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Notes Payable (Details)
 1 Months Ended 12 Months Ended 24 Months Ended
Mar. 25, 2015
USD ($)
Dec. 31, 2014
Jul. 16, 2014
USD ($)
Jan. 10, 2014
engine
Sep. 17, 2012
USD ($)
engine
Apr. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
item
Sep. 18, 2013
USD ($)
Long Term Debt                        
One-month LIBOR rate (as a percent)             0.77% 0.43%   0.77%    
Principal outstanding repayable                        
2017             $ 23,624,000     $ 23,624,000    
2018             33,294,000     33,294,000    
2019             23,430,000     23,430,000    
2020             23,031,000     23,031,000    
2021             631,268,000     631,268,000    
Thereafter             179,056,000     179,056,000    
Notes payable             913,703,000 $ 878,684,000   913,703,000    
Less: unamortized debt issuance costs             (13,448,000) (12,595,000)   (13,448,000)    
Total notes payable             900,255,000 866,089,000   900,255,000    
Notes payable             900,255,000 866,089,000   $ 900,255,000    
Net proceeds received from notes issued and sold             $ 149,000,000 192,700,000 $ 154,395,000      
WOLF                        
Principal outstanding repayable                        
Acquisition of remaining outstanding shares of previously held equity method investment (as a percent)             100.00%     100.00%   50.00%
WEST II                        
Principal outstanding repayable                        
Fixed amortization of notes payable             $ 0          
WEST II Series 2012-A term notes payable at a fixed rate of interest maturing in September 2037. Secured by engines | WEST II                        
Long Term Debt                        
Fixed rate (as a percent)             5.50%     5.50%    
Principal outstanding repayable                        
Notes payable             $ 279,541,000 300,467,000   $ 279,541,000    
Maturity term             10 years          
Face amount         $ 390,000,000              
Net proceeds received from notes issued and sold         384,900,000              
Number of engines in portfolio offered as collateral | item             58          
Number of business days to pay interest             5 days          
WEST II Series 2012-A term notes payable at a fixed rate of interest maturing in September 2037. Secured by engines | WEST II | Minimum                        
Principal outstanding repayable                        
Minimum amount of cash from maintenance reserve payments required to be held in restricted cash account             $ 9,000,000     9,000,000    
Note payable at fixed interest rates ranging from 2.60% to 2.97%, maturing in July 2024. Secured by an aircraft                        
Long Term Debt                        
Initial term for interest payment             5 years          
Principal outstanding repayable                        
Notes payable             $ 14,453,000 16,135,000   $ 14,453,000    
Maturity term     10 years                  
Face amount     $ 13,400,000               $ 4,700,000  
Number of term notes held | item                     2  
Note payable at fixed interest rates ranging from 2.60% to 2.97%, maturing in July 2024. Secured by an aircraft | Minimum                        
Long Term Debt                        
Fixed rate (as a percent)             2.60%     2.60%    
Note payable at fixed interest rates ranging from 2.60% to 2.97%, maturing in July 2024. Secured by an aircraft | Maximum                        
Long Term Debt                        
Fixed rate (as a percent)             2.97%     2.97%    
Note payable at a fixed interest rate of 2.25%, maturing in January 2018, secured by engines                        
Long Term Debt                        
Fixed rate (as a percent)             2.25%     2.25%    
Principal outstanding repayable                        
Notes payable             $ 11,709,000 13,082,000   $ 11,709,000    
Maturity term       4 years                
Number of engines pledged as collateral | engine       3                
Note payable at a fixed interest rate of 2.25%, maturing in January 2018, secured by engines | One-month LIBOR                        
Long Term Debt                        
Fixed rate (as a percent)       2.25%                
Prior WEST notes                        
Principal outstanding repayable                        
Notes payable         $ 435,900,000              
Notes payable Member                        
Principal outstanding repayable                        
Total notes payable             900,300,000     900,300,000    
Notes payable             $ 900,300,000     $ 900,300,000    
Notes payable Member | Minimum                        
Long Term Debt                        
Fixed rate (as a percent)             2.60%     2.60%    
Principal outstanding repayable                        
Maturity term             1 year          
Notes payable Member | Maximum                        
Long Term Debt                        
Fixed rate (as a percent)             5.50%     5.50%    
Principal outstanding repayable                        
Maturity term             7 years 6 months          
Revolving credit facility                        
Long Term Debt                        
Basis spread on variable rate (as a percent)           2.75%            
Maximum borrowing capacity under credit facility           $ 890,000,000            
Amount of debt available under accordion feature           1,000,000,000            
Principal outstanding repayable                        
Leverage ratio   3.15             3.15      
Remaining borrowing capacity available             $ 282,000,000 151,000,000   $ 282,000,000    
Maximum borrowing capacity under credit facility before amendment           $ 700,000,000            
Revolving credit facility | One-month LIBOR                        
Long Term Debt                        
Basis spread on variable rate (as a percent)   2.75%                    
Revolving credit facility | WEST                        
Principal outstanding repayable                        
Number of engines pledged as collateral | engine         22              
Revolving credit facility | Credit agreement | Minimum                        
Principal outstanding repayable                        
Interest coverage ratio             2.25     2.25    
Revolving credit facility | Credit agreement | Maximum                        
Principal outstanding repayable                        
Leverage ratio             4.25     4.25    
Credit facility at a floating rate of interest of LIBOR plus 2.75%, secured by engines                        
Long Term Debt                        
Maximum borrowing capacity under credit facility             $ 890,000,000     $ 890,000,000    
Principal outstanding repayable                        
Notes payable             $ 608,000,000 549,000,000   $ 608,000,000    
Credit facility at a floating rate of interest of LIBOR plus 2.75%, secured by engines | LIBOR                        
Long Term Debt                        
Basis spread on variable rate (as a percent)                   2.75%    
Term notes | WOLF                        
Principal outstanding repayable                        
Notes payable               $ 24,000,000        
Face amount                       $ 36,000,000
Loan Paid off $ 23,100,000                      
Discount (in percentage) 5.00%                      
Number of term notes held | item               2