Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies [Line Items]
Rent expense	$ 7,720	$ 6,874	$ 6,119
Purchase commitment, due in next twelve months	29,400
Long-term purchase commitments	$ 30,300
Minimum
Commitments and Contingencies [Line Items]
Length of purchase commitments, in days	60 days
Maximum
Commitments and Contingencies [Line Items]
Length of purchase commitments, in days	120 days