Revenue Earning Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary of revenue earning equipment
Cost	$ 9,305,528	$ 9,269,518
Accumulated Depreciation	(3,496,545)	(3,514,910)
Net Book Value	5,808,983	5,754,608
Held for use: Full service lease [Member]
Summary of revenue earning equipment
Cost	6,783,263	6,728,746
Accumulated Depreciation	(2,463,080)	(2,500,786)
Net Book Value	4,320,183	4,227,960
Held for use: Commercial rental [Member]
Summary of revenue earning equipment
Cost	1,979,910	2,041,698
Accumulated Depreciation	(648,351)	(660,356)
Net Book Value	1,331,559	1,381,342
Held-for-sale [Member]
Summary of revenue earning equipment
Cost	542,355	499,074
Accumulated Depreciation	(385,114)	(353,768)
Net Book Value	$ 157,241	$ 145,306