Issued and Outstanding Stock Options (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Long-Term Stock Incentive Plans:
Options outstanding at the beginning of period	1,168,775	2,259,335
Granted	0	0
Exercised	0	0
Forfeited	(2,500)	(8,799)
Expired	(30,500)
Options outstanding at the end of period	1,135,775	2,250,536
Options exercisable at the end of the period	1,135,775	2,250,536
Options outstanding at the beginning of year, weighted average exercise price	$ 15.34	$ 15.35
Granted	0	0
Exercised	0	0
Forfeited	13.72	14.80
Expired	11.72
Options outstanding at the end of period, weighted average exercise price	15.44	15.35
Options exercisable at the end of the period, exercise price	$ 15.44	$ 15.35