Pension, Profit Sharing, and Other Employee Benefit Plans (Company's pension plan weighted average) (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
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	4.60%	10.90%
Equity Securities:
Defined Benefit Plan Disclosure [Line Items]
Total pension plan sssets	69.40%	67.10%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan sssets	26.00%	22.00%