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Reclassifications of Accumulated Other Comprehensive Loss (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
[1]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Reclassifications, net of tax $ (2,671)
Past-service cost  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Reclassifications, before tax 124 [2]
Actuarial losses  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Reclassifications, before tax (4,686) [2]
Amortization of defined benefit pension  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Reclassifications, before tax (4,562)
Tax benefit 1,891
Reclassifications, net of tax $ (2,671)
[1] Amounts in parentheses indicate expense items.
[2] Please see Note 9, "Pension and Other Post-Retirement Benefits," for additional information.