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Components of Total Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current:      
Current tax $ 28,526 $ 22,231 $ 12,236
Deferred expense/(benefit):      
Deferred tax expense/(benefit) (10,473) (10,430) (6,121)
Provision for income taxes 18,053 11,801 6,115
Impact on shareholders equity and other comprehensive income of the tax consequence of :      
Excess tax benefit on stock compensation (1,651) (1,274) (681)
Currency impact on long term funding 87 356 (294)
Total 16,489 10,883 5,140
Ireland
      
Current:      
Current tax 9,158 1,684 351
Deferred expense/(benefit):      
Deferred tax expense/(benefit) 1,914 (287) (3,825)
Provision for income taxes 11,073 1,216 (3,475)
United States
      
Current:      
Current tax 14,492 12,290 6,367
Deferred expense/(benefit):      
Deferred tax expense/(benefit) (9,420) (9,715) (1,711)
Provision for income taxes 5,072 3,669 4,656
Other
      
Current:      
Current tax 4,876 8,257 5,518
Deferred expense/(benefit):      
Deferred tax expense/(benefit) (2,967) (428) (585)
Provision for income taxes $ 1,915 $ 3,618 $ 4,277