Pension and Other Employee Benefits - Discount Rate Used in Computation of Respective Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
US Pension Benefits [Member]
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate used in benefit obligation	3.80%	3.90%
Non-US Pension Benefits [Member]
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate used in benefit obligation	1.75%	2.25%