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Consolidated Effective Tax Rate Differed from Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |  |
Taxes at Irish statutory rate of 12.5% (2011:12.5%; 2012: 12.5%) | $ 15,108 | $ 8,401 | $ 3,625
Foreign and other income taxed at higher/(reduced) rates | 4,229 | 7,873 | 5,373
Research & development tax incentives | (2,598) | (4,954) | (6,341)
Movement in valuation allowance | 2,389 | 1,557 | 4,362
Prior year over provision in respect of foreign taxes | (47) | (678) | (83)
Effects of permanent items | (1,002) | (26) | (615)
Other | (26) | (372) | (206)
Provision for income taxes | $ 18,053 | $ 11,801 | $ 6,115

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