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Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Pulp, paperboard and tissue products $ 165,281 $ 154,460
Materials and supplies 85,987 82,005
Logs, pulpwood, chips and sawdust 14,775 21,564
Inventories $ 266,043 $ 258,029