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Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Land $ 79,330 $ 76,437  
Buildings and equipment 433,977 412,999  
Other 15,931 10,431  
Total property, plant and equipment 529,238 499,867  
Proved oil and gas properties 400 1,122  
Less accumulated depreciation and depletion (79,622) (49,727)  
Property, plant and equipment, net 450,016 451,262  
Depreciation and depletion expense $ 31,800 $ 23,100 $ 15,300