Segments and Related Information (Foreign Operations) (Narrative) (Details) - USD ($) $ in Thousands				3 Months Ended									6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment and Related Information [Line Items]
Revenue				$ 1,231,300	[1]	$ 1,315,488	$ 1,107,232	$ 957,818	$ 1,159,100	$ 1,269,400	$ 977,600	$ 918,600	$ 2,065,050	$ 3,380,538	$ 4,611,803	$ 4,324,787	$ 3,726,789
Property and equipment, net	$ 623,118	$ 488,132		623,118		$ 614,359	$ 618,672	$ 509,585	488,132				$ 618,672	$ 614,359	623,118	488,132
Intangible assets and goodwill, net	$ 1,332,800	$ 1,067,700		1,332,800					1,067,700						1,332,800	1,067,700
Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member] | Credit Concentration Risk [Member] | Foreign Customers [Member]
Segment and Related Information [Line Items]
Concentration risk, percentage of total	20.00%	9.00%	4.00%
United States [Member]
Segment and Related Information [Line Items]
Revenue															3,900,000	4,100,000	3,600,000
Property and equipment, net	$ 494,100	$ 436,900	$ 337,500	494,100					436,900						494,100	436,900	337,500
Intangible assets and goodwill, net	1,100,000	1,000,000	900,000	1,100,000					1,000,000						1,100,000	1,000,000	900,000
Foreign Operations [Member]
Segment and Related Information [Line Items]
Revenue															699,900	268,100	156,800
Property and equipment, net	129,000	51,200	11,400	129,000					51,200						129,000	51,200	11,400
Intangible assets and goodwill, net	$ 227,700	$ 92,900	$ 30,500	$ 227,700					$ 92,900						$ 227,700	$ 92,900	$ 30,500

[1] Preliminary, unaudited fourth quarter and full year 2014 results were previously issued pursuant to a press release dated February 26, 2015 and not previously filed in a report under the Securities Exchange Act of 1934, as amended. The unaudited quarterly information for the three month period ended December 31, 2014 in the table above includes the effect of adjustments determined by management following the review process described in Note 2 - Independent Investigation of the Audit Committee and Related Restatements.