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Postretirement plan expected to be recognized in accumulated other comprehensive income (Detail) (Other Postretirement Benefit Plans Defined Benefit [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Postretirement Benefit Plans Defined Benefit [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net prior service cost $ 0 $ 0 $ (200)
Net loss $ 1,892