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Reclassification Out of Accumulated Other Comprehensive Income to Statement of Operations (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Unrealized gains, net of tax $ 704 $ 1,433 $ 447
Prior service benefit [1] 295 295 276
Total reclassifications 999 1,728 723
Interest Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Unrealized gains, net of tax $ 704 $ 1,433 $ 447
[1] The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note M: "Retirement Plans."