Other Assets - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2027	Dec. 31, 2019
Schedule of Other Assets [Line Items]
Prepaid expenses, net of current portion	$ 22,418		$ 191
Funds received from investor	$ 2,800
Minimum | Certain Limited Partnerships
Schedule of Other Assets [Line Items]
Partnership interest (as a percentage)	3.00%
Maximum | Certain Limited Partnerships
Schedule of Other Assets [Line Items]
Partnership interest (as a percentage)	5.00%
Forecast
Schedule of Other Assets [Line Items]
Additional investment		$ 1,800
Jack Welch Management Institute
Schedule of Other Assets [Line Items]
Commitment for future services under the perpetual license agreement	$ 25,300
Prepaid expenses, net of current portion	$ 20,700
Prepaid expense, amortization period	15 years
Funds received from investor	$ 2,800