Plant, Equipment and Timberlands - Summary of Plant, Equipment and Timberlands (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ (1,125,203)	$ (1,036,825)
Subtotal	755,240	633,831
Construction in progress	105,673	137,665
Timberlands, less depletion	4,830	4,402
Total	865,743	775,898	$ 698,864
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	221,436	192,877
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,484,545	1,335,669
Furniture, Fixtures, and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 174,462	$ 142,110