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Employee Benefit Plans - Unfunded Post Retirement Benefits Plan (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Compensation And Retirement Disclosure [Abstract]      
Benefit obligation at beginning of year $ 2,224 $ 1,674 $ 1,073
Interest cost 84 69 56
Service cost 125 88 49
Actual claims (167) (184) (262)
Plan amendment (602) 0 0
Actuarial loss 821 577 758
Benefit obligation at end of year $ 2,485 $ 2,224 $ 1,674