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Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Detail) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Level 1 [Member] |  |  |
Derivative [Line Items] |  |  |
Linked common shares | 1,725,000 | 1,800,000 | 1,725,000
Quoted market price on valuation date | $ 3.00 | $ 3.15 | $ 2.97
Contractual exercise rate | $ 2.4648 | $ 2.5000 | $ 2.4648
Term (years) | 11 days | 1 year 11 days | 9 months 11 days
Risk free rates using zero coupon US Treasury Security rates | 0.03% |  |
Level 1 [Member] | Minimum [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities | 24.00% | 38.90% | 33.10%
Risk free rates using zero coupon US Treasury Security rates |  | 0.06% | 0.02%
Level 1 [Member] | Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities | 31.50% | 68.10% | 49.17%
Risk free rates using zero coupon US Treasury Security rates |  | 0.17% | 0.11%
Level 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Linked common shares | 525,000 | 525,000 | 525,000
Quoted market price on valuation date | $ 3.00 | $ 3.15 | $ 2.97
Contractual exercise rate | $ 2.4648 | $ 2.7500 | $ 2.4648
Term (years) | 6 months 15 days | 1 year 6 months 15 days | 1 year 3 months 11 days
Level 2 [Member] | Minimum [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities | 26.30% | 38.70% | 33.80%
Risk free rates using zero coupon US Treasury Security rates | 0.02% | 0.06% | 0.02%
Level 2 [Member] | Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities | 46.10% | 69.20% | 63.60%
Risk free rates using zero coupon US Treasury Security rates | 0.04% | 0.20% | 0.16%
Level 3 [Member] |  |  |
Derivative [Line Items] |  |  |
Linked common shares | 1,562,500 | 1,562,500 | 1,562,500
Quoted market price on valuation date | $ 3.00 | $ 3.15 | $ 2.97
Contractual exercise rate | $ 3.60 | $ 3.60 | $ 3.60
Term (years) | 3 years 7 months 10 days | 4 years 7 months 6 days | 4 years 4 months 6 days
Level 3 [Member] | Minimum [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities | 38.20% | 54.20% | 39.20%
Risk free rates using zero coupon US Treasury Security rates | 0.02% | 0.10% | 0.05%
Level 3 [Member] | Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities | 60.50% | 71.00% | 70.20%
Risk free rates using zero coupon US Treasury Security rates | 0.63% | 0.47% | 0.54%

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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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