Employee Benefits - Sensitivity of Disclosures to Changes in Selected Assumptions (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
25 BP Decrease in Discount Rate, Change in ABO	$ 1,638
25 BP Decrease in Discount Rate, Change in pension expense	44
U.S. Pension Plans [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
25 BP Decrease in Discount Rate, Change in PBO	14,603
25 BP Decrease in Discount Rate, Change in ABO	14,524
25 BP Decrease in Discount Rate, Change in pension expense	(102)
25 BP Decrease in Long-Term Rate of Return, Change in pension expense	1,248
Non-U.S. Plans [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
25 BP Decrease in Discount Rate, Change in PBO	46,475
25 BP Decrease in Discount Rate, Change in ABO	44,628
25 BP Decrease in Discount Rate, Change in pension expense	2,710
25 BP Decrease in Long-Term Rate of Return, Change in pension expense	$ 1,911