Summarize Information about Stock Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower limit	$ 65.43
Exercise Price, Upper limit	$ 79.20
Options Outstanding, Shares	5,749
Options Outstanding, Weighted Average Remaining Contractual Life	1 month 6 days
Options Outstanding, Weighted Average Exercise Price	$ 79.20
Options Exercisable, Shares		32,265
Options Exercisable, Weighted Average Remaining Contractual Life		8 months 12 days