Stock Plans and Other Incentives - Option Activity and Other Plan Data (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at beginning of period, Options	645,448	663,172	680,896
Granted, Options
Exercised, Options	(8,862)	(8,862)	(8,862)
Cancelled through cash settlement, Options	(8,862)	(8,862)	(8,862)
Forfeited/cancelled/expired, Options
Outstanding at end of period, Options	627,724	645,448	663,172
Options exercisable at end of period, Options	627,724	420,448	361,172
Options exercisable which can be settled in cash, Options	17,724	35,448	53,172
Weighted average fair value of options granted per year (per option)
Weighted average remaining contractual life at end of period	4 years 6 months	5 years 3 months 18 days	6 years 2 months 12 days
Outstanding at beginning of period, Weighted-Average Exercise Price	$ 8.94	$ 8.82	$ 8.73
Granted, Weighted-Average Exercise Price
Exercised, Weighted-Average Exercise Price	$ (5.24)	$ (4.46)	$ (5.43)
Cancelled through cash settlement, Weighted-Average Exercise Price	$ (5.24)	$ (4.46)	$ (5.43)
Forfeited/cancelled/expired, Weighted-Average Exercise Price
Outstanding at end of period, Weighted-Average Exercise Price	$ 9.05	$ 8.94	$ 8.82
Options exercisable at end of period, Weighted-Average Exercise Price	$ 9.05	$ 9.43	$ 9.10
Options exercisable which can be settled in cash, Weighted-Average Exercise Price	$ 4.09	$ 4.67	$ 4.60