Condensed Consolidating Financial Statements Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net cash provided (used) by operating activities $ 192,886 $ 236,253
Cash flows from investing activities:    
Acquisitions, net of cash acquired (2,026) (7,076)
Purchases of property and equipment (32,873) (72,135)
Proceeds from restricted cash 0 20,004
Net cash used by investing activities (34,899) (59,207)
Cash flows from financing activities:    
Proceeds from issuance of debt 492,500 100,000
Repayment of long-term debt (312,500) (250,000)
Payment of financing costs (1,963) (2,347)
Proceeds from exercise of options 4,944 1,928
Proceeds from exercise of warrants 3,453 0
Tax benefit on option exercises 3,993 9,479
Payments of contingent consideration 0 (23,203)
Net transactions with parent and affiliates 0 0
Distributions to non-controlling interest (25,800) (10,115)
Proceeds from restricted stock 0 0
Other (321) 0
Net cash (used) provided by financing activities 164,306 (174,258)
Effect of foreign exchange on cash balances 14 24
Change in cash and cash equivalents 322,307 2,812
Cash and cash equivalents, beginning of period 387,241 370,776
Cash and cash equivalents, end of period 709,548 373,588
Reportable Legal Entities [Member] | Catamaran Corporation [Member]
    
Cash flows from operating activities:    
Net cash provided (used) by operating activities 152,832 60,033
Cash flows from investing activities:    
Acquisitions, net of cash acquired 0 0
Purchases of property and equipment (18) 0
Proceeds from restricted cash   0
Net cash used by investing activities (18) 0
Cash flows from financing activities:    
Proceeds from issuance of debt 492,500 100,000
Repayment of long-term debt (312,500) (250,000)
Payment of financing costs (1,963) (2,347)
Proceeds from exercise of options 7,026 2,744
Proceeds from exercise of warrants 3,453  
Tax benefit on option exercises 0 0
Payments of contingent consideration   0
Net transactions with parent and affiliates (114,078) 51,480
Distributions to non-controlling interest 0 0
Proceeds from restricted stock 18,588 24,462
Other 0  
Net cash (used) provided by financing activities 93,026 (73,661)
Effect of foreign exchange on cash balances 14 24
Change in cash and cash equivalents 245,854 (13,604)
Cash and cash equivalents, beginning of period 15,090 33,603
Cash and cash equivalents, end of period 260,944 19,999
Reportable Legal Entities [Member] | Guarantors [Member]
    
Cash flows from operating activities:    
Net cash provided (used) by operating activities 591,827 292,494
Cash flows from investing activities:    
Acquisitions, net of cash acquired (2,026) 0
Purchases of property and equipment (18,671) (71,919)
Proceeds from restricted cash   20,004
Net cash used by investing activities (20,697) (51,915)
Cash flows from financing activities:    
Proceeds from issuance of debt 0 0
Repayment of long-term debt 0 0
Payment of financing costs 0 0
Proceeds from exercise of options (2,057) (806)
Proceeds from exercise of warrants 0  
Tax benefit on option exercises 3,955 9,472
Payments of contingent consideration   (18,338)
Net transactions with parent and affiliates (483,936) (187,511)
Distributions to non-controlling interest 0 0
Proceeds from restricted stock (18,079) (23,886)
Other (321)  
Net cash (used) provided by financing activities (500,438) (221,069)
Effect of foreign exchange on cash balances 0 0
Change in cash and cash equivalents 70,692 19,510
Cash and cash equivalents, beginning of period 350,889 303,833
Cash and cash equivalents, end of period 421,581 323,343
Reportable Legal Entities [Member] | Non-Guarantors [Member]
    
Cash flows from operating activities:    
Net cash provided (used) by operating activities (314,610) 40,384
Cash flows from investing activities:    
Acquisitions, net of cash acquired 0 (7,076)
Purchases of property and equipment (14,184) (216)
Proceeds from restricted cash   0
Net cash used by investing activities (14,184) (7,292)
Cash flows from financing activities:    
Proceeds from issuance of debt 0 0
Repayment of long-term debt 0 0
Payment of financing costs 0 0
Proceeds from exercise of options (25) (10)
Proceeds from exercise of warrants 0  
Tax benefit on option exercises 38 7
Payments of contingent consideration   (4,865)
Net transactions with parent and affiliates 335,051 (30,742)
Distributions to non-controlling interest 0 0
Proceeds from restricted stock (509) (576)
Other 0  
Net cash (used) provided by financing activities 334,555 (36,186)
Effect of foreign exchange on cash balances 0 0
Change in cash and cash equivalents 5,761 (3,094)
Cash and cash equivalents, beginning of period 21,262 33,340
Cash and cash equivalents, end of period 27,023 30,246
Consolidations [Member]
    
Cash flows from operating activities:    
Net cash provided (used) by operating activities (237,163) (156,658)
Cash flows from investing activities:    
Acquisitions, net of cash acquired 0 0
Purchases of property and equipment 0 0
Proceeds from restricted cash   0
Net cash used by investing activities 0 0
Cash flows from financing activities:    
Proceeds from issuance of debt 0 0
Repayment of long-term debt 0 0
Payment of financing costs 0 0
Proceeds from exercise of options 0 0
Proceeds from exercise of warrants 0  
Tax benefit on option exercises 0 0
Payments of contingent consideration   0
Net transactions with parent and affiliates 262,963 166,773
Distributions to non-controlling interest (25,800) (10,115)
Proceeds from restricted stock 0 0
Other 0  
Net cash (used) provided by financing activities 237,163 156,658
Effect of foreign exchange on cash balances 0 0
Change in cash and cash equivalents 0 0
Cash and cash equivalents, beginning of period 0 0
Cash and cash equivalents, end of period $ 0 $ 0