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Fair Value Measurements - Schedule of Fair Value Hierarchy of Financial Assets Carried at Fair Value and Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value $ 202,287  
Available-for-sale Securities, Equity Securities, Fair Value 6,569  
Total available-for-sale securities 208,856 203,480
Fair value measurements, Recurring
    
Cash equivalents:    
Total cash equivalents 41,162 55,504
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 202,287  
Available-for-sale Securities, Equity Securities, Fair Value 6,569  
Total available-for-sale securities 208,856 203,480
Total assets at fair value 250,018 258,984
Fair value measurements, Recurring | U.S. government securities
    
Cash equivalents:    
Total cash equivalents   6,400
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 51,791  
Total available-for-sale securities   58,114
Fair value measurements, Recurring | Money market and other funds
    
Cash equivalents:    
Total cash equivalents 23,128 9,391
Fair value measurements, Recurring | Commercial paper
    
Cash equivalents:    
Total cash equivalents 7,299 17,999
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 22,094  
Total available-for-sale securities   14,496
Fair value measurements, Recurring | Time deposits
    
Cash equivalents:    
Total cash equivalents 598 499
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 22,669  
Total available-for-sale securities   9,880
Fair value measurements, Recurring | Taxable municipal bonds
    
Cash equivalents:    
Total cash equivalents 10,137 21,215
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 104,195  
Total available-for-sale securities   120,990
Fair value measurements, Recurring | Corporate bonds
    
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 1,538  
Fair value measurements, Recurring | Fair Value, Inputs, Level 1
    
Cash equivalents:    
Total cash equivalents 0 0
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 0  
Available-for-sale Securities, Equity Securities, Fair Value 6,569  
Total available-for-sale securities 6,569 0
Total assets at fair value 6,569 0
Fair value measurements, Recurring | Fair Value, Inputs, Level 1 | U.S. government securities
    
Cash equivalents:    
Total cash equivalents   0
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 0  
Total available-for-sale securities   0
Fair value measurements, Recurring | Fair Value, Inputs, Level 1 | Money market and other funds
    
Cash equivalents:    
Total cash equivalents 0 0
Fair value measurements, Recurring | Fair Value, Inputs, Level 1 | Commercial paper
    
Cash equivalents:    
Total cash equivalents 0 0
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 0  
Total available-for-sale securities   0
Fair value measurements, Recurring | Fair Value, Inputs, Level 1 | Time deposits
    
Cash equivalents:    
Total cash equivalents 0 0
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 0  
Total available-for-sale securities   0
Fair value measurements, Recurring | Fair Value, Inputs, Level 1 | Taxable municipal bonds
    
Cash equivalents:    
Total cash equivalents 0 0
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 0  
Total available-for-sale securities   0
Fair value measurements, Recurring | Fair Value, Inputs, Level 1 | Corporate bonds
    
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 0  
Fair value measurements, Recurring | Significant other observable inputs (Level 2)
    
Cash equivalents:    
Total cash equivalents 41,162 55,504
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 202,287  
Available-for-sale Securities, Equity Securities, Fair Value 0  
Total available-for-sale securities 202,287 203,480
Total assets at fair value 243,449 258,984
Fair value measurements, Recurring | Significant other observable inputs (Level 2) | U.S. government securities
    
Cash equivalents:    
Total cash equivalents   6,400
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 51,791  
Total available-for-sale securities   58,114
Fair value measurements, Recurring | Significant other observable inputs (Level 2) | Money market and other funds
    
Cash equivalents:    
Total cash equivalents 23,128 9,391
Fair value measurements, Recurring | Significant other observable inputs (Level 2) | Commercial paper
    
Cash equivalents:    
Total cash equivalents 7,299 17,999
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 22,094  
Total available-for-sale securities   14,496
Fair value measurements, Recurring | Significant other observable inputs (Level 2) | Time deposits
    
Cash equivalents:    
Total cash equivalents 598 499
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 22,669  
Total available-for-sale securities   9,880
Fair value measurements, Recurring | Significant other observable inputs (Level 2) | Taxable municipal bonds
    
Cash equivalents:    
Total cash equivalents 10,137 21,215
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 104,195  
Total available-for-sale securities   120,990
Fair value measurements, Recurring | Significant other observable inputs (Level 2) | Corporate bonds
    
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 1,538  
Fair value measurements, Recurring | Significant unobservable inputs (Level 3)
    
Cash equivalents:    
Total cash equivalents 0 0
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 0  
Available-for-sale Securities, Equity Securities, Fair Value 0  
Total available-for-sale securities 0 0
Total assets at fair value 0 0
Fair value measurements, Recurring | Significant unobservable inputs (Level 3) | U.S. government securities
    
Cash equivalents:    
Total cash equivalents   0
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 0  
Total available-for-sale securities   0
Fair value measurements, Recurring | Significant unobservable inputs (Level 3) | Money market and other funds
    
Cash equivalents:    
Total cash equivalents 0 0
Fair value measurements, Recurring | Significant unobservable inputs (Level 3) | Commercial paper
    
Cash equivalents:    
Total cash equivalents 0 0
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 0  
Total available-for-sale securities   0
Fair value measurements, Recurring | Significant unobservable inputs (Level 3) | Time deposits
    
Cash equivalents:    
Total cash equivalents 0 0
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 0  
Total available-for-sale securities   0
Fair value measurements, Recurring | Significant unobservable inputs (Level 3) | Taxable municipal bonds
    
Cash equivalents:    
Total cash equivalents 0 0
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value 0  
Total available-for-sale securities   0
Fair value measurements, Recurring | Significant unobservable inputs (Level 3) | Corporate bonds
    
Available-for-sale securities:    
Available-for-sale Securities, Debt Securities, Fair Value $ 0