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Debt Obligations - Additional Information (Details) - USD ($)
 1 Months Ended
Oct. 31, 2024
May 31, 2024
Oct. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Long Term Debt [Line Items]          
Gross amount of debt       $ 2,292,726,000 $ 1,827,059,000
WEST V          
Long Term Debt [Line Items]          
Fixed rate (as a percent)     8.00%    
Notes issue price, percentage of par     98.84814%    
WEST VI Notes | WEST VI          
Long Term Debt [Line Items]          
Debt instrument, face amount     $ 410,000,000    
WEST VI Series A Notes          
Long Term Debt [Line Items]          
Gross amount of debt       $ 241,065,000 252,986,000
Fixed rate (as a percent)       3.10%  
WEST VI Series B Notes          
Long Term Debt [Line Items]          
Gross amount of debt       $ 33,486,000 35,142,000
Fixed rate (as a percent)       5.44%  
WEST VI Series C Notes          
Long Term Debt [Line Items]          
Gross amount of debt       $ 9,926,000 12,361,000
Fixed rate (as a percent)       7.39%  
Note payable at a fixed rate of interest of 5.00%, maturing in February 2033, secured by an engine          
Long Term Debt [Line Items]          
Gross amount of debt       $ 20,780,000 0
Option to repurchase amount       $ 18,400,000  
Fixed rate (as a percent)       5.00%  
Note payable at a fixed rate of interest of 4.59%, maturing in November 2032, secured by an engine          
Long Term Debt [Line Items]          
Gross amount of debt       $ 22,094,000 22,610,000
Option to repurchase amount       $ 17,700,000  
Fixed rate (as a percent)       4.59%  
Note payable at a fixed rate of interest of 4.23%, maturing in June 2032, secured by an engine          
Long Term Debt [Line Items]          
Gross amount of debt       $ 17,710,000 17,802,000
Option to repurchase amount       $ 17,000,000.0  
Fixed rate (as a percent)       4.23%  
WWFL credit facility at a floating rate of interest of one-month term SOFR, plus 2.25% at December 31, 2024, maturing in May 2029, secured by engines, airframes, and loan assets          
Long Term Debt [Line Items]          
Gross amount of debt       $ 221,882,000 0
Debt instrument, term (in years)   5 years      
Line of credit facility, maximum borrowing capacity   $ 500,000,000      
Availability period (in years)   2 years      
Revolving credit facility          
Long Term Debt [Line Items]          
Line of credit facility, maximum borrowing capacity       500,000,000  
Revolving credit facility | Revolving credit facility          
Long Term Debt [Line Items]          
Line of credit facility, remaining borrowing capacity       307,000,000.0 $ 355,000,000.0
Revolving credit facility | WWFL credit facility at a floating rate of interest of one-month term SOFR, plus 2.25% at December 31, 2024, maturing in May 2029, secured by engines, airframes, and loan assets          
Long Term Debt [Line Items]          
Line of credit facility, remaining borrowing capacity       $ 278,100,000  
Line of Credit | Revolving credit facility          
Long Term Debt [Line Items]          
Debt instrument, face amount $ 1,000,000,000.0        
Debt instrument, term (in years) 5 years