Incentive Compensation Plan - Outstanding Stock Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of the year, Shares	196,322	496,863	640,866
Granted, Shares	0	0	0
Exercised, Shares	0	(130,672)	(13,760)
Forfeited, Shares	(169,322)	(169,869)	(130,243)
Balance, end of the year, Shares	27,000	196,322	496,863
Exercisable at the end of the year, Shares	27,000	196,322	496,863
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of the year, Weighted Average Exercise Price	$ 11.64	$ 10.03	$ 10.05
Granted, Weighted Average Exercise Price	$ 0.00	$ 0.00	$ 0.00
Exercised, Weighted Average Exercise Price	$ 0.00	$ 6.76	$ 5.29
Forfeited, Weighted Average Exercise Price	$ 11.19	$ 10.68	$ 10.61
Balance, end of the year, Weighted Average Exercise Price	$ 14.49	$ 11.64	$ 10.03
Exercisable at the end of the year, Weighted Average Exercise Price	$ 14.49	$ 11.64	$ 10.03