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Cash, Cash Equivalents, and Investments - Summary of Available-for-Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | $ 412,489
Gross Unrealized Gains | 950
Gross Unrealized Losses | (918)
Fair Value | 412,521
Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value | 218,949
Corporate Bonds [Member] | Short-Term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 108,824
Gross Unrealized Gains | 281
Gross Unrealized Losses | (65)
Fair Value | 109,040
Corporate Bonds [Member] | Long-Term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 109,457
Gross Unrealized Gains | 550
Gross Unrealized Losses | (98)
Fair Value | 109,909
Asset-Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value | 75,379
Asset-Backed Securities [Member] | Short-Term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 54,061
Gross Unrealized Gains | 13
Gross Unrealized Losses | (515)
Fair Value | 53,559
Asset-Backed Securities [Member] | Long-Term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 21,866
Gross Unrealized Gains | 11
Gross Unrealized Losses | (57)
Fair Value | 21,820
Sovereign Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value | 27,833
Sovereign Bonds [Member] | Short-Term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 11,445
Gross Unrealized Gains | 16
Gross Unrealized Losses | (13)
Fair Value | 11,448
Sovereign Bonds [Member] | Long-Term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 16,376
Gross Unrealized Gains | 35
Gross Unrealized Losses | (26)
Fair Value | 16,385
Municipal Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value | 15,195
Municipal Bonds [Member] | Short-Term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 9,258
Gross Unrealized Gains | 18
Fair Value | 9,276
Municipal Bonds [Member] | Long-Term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 5,901
Gross Unrealized Gains | 22
Gross Unrealized Losses | (4)
Fair Value | 5,919
Agency Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value | 1,499
Agency Bonds [Member] | Short-Term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 1,500
Gross Unrealized Losses | (1)
Fair Value | 1,499
Treasury Bills [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value | 73,666
Treasury Bills [Member] | Long-Term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 73,801
Gross Unrealized Gains | 4
Gross Unrealized Losses | (139)
Fair Value | $ 73,666

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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