Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Taxes [Line Items]
Income tax provision	$ 29,945	$ 24,221	$ 92,651	$ 60,598
Effective income tax rate, percentage	25.40%		27.30%
Acquired in-process research and development	$ 0	$ 75,000	$ 0	$ 202,000
Non-Taxable Jurisdiction [Member]
Income Taxes [Line Items]
Modified effective income tax rate, percentage		19.40%		25.40%
Ireland [Member]
Income Taxes [Line Items]
Effective statutory income tax rate, percentage	12.50%		12.50%