Long Term Debt (Details) (USD $)	0 Months Ended	9 Months Ended			0 Months Ended		9 Months Ended					0 Months Ended	9 Months Ended		9 Months Ended		0 Months Ended	9 Months Ended		9 Months Ended			0 Months Ended		9 Months Ended			0 Months Ended
	Jul. 16, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 18, 2013 WOLF A340 LLC [Member]	Sep. 17, 2012 Class 2012 A Term Notes [Member] Willis Engine Securitization Trust II [Member]	Sep. 30, 2014 Class 2012 A Term Notes [Member] Willis Engine Securitization Trust II [Member] engine	Dec. 31, 2013 Class 2012 A Term Notes [Member] Willis Engine Securitization Trust II [Member]	Sep. 30, 2014 Class 2012 A Term Notes [Member] Willis Engine Securitization Trust II [Member] Minimum [Member]	Sep. 17, 2012 WEST Notes [Member]	Sep. 30, 2014 Secured Debt 2.83 Percent Ten Year Member	Sep. 28, 2012 Secured Debt 5.50 Percent Five Year [Member]	Sep. 30, 2014 Secured Debt 5.50 Percent Five Year [Member] engine	Dec. 31, 2013 Secured Debt 5.50 Percent Five Year [Member]	Sep. 30, 2014 Term Notes [Member] WOLF A340 LLC [Member]	Sep. 18, 2013 Term Notes [Member] WOLF A340 LLC [Member] item	Jan. 10, 2014 Secured Debt 2.25 Percent Four Year [Member]	Sep. 30, 2014 Secured Debt 2.25 Percent Four Year [Member] engine	Dec. 31, 2013 Secured Debt 2.25 Percent Four Year [Member]	Sep. 30, 2014 Notes Payable, Other Payables [Member]	Sep. 30, 2014 Notes Payable, Other Payables [Member] Minimum [Member]	Sep. 30, 2014 Notes Payable, Other Payables [Member] Maximum [Member]	Jun. 05, 2014 Revolving Credit Facility [Member]	Jun. 05, 2014 Revolving Credit Facility [Member]	Sep. 30, 2014 Revolving Credit Facility [Member]	Jun. 30, 2014 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Sep. 17, 2012 Revolving Credit Facility [Member] Willis Engine Securitization Trust [Member] engine
Long Term Debt
Maturity term	10 years						10 years					5 years					4 years				2 years 8 months 12 days	8 years
Interest rate, minimum (as a percent)																				2.40%
Interest rate, maximum (as a percent)																				5.50%
Maximum borrowing capacity under credit facility																								$ 700,000,000
Remaining borrowing capacity available																									357,000,000		88,000,000
Debt issuance costs																								4,900,000
Maximum borrowing capacity under credit facility before amendment																								450,000,000
Variable rate of debt		one-month LIBOR													one-month LIBOR			one-month LIBOR							one-month LIBOR
Basis spread on variable rate (as a percent)															4.00%			2.25%							2.50%
Net proceeds received from notes issued and sold		34,395,000	72,000,000			384,900,000
Total notes payable		761,230,000		787,614,000			356,900,000	370,600,000		435,900,000	13,200,000		7,800,000	8,200,000	25,600,000			14,800,000	15,800,000
Number of engines pledged as collateral							71						1					3										22
Fixed amortization of notes payable							0
Number of business days to pay interest							5 days
Fixed rate (as a percent)	2.83%						5.50%						5.50%
Initial term for interest payment	5 years
Percentage of the funding for the purchase of a corporate aircraft	100.00%
Period of time over which maintenance obligations are projected							6 months
Minimum amount of cash from maintenance reserve payments required to be held in restricted cash account									9,000,000
Face amount	13,400,000					390,000,000						8,700,000				36,000,000
One-month LIBOR rate (as a percent)		0.15%	0.18%
Acquisition of remaining outstanding shares of previously held equity method investment (as a percent)					50.00%
Controlling interest assumed (as a percent)					100.00%
Number of term notes held																2
Leverage ratio																										3.75
Extended maturity term																							5 years
Aggregate maturities
2014		8,711,000
2015		35,495,000
2016 (includes $349.0 million outstanding on revolving credit facility)		28,809,000
2017		38,568,000
2018		35,099,000
Thereafter		614,548,000
Notes payable		$ 761,230,000		$ 787,614,000			$ 356,900,000	$ 370,600,000		$ 435,900,000	$ 13,200,000		$ 7,800,000	$ 8,200,000	$ 25,600,000			$ 14,800,000	$ 15,800,000