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Investment in Equity Investee - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity interest in CONTADO acquisition |  |  |  |  |  | 19.99%
Equity interest in CONTADO, excess cost of investment over underlying equity in net assets |  |  |  |  |  | $ 9,000,000
Earnings of equity method investment | 348,000 | 509,000 | 625,000 | 575,000 | 564,000 | 833,000
Dividends Received from CONTADO |  |  |  |  | 1,600,000 | 1,500,000
Equity Method Investments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity interest in CONTADO, amortization expense |  |  |  |  | $ 400,000 | $ 300,000

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