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Employee Benefit Plans - Recognized Net Periodic Benefit Cost and Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Compensation And Retirement Disclosure [Abstract]      
Service cost $ 125 $ 88 $ 49
Interest cost 84 69 56
Net amortization of transition obligation and actuarial loss 61 41 11
Net periodic benefit cost 270 198 116
Net loss 821 578 758
Plan amendment (602) 0 0
Amortization of loss (54) (34) (4)
Transition obligation (7) (7) (7)
Total recognized in other comprehensive income 158 537 747
Total recognized in net periodic benefit cost and other comprehensive income $ 428 $ 735 $ 863