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Schedule of Reported Financial Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets $ 956,253 $ 1,006,429
Liabilities 550 388
Cash and Cash Equivalents
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 305,219 338,920
Marketable securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 404,781 431,516
Long-term marketable securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 246,253 235,872
Other Accrued Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities 550 388
Prepayments and other current assets
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets   121
Quoted Prices in Active Markets for Identical Instruments (Level 1)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 624,270 644,226
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 297,974 322,393
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Marketable securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 232,452 239,192
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 93,844 82,641
Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 331,983 362,203
Liabilities 475  
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 7,245 16,527
Significant Other Observable Inputs (Level 2) | Marketable securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 172,329 192,324
Significant Other Observable Inputs (Level 2) | Long-term marketable securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 152,409 153,231
Significant Other Observable Inputs (Level 2) | Other Accrued Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities 475  
Significant Other Observable Inputs (Level 2) | Prepayments and other current assets
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets   121
Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities 75 388
Significant Unobservable Inputs (Level 3) | Other Accrued Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities $ 75 $ 388