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Merger with Deltic (Summary of Unaudited Pro Forma Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Business Combinations [Abstract]    
Net sales $ 289,199 $ 795,992
Net earnings attributable to PotlatchDeltic common shareholders $ 61,327 $ 142,314
Basic earnings per share attributable to PotlatchDeltic common shareholders $ 0.91 $ 2.13
Diluted earnings per share attributable to PotlatchDeltic common shareholders $ 0.91 $ 2.12