Property and Equipment, net - Interest Cost Capitalized and Depreciation and Amortization Expense for Property and Equipment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Property Plant And Equipment [Abstract]
Interest cost capitalized	$ 3.2	$ 1.0	$ 7.1	$ 4.0
Depreciation and amortization expense for property and equipment	$ 31.1	$ 31.0	$ 88.8	$ 94.6