Property and Equipment - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 16.2	$ 11.2	$ 6.1
Amortization expense of capitalized internal-use software	7.4	6.2	$ 3.8
Carrying value of capitalized internal-use software	15.4	14.1
Capitalized internal-use software included in construction in progress	$ 5.4	$ 1.5