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Debt Obligations - Schedule of Notes Payable (Details)
 9 Months Ended
Sep. 30, 2023
USD ($)
airframe
Dec. 31, 2022
USD ($)
Long Term Debt    
Gross amount of debt $ 1,800,039,000 $ 1,862,089,000
Less: unamortized debt issuance costs (12,015,000) (14,811,000)
Total debt obligations 1,788,024,000 1,847,278,000
Credit facility at a floating rate of interest of one-month term Secured Overnight Financing Rate (“SOFR”) plus 1.75% at September 30, 2023, secured by engines. The facility has a committed amount of $1.0 billion at September 30, 2023, which revolves until the maturity date of June 2024    
Long Term Debt    
Line of credit facility outstanding amount $ 730,000,000 727,000,000
WEST VI Series A 2021 term notes payable at a fixed rate of interest of 3.10%, maturing in May 2046, secured by engines and one airframe    
Long Term Debt    
Fixed rate (as a percent) 3.10%  
Number of assets used to secure debt | airframe 1  
Gross amount of debt $ 255,305,000 262,779,000
WEST VI Series B 2021 term notes payable at a fixed rate of interest of 5.44%, maturing in May 2046, secured by engines and one airframe    
Long Term Debt    
Fixed rate (as a percent) 5.44%  
Number of assets used to secure debt | airframe 1  
Gross amount of debt $ 35,464,000 36,502,000
WEST VI Series C 2021 term notes payable at a fixed rate of interest of 7.39%, maturing in May 2046, secured by engines and one airframe    
Long Term Debt    
Fixed rate (as a percent) 7.39%  
Number of assets used to secure debt | airframe 1  
Gross amount of debt $ 12,945,000 14,738,000
WEST V Series A 2020 term notes payable at a fixed rate of interest of 3.23%, maturing in March 2045, secured by engines    
Long Term Debt    
Fixed rate (as a percent) 3.23%  
Gross amount of debt $ 244,959,000 255,136,000
WEST V Series B 2020 term notes payable at a fixed rate of interest of 4.21%, maturing in March 2045, secured by engines    
Long Term Debt    
Fixed rate (as a percent) 4.21%  
Gross amount of debt $ 34,125,000 35,542,000
WEST V Series C 2020 term notes payable at a fixed rate of interest of 6.66%, maturing in March 2045, secured by engines    
Long Term Debt    
Fixed rate (as a percent) 6.66%  
Gross amount of debt $ 11,395,000 13,314,000
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    
Fixed rate (as a percent) 4.75%  
Gross amount of debt $ 217,765,000 238,072,000
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    
Fixed rate (as a percent) 5.44%  
Gross amount of debt $ 30,777,000 36,386,000
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    
Fixed rate (as a percent) 4.69%  
Gross amount of debt $ 182,991,000 209,061,000
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    
Fixed rate (as a percent) 6.36%  
Gross amount of debt $ 24,729,000 30,255,000
Note payable at a fixed rate of interest of 4.23%, maturing in July 2031, secured by an engine    
Long Term Debt    
Fixed rate (as a percent) 4.23%  
Gross amount of debt $ 17,825,000 0
Note payable at a fixed rate of interest of 3.18%, maturing in July 2024, secured by an aircraft    
Long Term Debt    
Fixed rate (as a percent) 3.18%  
Gross amount of debt $ 1,759,000 $ 3,304,000
Revolving credit facility | Credit facility at a floating rate of interest of one-month term Secured Overnight Financing Rate (“SOFR”) plus 1.75% at September 30, 2023, secured by engines. The facility has a committed amount of $1.0 billion at September 30, 2023, which revolves until the maturity date of June 2024    
Long Term Debt    
Line of credit facility, maximum borrowing capacity $ 1,000,000,000.0  
SOFR | Credit facility at a floating rate of interest of one-month term Secured Overnight Financing Rate (“SOFR”) plus 1.75% at September 30, 2023, secured by engines. The facility has a committed amount of $1.0 billion at September 30, 2023, which revolves until the maturity date of June 2024    
Long Term Debt    
Variable rate (as a percent) 1.75%