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Restructuring Activities (Detail) (Current Liabilities, Employee severance, benefits and related costs, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Current Liabilities | Employee severance, benefits and related costs
 
Restructuring Cost and Reserve [Line Items]  
Original Charges and Amounts Accrued $ 3,909
(Reversals) or Adjustments to Charges (202)
Amounts Paid Through December 31, 2012 3,666
Amounts Accrued at December 31, 2012 $ 41