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Debt Obligations - Schedule of Notes Payable (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jul. 31, 2019 | Jun. 30, 2019 | Feb. 28, 2019
Long Term Debt [Line Items] |  |  |  |  |
Long-term debt outstanding | $ 1,712,886,000 | $ 1,270,469,000 |  |  |
Less: unamortized debt issuance costs | (19,133,000) | (19,463,000) |  |  |
Total debt obligations | 1,693,753,000 | 1,251,006,000 |  |  |
Credit facility at a floating rate of interest of one-month LIBOR plus 1.38% at December 31, 2020, secured by engines. The facility has a committed amount of $1.0 billion at December 31, 2020, which revolves until the maturity date of June 2024 |  |  |  |  |
Long Term Debt [Line Items] |  |  |  |  |
Line of credit facility outstanding amount | $ 777,000,000 | 397,000,000 |  |  |
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 | $ 286,863,000 | 0 |  |  |
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 | $ 39,855,000 | 0 |  |  |
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 | $ 19,043,000 | 0 |  |  |
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 | $ 277,481,000 | 307,014,000 |  |  |
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 | $ 39,640,000 | 43,859,000 |  |  |
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 | $ 227,138,000 | 257,754,000 |  |  |
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 | $ 32,481,000 | $ 36,860,000 |  |  |
WEST II Series A 2012 term notes payable at a fixed rate of interest of 5.50%, repaid in March 2020, secured by engines |  |  |  |  |
Long Term Debt [Line Items] |  |  |  |  |
Fixed rate |  | 5.50% |  |  |
Long-term debt outstanding | 0 | $ 211,572,000 |  |  |
Note payable at three-month LIBOR plus a margin ranging from 1.85% to 2.50% at December 31, 2020, maturing in July 2022, secured by engines |  |  |  |  |
Long Term Debt [Line Items] |  |  |  |  |
Long-term debt outstanding | $ 6,138,000 | 7,286,000 |  |  | $ 8,100,000
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 | $ 7,247,000 | $ 9,124,000 |  |  |
Note payable at a fixed rate of interest of 3.18%, maturing in July 2024, secured by an aircraft | Maximum |  |  |  |  |
Long Term Debt [Line Items] |  |  |  |  |
Fixed rate |  |  | 3.18% |  |
Revolving credit facility | Credit facility at a floating rate of interest of one-month LIBOR plus 1.38% at December 31, 2020, secured by engines. The facility has a committed amount of $1.0 billion at December 31, 2020, which revolves until the maturity date of June 2024 |  |  |  |  |
Long Term Debt [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 1,000,000,000.0 |
LIBOR | Credit facility at a floating rate of interest of one-month LIBOR plus 1.38% at December 31, 2020, secured by engines. The facility has a committed amount of $1.0 billion at December 31, 2020, which revolves until the maturity date of June 2024 |  |  |  |  |
Long Term Debt [Line Items] |  |  |  |  |
Variable rate spread | 1.38% |  |  |  |
LIBOR | Note payable at three-month LIBOR plus a margin ranging from 1.85% to 2.50% at December 31, 2020, maturing in July 2022, secured by engines | Minimum |  |  |  |  |
Long Term Debt [Line Items] |  |  |  |  |
Variable rate spread | 1.85% |  |  |  |
LIBOR | Note payable at three-month LIBOR plus a margin ranging from 1.85% to 2.50% at December 31, 2020, maturing in July 2022, secured by engines | Maximum |  |  |  |  |
Long Term Debt [Line Items] |  |  |  |  |
Variable rate spread | 2.50% |  |  |  |

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