Employee Benefit Plans - Information Concerning Defined Benefit Pension Plans (Including Certain Plans for Which ABO Exceeds Fair Value of Plan Assets) (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
PBO	$ 50,350	$ 49,249	$ 53,978
Fair value of plan assets	46,313	40,626	$ 44,222
U.S.
Defined Benefit Plan Disclosure [Line Items]
PBO for plans for which ABO exceeds plan assets	42,198	40,643
ABO for plans for which ABO exceeds plan assets	42,198	40,643
Fair value of plan assets for plans for which ABO exceeds plan assets	33,867	30,122
U.S. | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
PBO	42,198	40,643
Fair value of plan assets	33,867	30,122
U.K. | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
PBO	8,152	8,606
Fair value of plan assets	$ 12,446	$ 10,504