Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Abstract]
Depreciation and amortization expense on property and equipment	$ 475,484	$ 428,309	$ 373,107
Interest capitalized	$ 9,723	$ 7,888	$ 6,408