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Cash and Cash Equivalents and Investments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Investment Holdings [Line Items] |  |  |
Restricted cash | $ 12,564 | $ 97,878 |
Period cash equivalents and short-term investments have been in continuous unrealized loss position, years, maximum | 1 year |  |
Period cash equivalents and long-term investments have been in continuous unrealized loss position, years, minimum | 1 year |  |
Cumulative unrealized income (loss) on municipal bonds | (13) | (152) | (40)
Letter of credit [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Restricted cash | 12,600 | 7,400 |
Credit Agreement [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Restricted cash |  | 88,000 |
Funds restricted for legal matter [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Restricted cash |  | 2,500 |
Municipal bond [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Period debt obligations mature, years, maximum | 1 year |  |
Cumulative unrealized income (loss) on municipal bonds | $ 500 |  |

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- Definition Short Term Investment Continuous Unrealized Loss Position Period + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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- Definition The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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