Reconciliation of Ireland Statutory Corporate Income Tax Rate to Company's Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Effective Tax Rates Line Items
Ireland statutory corporate income tax rate	12.50%	12.50%	12.50%
Income (loss) of Irish non-trading entities	(0.50%)	(9.90%)	(11.50%)
Foreign rate differential	9.00%	5.10%	(20.90%)
Uncertain tax positions	(40.40%)	14.80%	16.20%
Change in deferred tax asset valuation allowance	0.80%	17.20%	9.80%
Permanent differences	2.90%	3.50%	17.10%
Tax credits	(3.10%)	(3.90%)
Deferred charge on intercompany transaction	2.70%	3.50%
Other differences	0.50%	(0.90%)
Effective income tax rate	(15.60%)	41.90%	23.20%