Note 8. Employee Benefit Plans (Detail) - Amounts Recognized in the Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Other non- current liabilities:
Accrued benefit liability	$ (2,040)
Pension Benefits [Member]
Other non-current assets:
Prepaid benefit costs		1,438
Current liabilities:
Accrued benefit liability	(330)	(323)
Other non- current liabilities:
Accrued benefit liability	(22,484)	(7,577)
Accumulated other comprehensive (income) loss	30,747	17,859
Net amount recognized	7,933	11,397
Other Benefits [Member]
Current liabilities:
Accrued benefit liability	(52)	(54)
Other non- current liabilities:
Accrued benefit liability	(1,620)	(1,375)
Accumulated other comprehensive (income) loss	(269)	(395)
Net amount recognized	$ (1,941)	$ (1,824)