Weighted Average Assumptions Used In Determining Pension Plan Information (Detail) (Pension Plans, Defined Benefit)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Defined Benefit
Net Cost
Discount rate	4.58%	3.89%	4.73%
Expected return on plan assets	7.26%	7.27%	7.52%
Rate of compensation increase	3.49%	3.38%	3.76%
Benefit Obligation
Discount rate	3.79%	4.58%	3.89%
Rate of compensation increase	3.42%	3.49%	3.38%