XML 34 R38.htm IDEA: XBRL DOCUMENT v2.4.0.8
Schedule of Reported Financial Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets $ 1,031,602 $ 1,006,429
Liabilities   388
Cash and Cash Equivalents
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 227,601 338,920
Marketable securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 501,148 431,516
Long-term marketable securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 302,846 235,872
Other Accrued Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities   388
Prepayments and other current assets
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 7 121
Quoted Prices in Active Markets for Identical Instruments (Level 1)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 617,661 644,226
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Cash and Cash Equivalents
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 223,430 322,393
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Marketable securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 289,230 239,192
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Long-term marketable securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 105,001 82,641
Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 413,941 362,203
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 4,171 16,527
Significant Other Observable Inputs (Level 2) | Marketable securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 211,918 192,324
Significant Other Observable Inputs (Level 2) | Long-term marketable securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 197,845 153,231
Significant Other Observable Inputs (Level 2) | Prepayments and other current assets
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 7 121
Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities   388
Significant Unobservable Inputs (Level 3) | Other Accrued Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities   $ 388