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Income Taxes - Schedule of Net Deferred Income Tax Assets for Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Summary Of Net Deferred Tax Assets [Line Items] |  |
Current deferred income tax assets, net | $ 7,092 | $ 10,837
Non-current deferred income tax assets, net | 48,070 | 2,673
Net deferred income tax assets | $ 55,162 | $ 13,510

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