Credit Facilities - Additional Information (Details) - USD ($)	Jul. 21, 2020	Sep. 30, 2020	Jul. 20, 2020
2020 Credit Facility
Line of Credit Facility [Line Items]
Line of credit, available borrowings	$ 300,000,000.0
Outstanding borrowings		$ 0
2018 Credit Facility
Line of Credit Facility [Line Items]
Line of credit, available borrowings			$ 200,000,000.0
Letter of Credit | 2020 Credit Facility
Line of Credit Facility [Line Items]
Line of credit, available borrowings	$ 50,000,000.0
Letter of Credit | 2018 Credit Facility
Line of Credit Facility [Line Items]
Line of credit, available borrowings			$ 50,000,000.0
Base Rate | 2020 Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
London Interbank Offered Rate (LIBOR) | 2020 Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Minimum | Base Rate | 2020 Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Minimum | London Interbank Offered Rate (LIBOR) | 2020 Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.50%
Maximum | Base Rate | 2020 Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.25%
Maximum | London Interbank Offered Rate (LIBOR) | 2020 Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.25%