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Gains on Dispositions of Plant, Equipment and Timberlands, Net - Summary for Sale of Timberlands and Other Assets (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
a
Jun. 30, 2014
USD ($)
a
Property, Plant and Equipment [Line Items]        
Proceeds     $ 3,051 $ 2,360
Gain $ 111 $ 1,482 $ 2,765 $ 2,291
Timberlands [Member]        
Property, Plant and Equipment [Line Items]        
Acres | a     1,398 935
Proceeds     $ 2,794 $ 2,355
Gain     2,705 2,290
Other [Member]        
Property, Plant and Equipment [Line Items]        
Proceeds     257 5
Gain     $ 60 $ 1