Property and Equipment - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 3.9	$ 2.6	$ 7.6	$ 4.9
Amortization expense of capitalized internal-use software	1.8	$ 1.5	3.5	$ 3.0
Carrying value of capitalized internal-use software	14.4		14.4		$ 14.1
Capitalized internal-use software included in construction in progress	$ 3.0		$ 3.0		$ 1.5