Employee Benefit Plans (Weighted-Average Actuarial Assumptions Used to Determine Benefit Obligations) (Detail)	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plans, Discount rate	4.31%	4.07%
Unfunded Supplemental Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plans, Discount rate	4.33%	4.00%