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Derivative Financial Instruments - Significant Assumptions Utilized in Valuation Technique (Detail) (Monte Carlo Simulations [Member], Senior Convertible Notes [Member], USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Derivative [Line Items] |  |
Quoted market price on valuation date | $ 3.00 | $ 2.97
Contractual conversion rate | $ 3.17 | $ 3.74
Contractual term to maturity | 6 months 29 days | 1 year 3 months 29 days
Implied expected term to maturity | 6 months 26 days | 1 year 2 months 27 days
Market volatility: |  |
Range of equivalent credit risk adjusted yields | 0.58% |
Minimum [Member] |  |
Market volatility: |  |
Range of volatilities | 24.00% | 31.30%
Range of equivalent volatilities | 32.20% | 38.60%
Contractual interest rate | 8.00% | 8.00%
Range of equivalent market risk adjusted interest rates | 8.02% | 9.00%
Range of equivalent credit risk adjusted yields |  | 0.94%
Risk-free rates | 0.03% | 0.02%
Maximum [Member] |  |
Market volatility: |  |
Range of volatilities | 46.20% | 64.03%
Range of equivalent volatilities | 37.80% | 45.00%
Contractual interest rate | 9.00% | 9.00%
Range of equivalent market risk adjusted interest rates | 9.08% | 9.10%
Range of equivalent credit risk adjusted yields |  | 1.03%
Risk-free rates | 0.04% | 0.16%

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- Definition Derivative financial instruments fair value assumptions quoted market price. + References No definition available. + Details
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- Definition Derivative financial instruments fair value contractual term to maturity. + References No definition available. + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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