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Cash, Cash Equivalents, and Investments - Summary of Available-for-Sale Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost $ 375,053
Gross Unrealized Gains 611
Gross Unrealized Losses (1,391)
Fair Value 374,273
Corporate Bonds [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 190,166
Corporate Bonds [Member] | Short-Term Investments [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 80,547
Gross Unrealized Gains 119
Gross Unrealized Losses (280)
Fair Value 80,386
Corporate Bonds [Member] | Long-Term Investments [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 109,785
Gross Unrealized Gains 373
Gross Unrealized Losses (378)
Fair Value 109,780
Asset-Backed Securities [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 68,176
Asset-Backed Securities [Member] | Short-Term Investments [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 27,076
Gross Unrealized Gains 6
Gross Unrealized Losses (172)
Fair Value 26,910
Asset-Backed Securities [Member] | Long-Term Investments [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 41,539
Gross Unrealized Gains 6
Gross Unrealized Losses (279)
Fair Value 41,266
Municipal Bonds [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 28,583
Municipal Bonds [Member] | Short-Term Investments [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 14,416
Gross Unrealized Gains 28
Gross Unrealized Losses (1)
Fair Value 14,443
Municipal Bonds [Member] | Long-Term Investments [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 14,110
Gross Unrealized Gains 62
Gross Unrealized Losses (32)
Fair Value 14,140
Sovereign Bonds [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 30,435
Sovereign Bonds [Member] | Short-Term Investments [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 7,396
Gross Unrealized Losses (13)
Fair Value 7,383
Sovereign Bonds [Member] | Long-Term Investments [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 23,199
Gross Unrealized Gains 17
Gross Unrealized Losses (164)
Fair Value 23,052
Commercial Paper [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 3,000
Commercial Paper [Member] | Short-Term Investments [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 3,000
Fair Value 3,000
Agency Bonds [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 1,498
Agency Bonds [Member] | Short-Term Investments [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 1,498
Fair Value 1,498
Treasury Bills [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Fair Value 52,415
Treasury Bills [Member] | Long-Term Investments [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 52,487
Gross Unrealized Losses (72)
Fair Value $ 52,415