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Debt Obligations - Schedule of Notes Payable (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2019
Long Term Debt [Line Items] |  |  |
Long-term debt outstanding | $ 1,862,089,000 | $ 1,809,620,000 |
Less: unamortized debt issuance costs | (14,811,000) | (19,356,000) |
Total debt obligations | 1,847,278,000 | 1,790,264,000 |
Credit facility at a floating rate of interest of one-month LIBOR plus 1.75% at December 31, 2022, secured by engines. The facility has a committed amount of $1.0 billion at December 31, 2022, which revolves until the maturity date of June 2024 |  |  |
Long Term Debt [Line Items] |  |  |
Line of credit facility outstanding amount | $ 727,000,000 | 590,000,000 |
WEST VI Series A 2021 term notes payable at a fixed rate of interest of 3.10%, maturing in May 2046, secured by engines |  |  |
Long Term Debt [Line Items] |  |  |
Fixed rate | 3.10% |  |
Long-term debt outstanding | $ 262,779,000 | 273,723,000 |
WEST VI Series B 2021 term notes payable at a fixed rate of interest of 5.44%, maturing in May 2046, secured by engines |  |  |
Long Term Debt [Line Items] |  |  |
Fixed rate | 5.44% |  |
Long-term debt outstanding | $ 36,502,000 | 38,022,000 |
WEST VI Series C 2021 term notes payable at a fixed rate of interest of 7.39%, maturing in May 2046, secured by engines |  |  |
Long Term Debt [Line Items] |  |  |
Fixed rate | 7.39% |  |
Long-term debt outstanding | $ 14,738,000 | 18,158,000 |
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 [Line Items] |  |  |
Fixed rate | 3.23% |  |
Long-term debt outstanding | $ 255,136,000 | 272,909,000 |
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 [Line Items] |  |  |
Fixed rate | 4.21% |  |
Long-term debt outstanding | $ 35,542,000 | 38,004,000 |
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 [Line Items] |  |  |
Fixed rate | 6.66% |  |
Long-term debt outstanding | $ 13,314,000 | 16,342,000 |
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 [Line Items] |  |  |
Fixed rate | 4.75% |  |
Long-term debt outstanding | $ 238,072,000 | 262,260,000 |
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 [Line Items] |  |  |
Fixed rate | 5.44% |  |
Long-term debt outstanding | $ 36,386,000 | 38,885,000 |
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 [Line Items] |  |  |
Fixed rate | 4.69% |  |
Long-term debt outstanding | $ 209,061,000 | 223,815,000 |
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 [Line Items] |  |  |
Fixed rate | 6.36% |  |
Long-term debt outstanding | $ 30,255,000 | 32,195,000 |
Note payable at a fixed rate of interest of 3.18%, maturing in July 2024, secured by an aircraft |  |  |
Long Term Debt [Line Items] |  |  |
Fixed rate | 3.18% |  |
Long-term debt outstanding | $ 3,304,000 | $ 5,307,000 |
Revolving credit facility | Credit facility at a floating rate of interest of one-month LIBOR plus 1.75% at December 31, 2022, secured by engines. The facility has a committed amount of $1.0 billion at December 31, 2022, which revolves until the maturity date of June 2024 |  |  |
Long Term Debt [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | $ 1,000,000,000 |  | $ 1,000,000,000
LIBOR | Credit facility at a floating rate of interest of one-month LIBOR plus 1.75% at December 31, 2022, secured by engines. The facility has a committed amount of $1.0 billion at December 31, 2022, which revolves until the maturity date of June 2024 |  |  |
Long Term Debt [Line Items] |  |  |
Variable rate spread | 1.75% |  |

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