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Segment Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Segment | Jun. 30, 2012 | Dec. 31, 2012 Segment | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Number of operating business segments |  |  | 3 |  | 3 |  |  |
Amount of revenue from major customer of total revenue | $ 89,175 | $ 84,372 | $ 176,514 | $ 166,860 | $ 341,684 | [1] | $ 321,122 | [1]
Major Customer | Sales Revenue, Net |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Amount of revenue from major customer of total revenue |  |  |  |  | $ 151,400 |  | $ 147,100 |
Revenue from next largest customer, percentage of total revenue |  |  |  |  | 44.00% |  | 46.00% |
Puerto Rico | Sales Revenue, Net |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenue from next largest customer, percentage of total revenue |  |  |  |  | 9.00% |  | 11.00% |
[1] | Revenues are based on subsidiaries' country of domicile.

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