Employee Benefits - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Maximum percentage of a participant's eligible compensation that a participating may elect to contribute, on a tax-deferred annually to the plan (as a percent)	80.00%
Percentage of matching contribution made by company, of first 6.0% of participating employees contributions (as a percent)	50.00%
Percentage of participating employees contribution, matched 100% (as a percent)	6.00%
Employer contribution	$ 12,200	$ 11,100	$ 10,800
Non-qualified deferred income (expense) of investment	15,400	19,200	$ (4,900)
Non-qualified deferred compensation plan assets	127,332	106,851
Non-qualified deferred compensation plan liabilities	$ 127,332	$ 106,851