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Expense Benefit from Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Federal-U.S. $ 10,265 $ 3,908 $ 1,068
State-U.S. 2,565 1,101 122
Total Current 12,830 5,009 1,190
Deferred:      
Federal-U.S. (2,803) (1,936) (1,604)
State-U.S. (911) (557) (87)
Change in valuation allowance 22,515 5,566 6,035
Total Deferred (3,714) (2,493) (1,691)
(Provision for) benefit from income taxes 9,116 2,516 (501)
Republic of Ireland and the United Kingdom
      
Deferred:      
Ireland and United Kingdom $ (22,515) $ (5,566) $ (6,035)