Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Land	$ 76,437	$ 74,600
Buildings and equipment	412,999	139,908
Other	10,431	6,355
Total property, plant and equipment	499,867	220,863
Proved oil and gas properties	1,122	1,122
Less accumulated depreciation and depletion	(49,727)	(26,845)
Property, plant and equipment, net	451,262	195,140
Depreciation and depletion expense	$ 23,100	$ 15,300	$ 11,200