Property and Equipment, net - Interest Cost Capitalized and Depreciation and Amortization Expense for Property and Equipment (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Property Plant And Equipment [Abstract]
Interest cost capitalized	$ 3.0	$ 1.6
Depreciation and amortization expense for property and equipment	$ 24.1	$ 20.6