Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Property, plant and equipment, net	$ 6,450,947		$ 6,450,947		$ 3,004,067
Depreciation expense on property, plant and equipment	$ 75,143	$ 52,208	$ 189,114	$ 153,129