Employer Sponsored Benefit Plan (Target Allocation and the Actual Allocation of Plan Assets) (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
U.S. Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	43.00%	37.00%
Non U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	19.00%	23.00%
Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	6.00%	7.00%
U.S. Bond funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	26.00%	26.00%
Non U.S. Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	3.00%	5.00%
Real estate investment trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	0.00%	0.00%
Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation of Plan Assets	3.00%	2.00%
Maximum [Member] | U.S. Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	60.00%
Maximum [Member] | Non U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	25.00%
Maximum [Member] | Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	9.00%
Maximum [Member] | U.S. Bond funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	38.00%
Maximum [Member] | Non U.S. Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	8.00%
Maximum [Member] | Real estate investment trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	8.00%
Maximum [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	5.00%
Minimum [Member] | U.S. Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	22.00%
Minimum [Member] | Non U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	15.00%
Minimum [Member] | Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	3.00%
Minimum [Member] | U.S. Bond funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	12.00%
Minimum [Member] | Non U.S. Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	2.00%
Minimum [Member] | Real estate investment trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%
Minimum [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%