Stock Options Outstanding and Exercisable (Detail) (USD $)					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 $10.00-19.99	Dec. 31, 2013 $20.00-50.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Option Price Range Minimum
Option Price Range Maximum					$ 19.99	$ 50.00
Outstanding Number of Shares	127,144	134,644	182,665	318,265	45,000	82,144
Outstanding Weighted Average Life in Years					1 year 3 months	9 months 11 days
Outstanding Weighted Average Exercise Price	$ 20.20	$ 19.82	$ 19.11	$ 19.23	$ 18.25	$ 21.27
Exercisable Number of Shares	127,144				45,000	82,144
Exercisable Weighted Average Exercise Price	$ 20.20				$ 18.25	$ 21.27