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Debt Obligations - Schedule of Notes Payable (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Feb. 28, 2019
Dec. 31, 2018
Long Term Debt      
Gross amount of debt $ 1,279,216   $ 1,358,430
Less: unamortized debt issuance costs (20,232)   (21,081)
Total debt obligations 1,258,984   1,337,349
Credit facility at a floating rate of interest of one-month LIBOR plus 1.375% at September 30, 2019, secured by engines. The facility has a committed amount of $1.0 billion at September 30, 2019, which revolves until the maturity date of June 2024      
Long Term Debt      
Line of credit facility outstanding amount 384,000   427,000
WEST IV Series A 2018 term notes payable at a fixed rate of interest of 4.75%, maturing in September 2043, secured by engines      
Long Term Debt      
Gross amount of debt $ 311,606   323,075
Fixed rate (as a percent) 4.75%    
WEST IV Series B 2018 term notes payable at a fixed rate of interest of 5.44%, maturing in September 2043, secured by engines      
Long Term Debt      
Gross amount of debt $ 44,515   46,154
Fixed rate (as a percent) 5.44%    
WEST III Series A 2017 term notes payable at a fixed rate of interest of 4.69%, maturing in August 2042, secured by engines      
Long Term Debt      
Gross amount of debt $ 262,902   274,205
Fixed rate (as a percent) 4.69%    
WEST III Series B 2017 term notes payable at a fixed rate of interest of 6.36%, maturing in August 2042, secured by engines      
Long Term Debt      
Gross amount of debt $ 37,596   39,212
Fixed rate (as a percent) 6.36%    
WEST II Series A 2012 term notes payable at a fixed rate of interest of 5.50%, maturing in September 2037, secured by engines      
Long Term Debt      
Gross amount of debt $ 221,445   237,847
Fixed rate (as a percent) 5.50%    
Note payable at three-month LIBOR plus a margin ranging from 1.85% to 2.50% at September 30, 2019, maturing in July 2022, secured by engines      
Long Term Debt      
Gross amount of debt $ 7,565 $ 8,100 0
Note payable at fixed rate of interest of 3.18%, maturing in July 2024, secured by an aircraft      
Long Term Debt      
Gross amount of debt $ 9,587   $ 10,937
Fixed rate (as a percent) 3.18%    
LIBOR | Credit facility at a floating rate of interest of one-month LIBOR plus 1.375% at September 30, 2019, secured by engines. The facility has a committed amount of $1.0 billion at September 30, 2019, which revolves until the maturity date of June 2024      
Long Term Debt      
Variable rate spread 1.375%    
LIBOR | Note payable at three-month LIBOR plus a margin ranging from 1.85% to 2.50% at September 30, 2019, maturing in July 2022, secured by engines | Minimum      
Long Term Debt      
Variable rate spread 1.85%    
LIBOR | Note payable at three-month LIBOR plus a margin ranging from 1.85% to 2.50% at September 30, 2019, maturing in July 2022, secured by engines | Maximum      
Long Term Debt      
Variable rate spread 2.50%