Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Land	$ 117,559	$ 79,330
Buildings and equipment	512,870	433,977
Other	18,939	15,931
Total property, plant, and equipment	649,368	529,238
Proved oil and gas properties	400	400
Less accumulated depreciation and depletion	(111,507)	(79,622)
Property, plant, and equipment, net	538,261	450,016
Depreciation expense	$ 39,000	$ 31,800	$ 23,100