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Investments - Schedule of Fair Value of Available for Sale of Investments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule Of Available For Sale And Trading Securities [Line Items]
Fair value of short-term available-for-sale investments	$ 345,801	$ 326,862
Fair value of long-term available-for-sale investments	15,788	12,158
Fair value of short-term investments	346,715	327,653
Bankers' Acceptance Drafts [Member]
Schedule Of Available For Sale And Trading Securities [Line Items]
Fair value of short-term available-for-sale investments	145	242
Time Deposits [Member]
Schedule Of Available For Sale And Trading Securities [Line Items]
Fair value of short-term available-for-sale investments	52,157	52
Fair value of long-term available-for-sale investments	54
Fair value of long-term available-for-sale investments	54
Commercial Paper [Member]
Schedule Of Available For Sale And Trading Securities [Line Items]
Fair value of short-term available-for-sale investments	46,495
U.S. Treasury Obligations [Member]
Schedule Of Available For Sale And Trading Securities [Line Items]
Fair value of short-term available-for-sale investments	5,004	13,054
Fair value of short-term available-for-sale investments, U.S. agency obligations	5,004	13,054
U.S. Agency Obligations [Member]
Schedule Of Available For Sale And Trading Securities [Line Items]
Fair value of short-term available-for-sale investments	242,000	313,514
Fair value of short-term available-for-sale investments, U.S. agency obligations	242,000	313,514
Fair value of long-term available-for-sale investments	15,734	12,158
Mutual Funds [Member]
Schedule Of Available For Sale And Trading Securities [Line Items]
Fair value of short-term investments, mutual funds	$ 914	$ 791

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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

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Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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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

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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