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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
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

X

- 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.

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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

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+ References

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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

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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