Company's pension plan weighted average (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
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	10.90%	11.10%
Equity Securities:
Defined Benefit Plan Disclosure [Line Items]
Total pension plan sssets	67.10%	58.50%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan sssets	22.00%	30.40%