Property and Equipment, net - Interest Cost Capitalized and Depreciation and Amortization Expense for Property and Equipment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Property Plant And Equipment [Abstract]
Interest cost capitalized	$ 2.3		$ 3.9	$ 1.0
Depreciation and amortization expense for property and equipment	$ 30.0	$ 31.4	$ 57.7	$ 63.6