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Debt Obligations - Schedule of Notes Payable (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Long Term Debt    
Variable rate (as a percent) 4.45% 4.37%
Gross amount of debt $ 2,834,137,000 $ 2,292,726,000
Total debt obligations $ 2,800,643,000 2,264,552,000
Credit facility at a floating rate of interest of one-month term Secured Overnight Financing Rate (“SOFR”) plus 2.60% at June 30, 2025, secured by engines, airframes, and loan assets. The facility has a committed amount of $1.0 billion at June 30, 2025, which revolves until the maturity date of October 2029.    
Long Term Debt    
Variable rate (as a percent) 2.60%  
Line of credit facility outstanding amount $ 623,000,000 693,000,000
WEST VIII Series A 2025 term notes payable at a fixed rate of interest of 5.58%, maturing in June 2050, secured by engines, airframes, and loan assets    
Long Term Debt    
Fixed rate (as a percent) 5.58%  
Gross amount of debt $ 524,000,000 0
WEST VIII Series B 2025 term note payable at a fixed rate of interest of 6.07%, maturing in June 2050, secured by engines, airframes, and loan assets    
Long Term Debt    
Fixed rate (as a percent) 6.07%  
Gross amount of debt $ 72,000,000 0
WEST VII Series A 2023 term notes payable at a fixed rate of interest of 8.00%, maturing in October 2048, secured by engines, airframes, and loan assets    
Long Term Debt    
Fixed rate (as a percent) 8.00%  
Gross amount of debt $ 338,947,000 356,355,000
WEST VI Series A 2021 term notes payable at a fixed rate of interest of 3.10%, maturing in May 2046, secured by engines, airframes, and loan assets    
Long Term Debt    
Fixed rate (as a percent) 3.10%  
Gross amount of debt $ 232,050,000 241,065,000
Less: unamortized debt issuance costs and note discounts $ (33,494,000) (28,174,000)
WEST VI Series B 2021 term notes payable at a fixed rate of interest of 5.44%, maturing in May 2046, secured by engines, airframes, and loan assets    
Long Term Debt    
Fixed rate (as a percent) 5.44%  
Gross amount of debt $ 32,215,000 33,486,000
Total debt obligations $ 2,800,643,000 2,264,552,000
WEST VI Series C 2021 term notes payable at a fixed rate of interest of 7.39%, maturing in May 2046, secured by engines, airframes, and loan assets    
Long Term Debt    
Fixed rate (as a percent) 7.39%  
Gross amount of debt $ 8,612,000 9,926,000
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 $ 220,104,000 226,572,000
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 $ 30,662,000 31,563,000
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 $ 6,884,000 8,142,000
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 $ 182,872,000 199,846,000
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 $ 25,011,000 27,338,000
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 $ 149,453,000 161,308,000
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 $ 20,067,000 21,659,000
Willis Warehouse Facility LLC (“WWFL”) credit facility at a floating rate of interest of one-month term SOFR, plus 2.25% at June 30, 2025 maturing in May 2029, secured by engines, airframes, and loan assets.    
Long Term Debt    
Fixed rate (as a percent) 2.25%  
Gross amount of debt $ 243,521,000 221,882,000
Note payable at a fixed rate of interest of 5.00%, maturing in February 2033, secured by an engine    
Long Term Debt    
Fixed rate (as a percent) 5.00%  
Gross amount of debt $ 20,643,000 20,780,000
Note payable at a fixed rate of interest of 4.59%, maturing in November 2032, secured by an engine    
Long Term Debt    
Fixed rate (as a percent) 4.59%  
Gross amount of debt $ 21,828,000 22,094,000
Note payable at a fixed rate of interest of 4.23%, maturing in June 2032, secured by an engine    
Long Term Debt    
Fixed rate (as a percent) 4.23%  
Gross amount of debt $ 17,662,000 17,710,000
Note payable at a fixed rate of interest of 5.17%, maturing in March 2033, secured by an engine    
Long Term Debt    
Fixed rate (as a percent) 5.17%  
Gross amount of debt $ 23,860,000 0
Note payable at a fixed rate of interest of 5.91%, maturing in March 2034, secured by an engine    
Long Term Debt    
Fixed rate (as a percent) 5.91%  
Gross amount of debt $ 21,007,000 0
Note payable at a fixed rate of interest of 5.83%, maturing in April 2034, secured by an engine    
Long Term Debt    
Fixed rate (as a percent) 5.83%  
Gross amount of debt $ 19,739,000 $ 0
Revolving credit facility | Credit facility at a floating rate of interest of one-month term Secured Overnight Financing Rate (“SOFR”) plus 2.60% at June 30, 2025, secured by engines, airframes, and loan assets. The facility has a committed amount of $1.0 billion at June 30, 2025, which revolves until the maturity date of October 2029.    
Long Term Debt    
Line of credit facility, maximum borrowing capacity $ 1,000,000,000.0