Segment Information (Details) - Reconciliation of Segment Gross Contribution to Net Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Costs and expenses:
Cost of services and product development - unallocated	$ 352,004	$ 231,422	$ 589,613	$ 443,463
Selling, general and administrative	408,226	272,009	712,470	529,420
Acquisition and integration charges	98,332	8,033	111,604	16,401
Operating (loss) income	(98,388)	83,299	(44,874)	147,728
Interest expense and other, net	44,363	6,108	49,380	10,230
(Benefit) provision for income taxes	(50,470)	25,565	(38,406)	40,884
Net (loss) income	(92,281)	51,626	(55,848)	96,614
Reportable segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment gross contribution	499,036	383,024	$ 887,653	733,570
Reportable segments | Maximum
Costs and expenses:
Percent of target bonus allocated to segments			100.00%
Corporate and other expenses
Costs and expenses:
Cost of services and product development - unallocated	7,309	4,448	$ 8,366	9,769
Selling, general and administrative	408,226	272,009	712,470	529,420
Depreciation and amortization	83,557	15,235	100,087	30,252
Acquisition and integration charges	$ 98,332	$ 8,033	$ 111,604	$ 16,401