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Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Level 1 [Member] |  |
Derivative [Line Items] |  |
Linked common shares |  | 1,725,000
Quoted market price on valuation date |  | $ 2.97
Contractual exercise rate |  | $ 2.4648
Term (years) |  | 9 months 11 days
Level 2 [Member] |  |
Derivative [Line Items] |  |
Linked common shares | 525,000 | 525,000
Quoted market price on valuation date | $ 2.02 | $ 2.97
Contractual exercise rate | $ 2.3793 | $ 2.4648
Term (years) | 3 months 11 days | 1 year 3 months 11 days
Level 3 [Member] |  |
Derivative [Line Items] |  |
Linked common shares | 1,562,500 | 1,562,500
Quoted market price on valuation date | $ 2.02 | $ 2.97
Contractual exercise rate | $ 3.60 | $ 3.60
Term (years) | 3 years 4 months 6 days | 4 years 4 months 6 days
Minimum [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Range of market volatilities |  | 33.10%
Risk free rates using zero coupon US Treasury Security rates |  | 0.02%
Minimum [Member] | Level 2 [Member] |  |
Derivative [Line Items] |  |
Range of market volatilities | 50.10% | 33.80%
Risk free rates using zero coupon US Treasury Security rates | 0.01% | 0.02%
Minimum [Member] | Level 3 [Member] |  |
Derivative [Line Items] |  |
Range of market volatilities | 51.10% | 39.20%
Risk free rates using zero coupon US Treasury Security rates | 0.07% | 0.05%
Maximum [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Range of market volatilities |  | 49.17%
Risk free rates using zero coupon US Treasury Security rates |  | 0.11%
Maximum [Member] | Level 2 [Member] |  |
Derivative [Line Items] |  |
Range of market volatilities | 88.30% | 63.60%
Risk free rates using zero coupon US Treasury Security rates | 0.07% | 0.16%
Maximum [Member] | Level 3 [Member] |  |
Derivative [Line Items] |  |
Range of market volatilities | 78.20% | 70.20%
Risk free rates using zero coupon US Treasury Security rates | 0.78% | 0.54%

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- Definition Derivative financial instruments fair value assumptions contractual exercise rate. + References No definition available. + Details
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- Definition Derivative financial instruments fair value assumptions linked common shares. + References No definition available. + Details
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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 assumptions term in years. + References No definition available. + 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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