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The Amounts in AOCI That are Expected to be Amortized as Net Expense (Income) During Next Fiscal Year (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Pension Plans, Defined Benefit
 
Schedule of Pension and Other Postretirment Benefits Expected Benefit Payments [Line Items]  
Amount of net prior service cost $ (124)
Amount of net loss 1,962
Other Postretirement Benefit Plans, Defined Benefit
 
Schedule of Pension and Other Postretirment Benefits Expected Benefit Payments [Line Items]  
Amount of net prior service cost 0
Amount of net loss $ 230