Share-Based Compensation and Pensions - Pension Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plans	$ 11,798	$ 11,434	$ 12,247
Defined benefit plan	684	2,243	1,988
Total pension expense	12,482	13,677	$ 14,235
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, unfunded liability	8,900	8,400
Accrued liability, defined benefit plan	$ 8,900	$ 8,400