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Gains on Dispositions of Plant, Equipment and Timberlands (Summary for Sale of Timberlands and Other Assets) (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
a
Jun. 30, 2017
USD ($)
a
Jun. 30, 2018
USD ($)
a
Jun. 30, 2017
USD ($)
a
Property, Plant and Equipment [Line Items]        
Proceeds     $ 2,384 $ 83
Gain (loss) $ 579 $ 58 $ 2,133 $ 26
Timberlands [Member]        
Property, Plant and Equipment [Line Items]        
Acres | a 1,029 46 1,029 46
Proceeds     $ 1,785 $ 75
Gain (loss)     1,680 74
Other [Member]        
Property, Plant and Equipment [Line Items]        
Proceeds     599 8
Gain (loss)     $ 453 $ (48)