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Amounts recognized in accumulated other comprehensive income that have not been recognized (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss $ 1,988 $ 3,371 $ 4,060
Total $ 1,988 $ 3,371 $ 4,060