Pension, Profit Sharing, and Other Employee Benefit Plans (Company's pension plan weighted average) (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Total pension plan sssets	100.00%	100.00%
Cash and certificates of deposit
Defined Benefit Plan Disclosure [Line Items]
Total pension plan sssets	9.70%	4.60%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan sssets	71.60%	69.40%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan sssets	18.70%	26.00%