Equipment Held for Lease (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 region	Dec. 31, 2012	Dec. 31, 2011
Equipment Held for Lease
Number of geographic regions in which aircraft lessees are domiciled in	8
Lease rent revenue	$ 101,737,000	$ 94,591,000	$ 104,663,000
Lease rent revenue less applicable depreciation and interest	10,679,000	21,845,000	33,643,000
Net book value of equipment held for operating lease	1,033,022,000	961,459,000	981,505,000
Minimum future payments under non-cancelable leases
2014	68,226,000
2015	42,956,000
2016	30,037,000
2017	20,878,000
2018	15,479,000
Thereafter	26,663,000
Minimum future payments	204,239,000
United States
Equipment Held for Lease
Lease rent revenue	14,258,000	11,693,000	20,790,000
Lease rent revenue less applicable depreciation and interest	6,055,000	5,875,000	9,663,000
Net book value of equipment held for operating lease	103,515,000	68,845,000	128,989,000
Mexico
Equipment Held for Lease
Lease rent revenue	7,387,000	6,075,000	6,806,000
Lease rent revenue less applicable depreciation and interest	1,641,000	2,472,000	3,609,000
Net book value of equipment held for operating lease	75,628,000	59,694,000	66,317,000
Canada
Equipment Held for Lease
Lease rent revenue	2,947,000	5,206,000	3,183,000
Lease rent revenue less applicable depreciation and interest	747,000	3,015,000	1,731,000
Net book value of equipment held for operating lease	12,500,000	17,658,000	30,987,000
Europe
Equipment Held for Lease
Lease rent revenue	37,788,000	35,001,000	38,626,000
Lease rent revenue less applicable depreciation and interest	5,061,000	11,162,000	13,844,000
Net book value of equipment held for operating lease	368,381,000	299,505,000	305,154,000
South America
Equipment Held for Lease
Lease rent revenue	8,794,000	9,196,000	9,818,000
Lease rent revenue less applicable depreciation and interest	2,995,000	4,482,000	5,266,000
Net book value of equipment held for operating lease	78,486,000	87,660,000	86,301,000
Asia
Equipment Held for Lease
Lease rent revenue	21,407,000	18,585,000	18,635,000
Lease rent revenue less applicable depreciation and interest	5,652,000	6,212,000	7,162,000
Net book value of equipment held for operating lease	219,123,000	229,946,000	159,022,000
Africa
Equipment Held for Lease
Lease rent revenue	2,609,000	2,307,000	2,084,000
Lease rent revenue less applicable depreciation and interest	837,000	746,000	1,180,000
Net book value of equipment held for operating lease	3,734,000	5,280,000	11,844,000
Middle East
Equipment Held for Lease
Lease rent revenue	6,547,000	6,528,000	4,721,000
Lease rent revenue less applicable depreciation and interest	1,664,000	3,011,000	1,727,000
Net book value of equipment held for operating lease	58,509,000	74,644,000	49,208,000
Off-lease and other
Equipment Held for Lease
Lease rent revenue less applicable depreciation and interest	(13,973,000)	(15,130,000)	(10,539,000)
Net book value of equipment held for operating lease	113,146,000	118,227,000	143,683,000
Equipment held for lease | Aircraft engines and related equipment
Equipment Held for Lease
Number of equipments held for lease	202	184
Cost of equipments held for lease	1,259,600,000	1,156,700,000
Equipment held for lease | Spare parts packages
Equipment Held for Lease
Number of equipments held for lease	5	4
Cost of equipments held for lease	6,100,000	5,900,000
Equipment held for lease | Aircrafts
Equipment Held for Lease
Number of equipments held for lease	4	7
Cost of equipments held for lease	23,500,000	37,200,000
Month-to-month leases
Equipment Held for Lease
Net book value of equipment held for operating lease	102,721,000	149,585,000
Leases expiring 2013
Equipment Held for Lease
Net book value of equipment held for operating lease		339,598,000
Leases expiring 2014
Equipment Held for Lease
Net book value of equipment held for operating lease	370,370,000	76,485,000
Leases expiring 2015
Equipment Held for Lease
Net book value of equipment held for operating lease	124,130,000	43,243,000
Leases expiring 2016
Equipment Held for Lease
Net book value of equipment held for operating lease	100,622,000	79,600,000
Leases expiring 2017
Equipment Held for Lease
Net book value of equipment held for operating lease	63,969,000	58,583,000
Leases expiring 2018
Equipment Held for Lease
Net book value of equipment held for operating lease	47,604,000
Leases expiring thereafter
Equipment Held for Lease
Net book value of equipment held for operating lease	$ 110,460,000	$ 96,138,000