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Plant, Equipment and Timberlands - Summary of Interest Expense Capitalized (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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

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