Property and Equipment - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Abstract]
Software under capital lease and vendor financing obligations	$ 3.8	$ 3.8
Software under capital lease and vendor financing obligations, accumulated amortization		3.7
Amortization expense for assets under capital lease and vendor financing obligations		0.7	$ 0.7
Accelerated depreciation expense	$ 2.1	$ 1.3	$ 0.8