Revenue Earning Equipment (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Summary of revenue earning equipment
Cost	$ 10,459,913		$ 10,086,939
Accumulated Depreciation	(3,606,535)		(3,596,102)
Net Book Value	6,853,378	[1]	6,490,837	[1]
Held for use: Full service lease [Member]
Summary of revenue earning equipment
Cost	7,692,678		7,436,093
Accumulated Depreciation	(2,558,920)		(2,537,077)
Net Book Value	5,133,758	[1]	4,899,016	[1]
Held for use: Commercial rental [Member]
Summary of revenue earning equipment
Cost	2,447,933		2,210,863
Accumulated Depreciation	(815,266)		(747,283)
Net Book Value	1,632,667	[1]	1,463,580	[1]
Held-for-sale [Member]
Summary of revenue earning equipment
Cost	319,302		439,983
Accumulated Depreciation	(232,349)		(311,742)
Net Book Value	86,953	[1]	128,241	[1]
Assets Held under Capital Leases [Member]
Summary of revenue earning equipment
Cost	47,900		54,200
Accumulated Depreciation	$ (21,300)		$ (22,000)

[1] Revenue earning equipment, net includes vehicles acquired under capital leases of $47.9 million, less accumulated depreciation of $21.3 million, at September 30, 2014, and $54.2 million, less accumulated depreciation of $22.0 million, at December 31, 2013.