Segment and Other Information - Summary of Total Revenues Attributed to Geographic Sources (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 336,010	$ 309,303
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	305,879	269,247
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	25,020	32,635
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 5,111	$ 7,421