Qualified Employee Benefit Plans - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) investment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contributions to qualified profit sharing plan	$ 14,400	$ 15,000	$ 14,400
Defined contribution expense for foreign entities	7,700	7,100	6,800
Other comprehensive (loss) gain	(7,593)
Loss to be amortized over next fiscal year	$ 1,100	1,100	1,100
Liability Hedging Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	20.00%
Retirement plan, number of investments | investment	3
Return Seeking Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	27.00%
Risk Mitigating Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	14.00%
Diversifying Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	21.00%
Dynamic Asset Allocation
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	18.00%
Fixed Income Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investment	2
Equity mutual fund
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investment	7
U.S. Based Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investment	4
Non-U.S. Based Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investment	3
Equity Private Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investment	1
Collective Investment Trust
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investment	1
Minimum | Liability Hedging Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	10.00%
Minimum | Return Seeking Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	15.00%
Minimum | Risk Mitigating Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	5.00%
Minimum | Diversifying Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	10.00%
Minimum | Dynamic Asset Allocation
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	5.00%
Maximum | Liability Hedging Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	35.00%
Maximum | Return Seeking Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	40.00%
Maximum | Risk Mitigating Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	35.00%
Maximum | Diversifying Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	35.00%
Maximum | Dynamic Asset Allocation
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	35.00%
Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 4,000	5,000
Other comprehensive (loss) gain	(7,598)	1,687	(3,068)
Discount rate and lump sum interest rates	21,700	9,700	11,900
Changes in census data	100	200	1,400
Earnings of plan assets exceeding expectations	11,300	9,200	8,500
Mortality assumption	$ 1,200	400	$ 700
Defined benefit plan, amortization period	30 years 10 months 24 days
Future amortization of prior service cost	$ 24
Loss to be amortized over next fiscal year	1,400
Accumulated benefit obligation	$ 136,100	$ 116,200
Assumptions used calculating benefit obligation, discount rate, percent	3.35%	4.40%
Expected long-term rate of return on plan assets	5.75%	5.75%	6.00%