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Investments - Gains Unrealized Gains and (Losses) Aggregated by Investment Category Short-Term and Long-Term Securities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	$ 345,792
Investments, Gross Unrealized Gains	27
Investments, Gross Unrealized (Losses)	(18)
Short-term investments, Estimated Fair Value	345,801	326,862
Long-term investments, Estimated Fair Value	15,788	12,158
Bankers' Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Short-term investments, Estimated Fair Value	145	242
Time Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Short-term investments, Estimated Fair Value	52,157	52
Long-term investments, Estimated Fair Value	54
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Short-term investments, Estimated Fair Value	46,495
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Short-term investments, Estimated Fair Value	5,004	13,054
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Short-term investments, Estimated Fair Value	242,000	313,514
Long-term investments, Estimated Fair Value	15,734	12,158
Short Term [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost		326,601
Investments, Gross Unrealized Gains		267
Investments, Gross Unrealized (Losses)		(6)
Short Term [Member] | Bankers' Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	145	242
Short Term [Member] | Time Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	52,157	52
Short Term [Member] | Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	46,495
Short Term [Member] | U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	5,003	13,045
Investments, Gross Unrealized Gains	1	9
Short Term [Member] | U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	241,992	313,262
Investments, Gross Unrealized Gains	26	258
Investments, Gross Unrealized (Losses)	(18)	(6)
Long Term [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	15,790
Investments, Gross Unrealized Gains	1
Investments, Gross Unrealized (Losses)	(3)
Long Term [Member] | Time Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	54
Long Term [Member] | U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	15,736	12,156
Investments, Gross Unrealized Gains	1	2
Investments, Gross Unrealized (Losses)	$ (3)

X

- Definition

Amount of accumulated pre-tax unrealized gains before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

+ References

No definition available.

+ Details

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X

- 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.

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- Definition

This item represents the cost of debt and equity 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ 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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

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- Definition

Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer.

+ 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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 45

-Paragraph 2

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