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Segment Information - Adjusted EBITDA (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]          
Management fee paid with IPO proceeds $ 21,000        
Maximum percentage of management fee payable from adjusted EBITDA   1.00%      
Adjusted EBITDA   $ 227,573 $ 214,548 $ 471,159 $ 425,811
Less adjustments:          
Depreciation and amortization of property and equipment   46,244 40,661 107,907 81,110
Amortization of capitalized implementation costs   7,902 8,890 15,426 17,987
Acquisition related amortization   23,211 21,953 44,886 54,842
Amortization of upfront incentive consideration   10,878 11,742 22,050 22,789
Interest expense, net   42,609 53,235 89,062 117,179
Loss on extinguishment of debt   33,235 30,558 33,235 33,538
Other, net   (197) (391) 4,248 1,963
Restructuring and other costs   0 2,128 0 3,684
Acquisition-related costs   2,053 0 3,864 0
Litigation costs   2,043 2,572 5,479 7,118
Stock-based compensation expense   7,330 4,885 16,124 8,484
Management fees   0 21,576 0 23,508
Provision for income taxes   19,676 10,284 46,959 25,195
Income from continuing operations   $ 32,589 $ 6,455 $ 81,919 $ 28,414
Minimum [Member]          
Segment Reporting Information [Line Items]          
Average expected life of the service contract to cost of revenue   3 years      
Management fee paid with IPO proceeds   $ 5,000      
Maximum [Member]          
Segment Reporting Information [Line Items]          
Average expected life of the service contract to cost of revenue   5 years      
Management fee paid with IPO proceeds   $ 7,000