Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Commitments [Line Items]
Rent expense	$ 9.9	$ 7.5	$ 6.8
Deferred rent	6.5	6.9
Letters of credit outstanding amount	$ 2.7	$ 3.7
Letters of credit expiry date	Oct. 31, 2022
Capital Lease Agreements
Other Commitments [Line Items]
Lease expiration date	Mar. 31, 2015