Pension and Other Postretirement Benefits - Summary of Target Asset Allocations and Major Asset Categories (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
U.S. Pension Benefits [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	65.00%
Percentage of Plan Assets	64.00%	65.00%
U.S. Pension Benefits [Member] | Fixed - Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	15.00%
Percentage of Plan Assets	18.00%	19.00%
U.S. Pension Benefits [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	15.00%
Percentage of Plan Assets	16.00%	15.00%
U.S. Pension Benefits [Member] | Other (Primarily Cash and Cash Equivalents) [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	5.00%
Percentage of Plan Assets	2.00%	1.00%
Foreign Pension Benefits [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	44.00%
Percentage of Plan Assets	44.00%	46.00%
Foreign Pension Benefits [Member] | Fixed - Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	35.00%
Percentage of Plan Assets	35.00%	31.00%
Foreign Pension Benefits [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	21.00%
Percentage of Plan Assets	21.00%	23.00%
Foreign Pension Benefits [Member] | Other (Primarily Cash and Cash Equivalents) [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%
Percentage of Plan Assets	0.00%	0.00%