,152
Accumulated Depreciation	(3,679,498)	(3,648,704)
Net Book Value	7,208,345	6,994,448
Held for use: Full service lease [Member]
Revenue Earning Equipment [Line Items]
Cost	8,042,352	7,918,497
Accumulated Depreciation	(2,614,711)	(2,591,688)
Net Book Value	5,427,641	5,326,809
Held for use: Commercial rental [Member]
Revenue Earning Equipment [Line Items]
Cost	2,513,888	2,411,957
Accumulated Depreciation	(830,133)	(830,683)
Net Book Value	1,683,755	1,581,274
Held-for-sale [Member]
Revenue Earning Equipment [Line Items]
Cost	331,603	312,698
Accumulated Depreciation	(234,654)	(226,333)
Net Book Value	96,949	86,365
Assets Held under Capital Leases [Member]
Revenue Earning Equipment [Line Items]
Cost	48,400	47,800
Accumulated Depreciation	$ (24,300)	$ (22,500)