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Subsequent Event - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2009 | Jan. 31, 2012 Financing 3.5% exchangeable senior notes due 2032 | Jan. 09, 2012 Financing 3.5% exchangeable senior notes due 2032 | Jan. 31, 2012 Private Placement 3.5% exchangeable senior notes due 2032 | Jan. 09, 2012 Private Placement 3.5% exchangeable senior notes due 2032 | Jan. 31, 2012 Private Placement 3.5% exchangeable senior notes due 2032 Minimum | Jan. 31, 2012 Private Placement 3.5% exchangeable senior notes due 2032 Maximum
Subsequent Event [Line Items] |  |  |  |  |  |  |
Convertible senior notes |  |  | $ 150,000,000 |  |  |  |
Convertible senior notes, stated interest rate |  |  | 3.50% |  |  |  |
Proceeds from private placement of convertible senior notes | $ 5,600,000 | $ 144,300,000 |  |  |  |  |
Convertible senior notes, payment start date |  | 2012-07-15 |  |  |  |  |
Convertible senior notes, maturity date |  | Jan. 15, 2032 |  |  |  |  |
Percentage of repurchase price to principal amount |  |  | 100.00% |  |  |  |
Convertible senior notes, conversion starting date |  |  |  | Oct. 15, 2031 |  |  |
Convertible senior notes, number of shares of common stock per $1,000 principal amount of notes |  |  |  |  | 113.4572 |  |
Convertible senior notes, conversion price per share of common stock |  |  |  | $ 8.8125 |  |  |
Convertible senior notes, conversion circumstance, last reported sale price of common stock as percentage of conversion price |  |  |  |  |  | 130.00% |
Convertible senior notes, conversion circumstance, trading price per $1,000 principal amount of notes as percentage of the product of the last reported sale price |  |  |  |  |  |  | 98.00%

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- Definition Debt Instrument Conversion Circumstance Trading Price per Certain Principal Amount of Debt as Percentage of Common Stock Price + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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