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Debt Obligations - Narrative (Details)	1 Months Ended		12 Months Ended
	May 31, 2021 USD ($) engine	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)
Long Term Debt [Line Items]
Loss on extinguishment of debt			$ 0	$ 4,688,000
Number of assets used to secure debt | engine	2
WEST V Notes | WEST V
Long Term Debt [Line Items]
Debt instrument, face amount		$ 366,200,000
WEST V Series A Notes
Long Term Debt [Line Items]
Fixed rate			3.23%
WEST V Series A Notes | WEST V
Long Term Debt [Line Items]
Debt instrument, face amount		$ 303,000,000
Fixed rate		3.228%
Debt term		8 years
Notes issue price, percentage of par		99.99859%
WEST V Series B Notes
Long Term Debt [Line Items]
Fixed rate			4.21%
WEST V Series B Notes | WEST V
Long Term Debt [Line Items]
Debt instrument, face amount		$ 42,100,000
Fixed rate		4.212%
Debt term		8 years
Notes issue price, percentage of par		99.99493%
WEST V Series C Notes
Long Term Debt [Line Items]
Fixed rate			6.66%
WEST V Series C Notes | WEST V
Long Term Debt [Line Items]
Debt instrument, face amount		$ 21,100,000
Fixed rate		6.657%
Debt term		8 years
Notes issue price, percentage of par		99.99918%
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%
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 A Notes | WEST VI
Long Term Debt [Line Items]
Debt instrument, face amount	$ 278,600,000
WEST VI Series B Notes
Long Term Debt [Line Items]
Fixed rate			5.44%
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 B Notes | WEST VI
Long Term Debt [Line Items]
Debt instrument, face amount	$ 38,700,000
WEST VI Series C Notes
Long Term Debt [Line Items]
Fixed rate			7.39%
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%
WEST VI Series C Notes | WEST VI
Long Term Debt [Line Items]
Debt instrument, face amount	$ 19,400,000
WEST II Notes
Long Term Debt [Line Items]
Loss on extinguishment of debt		$ 4,700,000
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
Line of credit facility, maximum borrowing capacity under accordion feature			1,300,000,000
Line of credit facility, remaining borrowing capacity			$ 410,000,000	$ 223,000,000

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