XML 26 R24.htm IDEA: XBRL DOCUMENT v3.3.0.814
Cash and Investments in Marketable Securities - Portfolio of Cash and Investments in Marketable Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments $ 246,070 $ 225,459
Cash, including restricted cash 1,589 26,136
Total cash and investments in marketable securities 267,819 262,824
Corporate Notes and Bonds [Member] | Fair Value Hierarchy Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 180,300 182,544
Corporate Commercial Paper [Member] | Fair Value Hierarchy Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 65,770 42,915
Money Market Funds [Member] | Fair Value Hierarchy Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable securities 17,230 11,229
Certificates of Deposit [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable securities $ 2,930 $ 0