Pensions and Postretirement Benefits Other than Pensions - Weighted Average Assumptions Used to Determine Benefit Obligations (Detail)	Dec. 31, 2015	Dec. 31, 2014
Pension Benefits - All Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.10%	3.70%
Pension Benefits - Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.20%	3.75%
Pension Benefits - International [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.84%	3.59%
Other Postretirement Benefits - All Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.20%	3.80%
Other Postretirement Benefits - Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.20%	3.80%