Revenue Earning Equipment (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summary of revenue earning equipment
Cost	$ 9,168,871	$ 8,512,030
Accumulated Depreciation	(3,499,462)	(3,462,359)
Net Book Value	5,669,409	5,049,671
Held for use: Full service lease [Member]
Summary of revenue earning equipment
Cost	6,585,343	6,010,335
Accumulated Depreciation	(2,504,588)	(2,518,830)
Net Book Value	4,080,755	3,491,505
Held for use: Commercial rental [Member]
Summary of revenue earning equipment
Cost	2,079,397	2,175,003
Accumulated Depreciation	(641,735)	(708,052)
Net Book Value	1,437,662	1,466,951
Held-for-sale [Member]
Summary of revenue earning equipment
Cost	504,131	326,692
Accumulated Depreciation	(353,139)	(235,477)
Net Book Value	$ 150,992	$ 91,215