Revenue Earning Equipment - Schedule of Revenue Earning Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue Earning Equipment [Line Items]
Cost	$ 11,665,734		$ 10,890,902
Accumulated Depreciation	(3,811,697)		(3,689,016)
Net Book Value	7,854,037	$ 7,409,529	7,201,886	$ 6,592,826
Held for use: Full service lease [Member]
Revenue Earning Equipment [Line Items]
Cost	8,398,012		8,008,122
Accumulated Depreciation	(2,677,023)		(2,598,140)
Net Book Value	5,720,989		5,409,982
Held for use: Commercial rental [Member]
Revenue Earning Equipment [Line Items]
Cost	2,925,063		2,570,081
Accumulated Depreciation	(898,319)		(864,543)
Net Book Value	2,026,744		1,705,538
Held-for-sale [Member]
Revenue Earning Equipment [Line Items]
Cost	342,659		312,699
Accumulated Depreciation	(236,355)		(226,333)
Net Book Value	106,304		86,366
Assets Held under Capital Leases [Member]
Revenue Earning Equipment [Line Items]
Cost	48,000		47,800
Accumulated Depreciation	$ (20,300)		$ (22,500)