Revenue Earning Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Y	Dec. 31, 2011
Summary of revenue earning equipment
Cost	$ 9,269,518	$ 8,512,030
Accumulated depreciation on revenue earning equipment	(3,514,910)	(3,462,359)
Net Book Value	5,754,608	5,049,671
Held for use: Full service lease [Member]
Summary of revenue earning equipment
Estimated Useful Life, Minimum	3
Estimated Useful Life, Maximum	12
Cost	6,728,746	6,010,335
Accumulated depreciation on revenue earning equipment	(2,500,786)	(2,518,830)
Net Book Value	4,227,960	3,491,505
Held for use: Commercial rental [Member]
Summary of revenue earning equipment
Estimated Useful Life, Minimum	4.5
Estimated Useful Life, Maximum	12
Cost	2,041,698	2,175,003
Accumulated depreciation on revenue earning equipment	(660,356)	(708,052)
Net Book Value	1,381,342	1,466,951
Held-for-sale [Member]
Summary of revenue earning equipment
Cost	499,074	326,692
Accumulated depreciation on revenue earning equipment	(353,768)	(235,477)
Net Book Value	$ 145,306	$ 91,215