Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Lease Expiration Date	Dec. 31, 2020
Operating Leases, Rent Expense, Net	$ 10.5	$ 10.1	$ 9.9
Purchase Commitments	$ 15.6