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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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