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The Company and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 1 Months Ended | 6 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended
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Apr. 01, 2013 | Jun. 30, 2013 Facility Country Transactions | Jun. 30, 2012 | Dec. 31, 2012 Country | Dec. 31, 2011 | Nov. 30, 2012 | Dec. 31, 2012 Expense Reimbursements | Dec. 31, 2011 Expense Reimbursements | Dec. 31, 2012 Software packages | Dec. 31, 2011 Software packages | Dec. 31, 2012 Software Development Minimum | Dec. 31, 2012 Software Development Maximum | Dec. 31, 2012 Software and maintenance contracts Minimum | Dec. 31, 2012 Software and maintenance contracts Maximum | Dec. 31, 2012 Senior Notes | Dec. 31, 2011 Senior Notes | Apr. 17, 2013 EVERTEC Common Stock | Apr. 17, 2013 Stockholders Common Stock | Sep. 30, 2010 Apollo | Apr. 17, 2013 Apollo Common Stock | Sep. 30, 2010 Popular | Apr. 17, 2013 Popular Common Stock | Apr. 17, 2013 IPO Common Stock | Apr. 17, 2013 2013 Credit Agreement IPO
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of countries where the Company provides a broad range of merchant acquiring, payment processing and business process management services |  | 19 |  | 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of transactions processed annually |  | 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of ATM's |  | 4,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of point-of-sale terminals |  | 104,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares for Initial Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,250,000 | 22,539,943 |  | 13,739,284 |  | 8,800,659 | 28,789,943 |
Sale of Stock Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.00 |
Net proceeds from Initial Public Offering |  | $ 91,000 | $ 250,000 | $ 450,000 | $ 2,641,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 117,400,000
Authorized common stock to issue | 206,000,000 | 206,000,000 |  | 206,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized preferred stock to issue | 2,000,000 | 2,000,000 |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest in Tarjetas Inteligentes Internacionales, S.A. |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.00% | 11.00% |  |  |  |  |  |  |  |
Senior notes, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2018 |  |  |  |  |  |  |  |  |
Stock split | Two for one |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset useful life |  |  |  |  |  |  |  |  |  |  | 3 years | 5 years | 1 year | 5 years |  |  |  |  |  |  |  |  |  |
Interest cost capitalized |  |  |  | 400,000 | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent owned by affiliate of Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% |  | 49.00% |  |  |
Software cost reimbursement |  | 4,540,000 |  | 6,099,000 | 7,113,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected reimbursement |  |  |  |  | 351,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) realized on fair value adjustment |  |  |  |  |  |  | $ 1,000,000 | $ 800,000 | $ 33,000 | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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