Pension and Other Employee Benefits - Economic Assumptions Used in Computation of Respective Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
US Pension Benefits [Member]
Economic Assumptions Used In Measuring Of Fair Value Securitized Loans [Line Items]
Discount rate	3.90%	3.70%
Expected return on plan assets	3.90%	3.70%
Non-US Pension Benefits [Member]
Economic Assumptions Used In Measuring Of Fair Value Securitized Loans [Line Items]
Discount rate	2.50%	2.50%
Expected return on plan assets	2.50%	2.50%