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Debt - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2009 | Mar. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Mar. 31, 2009 Maximum | Mar. 30, 2014 Maximum | Apr. 30, 2009 4.50% Convertible Senior Notes Due March 15, 2014 | Mar. 30, 2014 4.50% Convertible Senior Notes Due March 15, 2014
Debt Instrument |  |  |  |  |  |  |  |
Borrowings from local bank | $ 10,000,000 |  |  |  |  |  |  |
Term of loan, years | 5 years |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 0.80% |  |  |  |  |  | 4.50% |
Loan collateralized by real estate mortgage | 6,000,000 |  |  |  |  |  |  |
Unsecured loan | 4,000,000 |  |  |  |  |  |  |
Semiannual principal payments of loan |  | 1,000,000 | 1,000,000 |  |  |  |  |
Aggregate principal amount |  |  |  | 189,998,000 |  |  | 190,000,000 |
Initial debt conversion price |  |  |  |  |  |  | $ 5.4750 |
Conversion rate in number of shares |  |  |  |  |  |  | 182.65 | 131.95
Additional aggregate principal amount |  |  |  |  |  |  | 1,000 |
Senior notes maturity date |  |  |  |  |  |  | Mar. 15, 2014 |
Number of shares excluded for conversion rate calculation |  |  |  |  |  |  |  | 50.7
Trading days used to determine average price per share |  |  |  |  |  |  |  | 25 days
Average trading price of common shares |  |  |  |  |  |  |  | $ 19.74
Payments of long-term debt |  | $ 190,975,000 |  |  |  |  |  | $ 190,000,000
Stock issued in conversion of notes |  |  |  |  |  |  |  | 25,100,000
Stock received and retired |  |  |  |  |  |  |  | 25,100,000
Strike price per share of warrant |  | $ 7.6650 |  |  |  |  |  |
Warrants settled on a daily basis |  | 534,000 |  |  |  |  |  |
Warrant settlement period |  | 65 days |  |  |  |  |  |
Common stock shares issuable upon exercise of the warrants |  |  |  |  |  | 34,526,500 |  |
Percentage of warrant price in excess of closing price of common stock |  |  |  |  | 19.99% |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer. + References Reference 1: 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 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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