Condensed Consolidating Financial Statements Income Statement (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Condensed Income Statements, Captions [Line Items]    
Revenue $ 4,914,479 $ 3,219,716
Cost of revenue 4,599,817 2,971,344
Gross profit 314,662 248,372
Expenses:    
Selling, general and administrative 130,519 100,495
Depreciation of property and equipment 12,368 6,970
Amortization of intangible assets 54,986 50,056
Operating Expenses 197,873 157,521
Operating income 116,789 90,851
Interest and other (income) expense, net 11,336 11,039
Equity in (income) in subsidiaries 0 0
Income before income taxes 105,453 79,812
Income tax expense 28,108 23,028
Net income 77,345 56,784
Less: Net income attributable to non-controlling interest 13,900 5,376
Net income attributable to the Company 63,445 51,408
Reportable Legal Entities [Member] | Catamaran Corporation [Member]
    
Condensed Income Statements, Captions [Line Items]    
Revenue 11,041 7,913
Cost of revenue 9,594 7,139
Gross profit 1,447 774
Expenses:    
Selling, general and administrative 319 314
Depreciation of property and equipment 9 9
Amortization of intangible assets 0 0
Operating Expenses 328 323
Operating income 1,119 451
Interest and other (income) expense, net 9,966 (15,052)
Equity in (income) in subsidiaries (72,292) (35,904)
Income before income taxes 63,445 51,407
Income tax expense 0 0
Net income 63,445 51,407
Less: Net income attributable to non-controlling interest 0 0
Net income attributable to the Company 63,445 51,407
Reportable Legal Entities [Member] | Guarantors [Member]
    
Condensed Income Statements, Captions [Line Items]    
Revenue 4,577,654 2,865,980
Cost of revenue 4,339,549 2,668,224
Gross profit 238,105 197,756
Expenses:    
Selling, general and administrative 101,330 81,962
Depreciation of property and equipment 11,238 6,269
Amortization of intangible assets 53,339 48,422
Operating Expenses 165,907 136,653
Operating income 72,198 61,103
Interest and other (income) expense, net 778 25,538
Equity in (income) in subsidiaries (17,402) (14,169)
Income before income taxes 88,822 49,734
Income tax expense 16,530 13,830
Net income 72,292 35,904
Less: Net income attributable to non-controlling interest 0 0
Net income attributable to the Company 72,292 35,904
Reportable Legal Entities [Member] | Non-Guarantors [Member]
    
Condensed Income Statements, Captions [Line Items]    
Revenue 697,416 466,834
Cost of revenue 622,306 416,992
Gross profit 75,110 49,842
Expenses:    
Selling, general and administrative 28,870 18,219
Depreciation of property and equipment 1,121 692
Amortization of intangible assets 1,647 1,634
Operating Expenses 31,638 20,545
Operating income 43,472 29,297
Interest and other (income) expense, net 592 553
Equity in (income) in subsidiaries 0 0
Income before income taxes 42,880 28,744
Income tax expense 11,578 9,198
Net income 31,302 19,546
Less: Net income attributable to non-controlling interest 0 0
Net income attributable to the Company 31,302 19,546
Consolidations [Member]
    
Condensed Income Statements, Captions [Line Items]    
Revenue (371,632) (121,011)
Cost of revenue (371,632) (121,011)
Gross profit 0 0
Expenses:    
Selling, general and administrative 0 0
Depreciation of property and equipment 0 0
Amortization of intangible assets 0 0
Operating Expenses 0 0
Operating income 0 0
Interest and other (income) expense, net 0 0
Equity in (income) in subsidiaries 89,694 50,073
Income before income taxes (89,694) (50,073)
Income tax expense 0 0
Net income (89,694) (50,073)
Less: Net income attributable to non-controlling interest 13,900 5,376
Net income attributable to the Company $ (103,594) $ (55,449)