Borrowings from Secured and Unsecured Debt Financings (Details Textual) (USD $)	1 Months Ended	12 Months Ended						1 Months Ended	12 Months Ended				12 Months Ended					12 Months Ended				1 Months Ended	12 Months Ended								12 Months Ended			1 Months Ended	12 Months Ended		12 Months Ended									1 Months Ended
	Oct. 31, 2011 Subsidiary	Dec. 31, 2012		Dec. 31, 2011 Term_Loan	Dec. 31, 2010	Dec. 31, 2012 Securitization Number One [Member]		Apr. 30, 2012 Senior Notes Due 2020	Dec. 31, 2012 Senior Notes Due 2020		Dec. 31, 2011 Senior Notes Due 2020	Apr. 04, 2012 Senior Notes Due 2020	Dec. 31, 2011 Senior Notes due 2018	Dec. 31, 2012 Senior Notes due 2018		Dec. 09, 2011 Senior Notes due 2018	Jun. 30, 2010 Senior Notes due 2018	Dec. 31, 2011 Senior Notes Due 2019	Dec. 31, 2012 Senior Notes Due 2019		Nov. 30, 2012 Senior Notes Due 2019	Apr. 30, 2012 Senior Notes due 2017	Dec. 31, 2012 Senior Notes due 2017		Dec. 31, 2011 Senior Notes due 2017	Apr. 04, 2012 Senior Notes due 2017	Dec. 31, 2012 Securitization Number Two [Member]		Dec. 31, 2012 Term Financing Number One [Member]		Dec. 31, 2012 Export Credit Agency [Member] Aircraft	Dec. 31, 2011 Export Credit Agency [Member] Aircraft	Dec. 31, 2010 Export Credit Agency [Member] Aircraft	Dec. 31, 2011 Bank Financings [Member] Subsidiary	Dec. 31, 2010 Bank Financings [Member] Aircraft	Oct. 31, 2011 Bank Financings [Member] Installment	Dec. 31, 2012 Compagnie Francaised Assurance Pour le Commerce Exterieur [Member] Term_Loan	Dec. 31, 2011 Compagnie Francaised Assurance Pour le Commerce Exterieur [Member] Term_Loan	Dec. 31, 2010 Compagnie Francaised Assurance Pour le Commerce Exterieur [Member] Term_Loan	Dec. 31, 2012 Senior Notes [Member] Senior Notes Due 2020	Dec. 31, 2012 Senior Notes [Member] Senior Notes due 2018	Dec. 31, 2012 Senior Notes [Member] Senior Notes Due 2019	Dec. 31, 2012 Senior Notes [Member] Senior Notes due 2017	Dec. 31, 2012 Term Financing [Member] Export Credit Agency [Member]	Dec. 31, 2012 Notes Payable to Banks [Member] Bank Financings [Member]	Dec. 31, 2011 Minimum Bank Financings [Member]	Dec. 31, 2011 Maximum Bank Financings [Member]	Dec. 19, 2012 Revolving Credit Facility [Member] 2012 Revolving Credit Facility [Member]	Dec. 31, 2012 One Month LIBOR [Member] Credit Agricole Corporate And Investment Bank [Member] Securitization Number One [Member]	Dec. 31, 2012 One Month LIBOR [Member] HSH Nordbank Ag [Member] Securitization Number Two [Member]
Debt Instrument [Line Items]
Redemption Price Percentage									101.00%														101.00%
Securitizations and Term Debt Financings (Textual) [Abstract]
Net proceeds of the private placement		$ 1,459,690,000		$ 669,047,000	$ 547,719,000			$ 300,000,000														$ 500,000,000
Interest rate on senior notes due												7.625%				9.75%	9.75%		6.25%							6.75%
Debt Instrument, Interest Rate, Effective Percentage						0.49%	[1]		7.625%	[1]				9.75%	[1]				6.25%	[1]			6.75%	[1]			0.54%	[1]	0.00%	[1]
Number Of Twelve Year Term Loans																																					2	5	2
Number Of Aircraft Related To Term Financing																															2	5	2		2
Loan Repayment Period																																														45 months	47 months
Debt Instrument, Face Amount																150,000,000	300,000,000				500,000,000										159,690,000	359,393,000	138,295,000	18,000,000		90,000,000
Debt, Weighted Average Interest Rate																																												3.221%	4.306%
Number Of Completed Term Financing				1
Number Of Installments																																				24
Line of Credit Facility, Maximum Borrowing Capacity																																				50,000,000												150,000,000
Long-term Debt, Gross		3,598,034,000	[2]																													61,571,000
Debt Instrument, Fee Amount																																																120,000
Minimum Net Worth Covenant For Credit Compliance					$ 500,000,000																														$ 500,000,000
Number Of Subsidiaries	1																																	2
Percentage of principal amount of loan redeemed Maximum											35.00%		35.00%					35.00%							35.00%
Debt Instrument, Redemption Payment Term, Percentage of Principal Amount																																								107.625%	109.75%	106.25%	106.75%
Extinguishment Of Debt As Percentage Of Principal Amount Including Accrued And Unpaid Interest													101.00%					101.00%
Debt Instrument, Basis Spread on Variable Rate																																																	1.00%	7.50%

[1] Reflects the floating rate in effect at the applicable reset date plus the margin for Securitization No. 1, Securitization No. 2 and one of our ECA Term Financings. All other financings have a fixed rate.

[2] Included in the above table are forecasted principal payments for Securitizations No. 1 and No. 2. These forecasted payments are based on excess cash flows available from forecasted lease rentals, net maintenance funding (which is forecasted to be neutral after the first 12 months) and proceeds from asset dispositions after the payment of forecasted operating expenses and interest payments.