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Debt Obligations - Additional Information (Details)	1 Months Ended		12 Months Ended
	Dec. 31, 2022 USD ($) tranche	May 31, 2021 USD ($) engine	Dec. 31, 2022 USD ($) tranche	Dec. 31, 2021 USD ($)	Jun. 30, 2019 USD ($)
Long Term Debt [Line Items]
Note payable		$ 5,800,000
Number of assets used to secure debt | engine		2
Gain on debt extinguishment			$ 2,558,000	$ 0
Repayments of long-term debt			$ 228,840,000	416,966,000
WEST VI Notes | WEST VI
Long Term Debt [Line Items]
Debt instrument, face amount		$ 336,700,000
WEST VI Series A Notes
Long Term Debt [Line Items]
Fixed rate	3.10%		3.10%
WEST VI Series A Notes | WEST VI
Long Term Debt [Line Items]
Debt instrument, face amount		$ 278,600,000
WEST VI Series A Notes | WEST V
Long Term Debt [Line Items]
Fixed rate		3.104%
Debt term		8 years
Notes issue price, percentage of par		99.99481%
WEST VI Series B Notes
Long Term Debt [Line Items]
Fixed rate	5.44%		5.44%
WEST VI Series B Notes | WEST VI
Long Term Debt [Line Items]
Debt instrument, face amount		$ 38,700,000
WEST VI Series B Notes | WEST V
Long Term Debt [Line Items]
Fixed rate		5.438%
Debt term		8 years
Notes issue price, percentage of par		99.99996%
WEST VI Series C Notes
Long Term Debt [Line Items]
Fixed rate	7.39%		7.39%
WEST VI Series C Notes | WEST VI
Long Term Debt [Line Items]
Debt instrument, face amount		$ 19,400,000
WEST VI Series C Notes | WEST V
Long Term Debt [Line Items]
Fixed rate		7.385%
Debt term		8 years
Notes issue price, percentage of par		99.99869%
ABS Notes
Long Term Debt [Line Items]
Gain on debt extinguishment	$ 2,600,000
Number of tranches of notes repurchased | tranche	6		6
Repayments of long-term debt	$ 12,200,000
Revolving credit facility | Revolving credit facility
Long Term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	1,000,000,000		$ 1,000,000,000		$ 1,000,000,000
Line of credit facility, maximum borrowing capacity under accordion feature					$ 1,300,000,000
Line of credit facility, remaining borrowing capacity	$ 273,000,000		$ 273,000,000	$ 410,000,000

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