Note 14. Other Comprehensive Income (Loss) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$ (7,754,000)	$ (1,652,000)	$ 6,006,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	5,300,000
Unrealized Gain (Loss) on Investments	600,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	400,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax			$ 2,000,000