Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Service Costs
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 3.4	$ 7.7	$ 3.1