Pensions and Postretirement Benefits Other than Pensions - Weighted Average Assumptions Used to Determine Benefit Obligations (Detail)	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits - All Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.70%	4.53%
Pension Benefits - Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.75%	4.55%
Pension Benefits - International [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.59%	4.49%
Other Postretirement Benefits - All Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.80%	4.60%
Other Postretirement Benefits - Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.80%	4.60%