Pension and Other Employee Benefits - Discount Rate Used in Computation of Respective Benefit Obligations (Detail) - Pension Benefits [Member]	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
US Plan [Member]
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate used in benefit obligation		3.30%
Non-U.S. Plans [Member]
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate used in benefit obligation	1.20%	1.76%