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Stockholders' Equity - Schedule of Reclassification Adjustments (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Equity [Abstract]    
Unrealized gain on investments $ (57) $ (12)
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax 21 4
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax (36) (8)
Recognized net actuarial loss 584 565
Amortization of prior service credit (453) (557)
Other Comprehensive Income Loss Pension and Other Postretirement Benefit Plans Prior Service Cost Recognized and Gain Loss Recognized In Net Periodic Benefit Cost Reclassification Adjustment Tax (50) (4)
Other comprehensive income loss pension and other postretirement benefit plans, cost reclassification adjustment net of tax, income tax expense $ 81 $ 4