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Plant, Equipment and Timberlands - Summary of Interest Expense Capitalized (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest Expense [Abstract]      
Interest cost incurred $ 16,005 $ 15,066 $ 14,169
Interest capitalized 396 1,749 319
Interest expense $ 15,609 $ 13,317 $ 13,850