Segment and Other Information - Summary of Total Revenues Attributed to Geographic Sources (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 374,181	$ 340,872	$ 1,091,352	$ 983,922
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	339,825	305,585	991,557	877,397
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	25,788	26,076	79,557	82,837
All other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 8,568	$ 9,211	$ 20,238	$ 23,688