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Gain on Dispositions of Plant, Equipment and Timberlands - Summary for Sale of Timberlands and Other Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Proceeds $ 1,947 $ 10,272 $ 4,491
Gain 1,726 9,815 3,950
Timberlands [Member]
      
Property, Plant and Equipment [Line Items]      
Acres 876 4,830 942
Proceeds 1,445 9,494 3,821
Gain 1,410 9,203 3,590
Other [Member]
      
Property, Plant and Equipment [Line Items]      
Acres         
Proceeds 502 778 670
Gain $ 316 $ 612 $ 360