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Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in Accumulated Other Comprehensive (Income) Loss (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Changes in Plan Assets and Benefit Obligations Recognized in Accumulated Other Comprehensive (Income) Loss      
Total recognized in accumulated other comprehensive income (loss) $ 2,454 $ (454) $ (1,332)
Pension Plans, Defined Benefit [Member]
      
Other Changes in Plan Assets and Benefit Obligations Recognized in Accumulated Other Comprehensive (Income) Loss      
Net (gain) loss (2,364) 456 902
Amortization of prior service cost    (2) (4)
Amortization of net obligation at transition         
Total recognized in accumulated other comprehensive income (loss) (2,364) 454 898
Total Recognized in Net Periodic Benefit Cost and Accumulated Other Comprehensive Income (Loss) $ (1,525) $ 963 $ 1,476