Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	$ 308,544
Marketable Securities, short-term	3,104
Favip Contingent Consideration	0
Total Financial Assets at Fair Value	311,648
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0
Marketable Securities, short-term	0
Favip Contingent Consideration	0
Total Financial Assets at Fair Value	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0
Marketable Securities, short-term	0
Favip Contingent Consideration	2,519
Total Financial Assets at Fair Value	$ 2,519