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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Cash and Cash Equivalents, USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash | $ 4,457 | $ 3,893
Money market funds | 365,600 | 203,500
Quoted prices in active markets for identical assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash | 4,457 | 3,893
Money market funds | $ 365,600 | $ 203,500

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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