Borrowings from Secured and Unsecured Debt Financings (Details Textual) (USD $)	12 Months Ended				1 Months Ended	3 Months Ended	12 Months Ended					1 Months Ended	12 Months Ended					1 Months Ended		1 Months Ended		12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended			3 Months Ended	1 Months Ended		1 Months Ended					1 Months Ended						12 Months Ended							12 Months Ended					1 Months Ended	12 Months Ended	1 Months Ended			1 Months Ended					12 Months Ended						12 Months Ended			0 Months Ended		0 Months Ended
	Dec. 31, 2013 Aircraft	Dec. 31, 2012 Aircraft	Dec. 31, 2011	Dec. 31, 2013 ECA Term Financings Notes Payable, Other Payables	Jun. 30, 2013 ECA Term Financings Notes Payable, Other Payables A-330-200 Term_Loan	Jun. 30, 2013 ECA Term Financings Notes Payable, Other Payables A-330-200	Dec. 31, 2012 ECA Term Financings Notes Payable, Other Payables A-330-200 Term_Loan	Dec. 31, 2011 ECA Term Financings Notes Payable, Other Payables A-330-200 Term_Loan	Dec. 31, 2010 ECA Term Financings Notes Payable, Other Payables A-330-200 Term_Loan	Dec. 31, 2013 ECA Term Financings Notes Payable, Other Payables A-330-200	Aug. 31, 2013 ECA Term Financings Notes Payable, Other Payables A-330-200 Subsidiary	Aug. 31, 2013 ECA Term Financings Notes Payable, Other Payables A-330-200 Aircraft	Dec. 31, 2012 ECA Term Financings Notes Payable, Other Payables A-330-200 Aircraft	Dec. 31, 2011 ECA Term Financings Notes Payable, Other Payables A-330-200 Aircraft	Dec. 31, 2010 ECA Term Financings Notes Payable, Other Payables A-330-200 Aircraft	Dec. 31, 2013 Bank Financings Notes Payable to Banks	Oct. 31, 2011 Bank Financings, October 2011 Notes Payable to Banks B-777-300ER Subsidiary Installment	Oct. 31, 2011 Bank Financings, October 2011 Notes Payable to Banks B-777-300ER Aircraft	Dec. 31, 2011 Bank Financings, December 2011 Notes Payable to Banks McDonnell Douglas MD-11F Freighter Aircraft Subsidiary	Dec. 31, 2011 Bank Financings, December 2011 Notes Payable to Banks McDonnell Douglas MD-11F Freighter Aircraft Minimum	Dec. 31, 2011 Bank Financings, December 2011 Notes Payable to Banks McDonnell Douglas MD-11F Freighter Aircraft Maximum	Dec. 31, 2011 Bank Financings, December 2011 Notes Payable to Banks McDonnell Douglas MD-11F Freighter Aircraft Aircraft	May 31, 2013 Bank Financings, May 2013 Notes Payable to Banks A-320-200 & B-737-800	Dec. 31, 2013 Bank Financings, May 2013 Notes Payable to Banks A-320-200 & B-737-800 loan	May 31, 2013 Bank Financings, May 2013 Notes Payable to Banks A-320-200 Aircraft	May 31, 2013 Bank Financings, May 2013 Notes Payable to Banks B-737-800 Aircraft	May 31, 2013 Bank Financings, May 2013, Floating Rate Loans Notes Payable to Banks A-320-200 & B-737-800 variable_loan	Dec. 31, 2013 Bank Financings, May 2013, Floating Rate Loans Notes Payable to Banks A-320-200 & B-737-800 variable_loan	May 31, 2013 Bank Financings, May 2013, Fixed Rate Loans Notes Payable to Banks A-320-200 & B-737-800 fixed_loan	Dec. 31, 2013 Bank Financings, May 2013, Fixed Rate Loans Notes Payable to Banks A-320-200 & B-737-800	Dec. 31, 2013 Bank Financings, December 2013 Notes Payable to Banks B-777-300ER Subsidiary	Dec. 31, 2013 Bank Financings, December 2013 Notes Payable to Banks B-777-300ER Aircraft	Feb. 28, 2014 Bank Financings, December 2013 Notes Payable to Banks B-777-300ER Subsequent Event Aircraft	Dec. 31, 2013 Bank Financings, February 2014 Notes Payable to Banks B-777-300 & A-330-200 Aircraft	Feb. 28, 2014 Bank Financings, February 2014 Notes Payable to Banks B-777-300 & A-330-200 Subsequent Event	Feb. 28, 2014 Bank Financings, February 2014 Notes Payable to Banks A-320-200 Subsequent Event Aircraft	Feb. 28, 2014 Bank Financings, February 2014, Floating Rate Loans Notes Payable to Banks B-777-300 & A-330-200 Subsequent Event variable_loan	Feb. 28, 2014 Bank Financings, February 2014, Fixed Rate Loans Notes Payable to Banks B-777-300 & A-330-200 Subsequent Event fixed_loan	Dec. 31, 2013 Senior Notes due 2017 Senior Notes		Dec. 31, 2012 Senior Notes due 2017 Senior Notes	Dec. 31, 2012 Senior Notes due 2017 Senior Notes Maximum	Dec. 31, 2012 Senior Notes due 2017 Senior Notes Company Redemption Option	Dec. 31, 2012 Senior Notes due 2017 Senior Notes Change in Control	Dec. 31, 2013 Senior Notes due 2018 with 9.75% Interest Rate Senior Notes		Dec. 31, 2011 Senior