Note 2. Long-Term Incentive Plans (Detail) - Stock Option Activity	3 Months Ended
	Mar. 31, 2013
Number of Options
Outstanding at January 1, 2013	4,294,273
Outstanding at March 31, 2013	4,205,862
Granted	60,000
Exercised	(50,000)
Forfeited and cancelled	(98,411)