Stock-Based Compensation - Summary of Activity of Non-Performance Based and Performance Based Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Non-Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Under option, beginning of year, Shares	148,498	187,032	208,993
Granted, Shares
Exercised, Shares	(27,657)		(1,234)
Forfeited, Shares	(5,382)	(38,534)	(20,727)
Under option, end of year, Shares	115,459	148,498	187,032
Exercisable at end of year, Shares	115,459	148,498	182,945
Under option, beginning of year, Weighted-Average Exercise Price	$ 16.37	$ 15.32	$ 14.73
Granted, Weighted-Average Exercise Price
Exercised, Weighted-Average Exercise Price	$ 13.29		$ 8.51
Forfeited, Weighted-Average Exercise Price	$ 13.43	$ 11.28	$ 9.83
Under option, end of year, Weighted-Average Exercise Price	$ 17.24	$ 16.37	$ 15.32
Exercisable at end of year, Weighted-Average Exercise Price	$ 17.24	$ 16.37	$ 13.87
Under option, end of year, Weighted Average Contractual Term	3 years 15 days	3 years 4 months 2 days	4 years 4 months 21 days
Exercised, Aggregate Intrinsic Value			$ 3
Exercisable at end of year, Weighted Average Contractual Term	3 years 15 days	3 years 4 months 2 days	4 years 4 months 17 days
Under option, end of year, Aggregate Intrinsic Value	641	1	8
Exercisable at end of year, Aggregate Intrinsic Value	641	1	8
Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Under option, beginning of year, Shares	391,321	393,891	441,185
Granted, Shares
Exercised, Shares	(4,524)		(2,468)
Forfeited, Shares	(15,797)	(2,570)	(44,826)
Under option, end of year, Shares	371,000	391,321	393,891
Exercisable at end of year, Shares	351,856	369,766	324,271
Under option, beginning of year, Weighted-Average Exercise Price	$ 16.43	$ 16.45	$ 16.43
Granted, Weighted-Average Exercise Price
Exercised, Weighted-Average Exercise Price	$ 7.47		$ 9.07
Forfeited, Weighted-Average Exercise Price	$ 13.22	$ 19.67	$ 16.76
Under option, end of year, Weighted-Average Exercise Price	$ 16.67	$ 16.43	$ 16.45
Exercisable at end of year, Weighted-Average Exercise Price	$ 17.27	$ 17.05	$ 18.21
Under option, end of year, Weighted Average Contractual Term	3 years 1 month 13 days	4 years 1 month 28 days	6 years 2 months 1 day
Exercised, Aggregate Intrinsic Value			4
Exercisable at end of year, Weighted Average Contractual Term	3 years 4 days	4 years 18 days	5 years 9 months 7 days
Under option, end of year, Aggregate Intrinsic Value	1,401	774	320
Exercisable at end of year, Aggregate Intrinsic Value	$ 1,145	$ 435	$ 128