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Benefit Plans - Schedule of Weighted Average Assumptions and Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Weighted Average Assumptions:      
Discount rate 3.95% 3.50% 4.50%
Expected return on plan assets         
Rate of compensation increase 3.00% 3.00% 3.00%
Components of net periodic benefit cost and other amounts recognized in other comprehensive income:      
Service cost $ 521 $ 506 $ 429
Interest cost 673 642 638
Expected return on plan assets         
Amortization of transition obligation         
Amortization of prior service cost (216) (233) (233)
Amortization of net loss 966 671 557
Net periodic benefit cost 1,944 1,586 1,391
Net (gain) loss (933) 224 262
Amortization of prior service cost 216 233 233
Total recognized in other comprehensive income (717) 457 495
Total recognized in net periodic benefit cost and other comprehensive income $ 1,227 $ 2,043 $ 1,886