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Note 7. Employee Benefit Plans (Detail) - Net Periodic Pension Cost (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 15 Months Ended
Jun. 30, 2012
Pension Benefits [Member]
Jun. 30, 2011
Pension Benefits [Member]
Jun. 30, 2012
Pension Benefits [Member]
Jun. 30, 2011
Pension Benefits [Member]
Jun. 30, 2012
Other Benefits [Member]
Jun. 30, 2012
Other Benefits [Member]
Jun. 30, 2011
Other Benefits [Member]
Jun. 30, 2012
Other Benefits [Member]
Service cost $ 994 $ 970 $ 1,987 $ 1,939 $ 17 $ 34 $ 27 $ 13
Interest cost 1,017 1,029 2,034 2,057 20 39 39 20
Expected return on plan assets (1,145) (1,371) (2,290) (2,741) 22 22 22 22
Amortization of prior service cost 100 100 200 201 (26) (15) (22) (33)
Amortization of net (gain) loss 706 220 1,413 440 7     11
Net periodic benefit cost $ 1,672 $ 948 $ 3,344 $ 1,896 $ 40 $ 80 $ 66 $ 33