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Debt - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2009 | Mar. 30, 2014 | Sep. 30, 2013 | Jun. 29, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Mar. 31, 2009 | Mar. 13, 2014 4.50% Convertible Senior Notes Due March 15, 2014 | Apr. 30, 2009 4.50% Convertible Senior Notes Due March 15, 2014 | Jun. 29, 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 |  |  |  | 0 |  | 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 | $ 1,063,000 |  |  |  |  | $ 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 |  |  |  | $ 7.6389 |  |  |  |  |  |
Warrants settled on a daily basis |  |  |  | 536,000 |  |  |  |  |  |
Warrant settlement period |  |  |  | 65 days |  |  |  |  |  |
Common stock shares were issued for warrants exercised |  |  |  | 1,900,000 |  |  |  |  |  |

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