Notes due 2018 with 9.75% Interest Rate Senior Notes	Dec. 31, 2010 Senior Notes due 2018 with 9.75% Interest Rate Senior Notes	Dec. 31, 2012 Senior Notes due 2018 with 9.75% Interest Rate Senior Notes Maximum	Dec. 31, 2013 Senior Notes due 2018 with 9.75% Interest Rate Senior Notes Company Redemption Option	Dec. 31, 2012 Senior Notes due 2018 with 9.75% Interest Rate Senior Notes Change in Control	Dec. 31, 2013 Senior Notes due 2018 with 4.625% Interest Rate Senior Notes		Dec. 31, 2013 Senior Notes due 2018 with 4.625% Interest Rate Senior Notes Maximum	Dec. 31, 2013 Senior Notes due 2018 with 4.625% Interest Rate Senior Notes Company Redemption Option	Dec. 31, 2013 Senior Notes due 2018 with 4.625% Interest Rate Senior Notes Change in Control	Dec. 31, 2013 Securitization No. 1 Secured Debt		Feb. 28, 2014 Securitization No. 1 Secured Debt Subsequent Event	Dec. 31, 2013 Securitization No. 1 Secured Debt Subsequent Event	Dec. 31, 2013 Senior Notes due 2019 Senior Notes		Dec. 31, 2012 Senior Notes due 2019 Senior Notes	Dec. 31, 2012 Senior Notes due 2019 Senior Notes Maximum	Dec. 31, 2012 Senior Notes due 2019 Senior Notes Company Redemption Option	Dec. 31, 2012 Senior Notes due 2019 Senior Notes Change in Control	Dec. 31, 2013 Senior Notes due 2020 Senior Notes		Dec. 31, 2012 Senior Notes due 2020 Senior Notes	Dec. 31, 2012 Senior Notes due 2020 Senior Notes Maximum	Dec. 31, 2012 Senior Notes due 2020 Senior Notes Company Redemption Option	Dec. 31, 2012 Senior Notes due 2020 Senior Notes Change in Control	Dec. 19, 2012 2012 Revolving Credit Facility Line of Credit Revolving Credit Facility	Aug. 02, 2013 2012 Revolving Credit Facility Line of Credit Revolving Credit Facility	Aug. 02, 2013 2013 Revolving Credit Facility Line of Credit Revolving Credit Facility
Debt Instrument [Line Items]
Number of debt instruments							2	5	2															4			3	2	1								2	1
Debt instrument, term							12 years	12 years	12 years											45 months	47 months										95 months																																										3 years		3 years
Number of aircraft acquired												1	2	5	2			1				2			2	2						1	2			1
Debt Instrument, Face Amount							$ 159,690,000	$ 359,393,000	$ 138,295,000		$ 78,230,000						$ 90,000,000		$ 18,000,000												$ 85,000,000				$ 303,200,000						$ 500,000,000						$ 150,000,000	$ 300,000,000				$ 400,000,000											$ 500,000,000						$ 300,000,000
Debt Instrument, Number of Instruments Repaid					2			1
Repayments of Long-term Debt	510,162,000	847,415,000	390,945,000		111,693,000			61,571,000																																																			255,186,000
Loan Termination Fee					2,954,000
Write off of Deferred Debt Issuance Cost						3,825,000																																																																			120,000
Number of Subsidiaries											1						1		2												1
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid																	50,000,000														18,845,000
Number of Aircraft	162	159																																3
Net Book Value	5,044,410,000	4,662,661,000																																411,057,000																										410,501,000
Debt Instrument, Interest Rate, Stated Percentage											3.488%																			2.58%									6.75%	[1]	6.75%				9.75%	[1]	9.75%	9.75%				4.625%	[1]				0.44%	[1]			6.25%	[1]	6.25%				7.625%	[1]	7.625%
Debt, Weighted Average Interest Rate										3.569%						3.81%								2.36%
Debt Instrument, Minimum Net Worth Covenant Required				500,000,000												500,000,000
Term debt financings assumed in asset acquisitions	84,721,000	0	0																				91,797,000
Number Of Installments																	24
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed																																										35.00%							35.00%					35.00%										35.00%						35.00%
Debt Instrument, Redemption Price, Percentage																																											106.75%	101.00%						109.75%	101.00%				104.625%	101.00%									106.25%	101.00%					107.625%	101.00%
Line of Credit Facility, Current Borrowing Capacity																																																																									150,000,000	150,000	335,000,000
Line of Credit Facility, Maximum Borrowing Capacity																																																																											$ 400,000,000

[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.