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Cash, Cash Equivalents and Investments - Summary of Available-for-Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | $ 336,806
Gross Unrealized Gains | 1,004
Gross Unrealized Losses | (321)
Fair Value, Total | 337,489
Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Total | 146,073
Corporate Bonds [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 45,965
Gross Unrealized Gains | 68
Gross Unrealized Losses | (32)
Fair Value, Total | 46,001
Corporate Bonds [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 99,464
Gross Unrealized Gains | 647
Gross Unrealized Losses | (39)
Fair Value, Total | 100,072
Asset-Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Total | 52,376
Asset-Backed Securities [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 17,668
Gross Unrealized Gains | 16
Gross Unrealized Losses | (18)
Fair Value, Total | 17,666
Asset-Backed Securities [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 34,831
Gross Unrealized Gains | 32
Gross Unrealized Losses | (153)
Fair Value, Total | 34,710
Municipal Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Total | 34,070
Municipal Bonds [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 16,198
Gross Unrealized Gains | 26
Fair Value, Total | 16,224
Municipal Bonds [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 17,726
Gross Unrealized Gains | 121
Gross Unrealized Losses | (1)
Fair Value, Total | 17,846
Agency Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Total | 36,923
Agency Bonds [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 7,489
Gross Unrealized Losses | (7)
Fair Value, Total | 7,482
Agency Bonds [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 29,411
Gross Unrealized Gains | 54
Gross Unrealized Losses | (24)
Fair Value, Total | 29,441
Treasury Bills [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Total | 42,273
Treasury Bills [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 5,996
Gross Unrealized Gains | 1
Fair Value, Total | 5,997
Treasury Bills [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 36,277
Gross Unrealized Gains | 8
Gross Unrealized Losses | (9)
Fair Value, Total | 36,276
Covered Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Total | 11,182
Covered Bonds [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 5,637
Gross Unrealized Gains | 2
Gross Unrealized Losses | (21)
Fair Value, Total | 5,618
Covered Bonds [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 5,555
Gross Unrealized Gains | 9
Fair Value, Total | 5,564
Sovereign Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Total | 14,592
Sovereign Bonds [Member] | Short-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 4,000
Gross Unrealized Losses | (14)
Fair Value, Total | 3,986
Sovereign Bonds [Member] | Long-term investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Amortized Cost | 10,589
Gross Unrealized Gains | 20
Gross Unrealized Losses | (3)
Fair Value, Total | $ 10,606

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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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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 Reference 6: 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=7534914&loc=d3e22054-111558 Reference 7: 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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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