Property, Plant and Equipment (Property, Plant and Equipment) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Property, plant and equipment, net	$ 6,343,637		$ 6,343,637		$ 6,420,062
Depreciation expense on property, plant and equipment	$ 116,160	$ 75,143	$ 334,545	$ 189,114