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Gains on Dispositions of Plant, Equipment and Timberlands, Net - Summary for Sale of Timberlands and Other Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Property, Plant and Equipment [Line Items]        
Proceeds     $ 4,051 $ 379
Gain 1,590 282 3,881 374
Timberlands [Member]
        
Property, Plant and Equipment [Line Items]        
Acres     2,030 172
Proceeds     4,041 287
Gain     3,876 282
Other [Member]
        
Property, Plant and Equipment [Line Items]        
Proceeds     10 92
Gain     $ 5 $ 92