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Reclassifications of Accumulated Other Comprehensive Loss (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
[1]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Reclassifications, net of tax $ (1,336)
Past-service cost  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Reclassifications, before tax 62 [2]
Actuarial losses  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Reclassifications, before tax (2,343) [2]
Amortization of defined benefit pension  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Reclassifications, before tax (2,281)
Tax benefit 945
Reclassifications, net of tax $ (1,336)
[1] Amounts in parentheses indicate expense items.
[2] Please see Note 9, "Pension and Other Post-Retirement Benefits," for additional information.