Issued and Outstanding Stock Options (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Long-Term Stock Incentive Plans:
Options outstanding at the beginning of period	3,581,752
Granted
Exercised	0	20,000
Forfeited	(353,417)
Expired
Options outstanding at the end of period	3,228,335
Options exercisable at the end of the period	3,228,335
Options outstanding at the beginning of year, weighted average exercise price	$ 15.44
Granted
Exercised
Forfeited	$ 14.94
Expired
Options outstanding at the end of year, weighted average exercise price	$ 15.49
Options exercisable at the end of the year, exercise price	$ 15.49