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Reconciliation of Total Segment Assets to Total Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total segment assets | $ 3,226,103 | $ 2,944,744 | $ 2,136,168
Other assets | 67,440 | 34,343 |
Total assets | $ 3,293,543 | $ 2,979,087 |

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