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Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Level 1 [Member] |  |  |
Derivative [Line Items] |  |  |
Linked common shares |  | 1,725,000 |
Quoted market price on valuation date |  | $ 3.26 |
Contractual exercise rate |  | $ 2.4648 |
Term (years) |  | 6 months 11 days |
Level 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Linked common shares | 525,000 | 525,000 | 525,000
Quoted market price on valuation date | $ 2.29 | $ 3.26 | $ 2.02
Contractual exercise rate | $ 2.3793 | $ 2.4648 | $ 2.3793
Term (years) | 15 days | 1 year 15 days | 3 months 11 days
Risk free rates using zero coupon US Treasury Security rates | 0.05% |  |
Level 3 [Member] |  |  |
Derivative [Line Items] |  |  |
Linked common shares | 1,562,500 | 1,562,500 | 1,562,500
Quoted market price on valuation date | $ 2.29 | $ 3.26 | $ 2.02
Contractual exercise rate | $ 3.6000 | $ 3.6000 | $ 3.6000
Term (years) | 3 years 1 month 10 days | 4 years 1 month 6 days | 3 years 4 months 6 days
Custom lattice variable: Probability of exercisability (434,027 linked common shares) |  |  |
Minimum [Member] | Level 1 [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities |  | 33.80% |
Risk free rates using zero coupon US Treasury Security rates |  | 0.04% |
Minimum [Member] | Level 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities | 15.20% | 34.10% | 50.10%
Risk free rates using zero coupon US Treasury Security rates |  | 0.04% | 0.01%
Minimum [Member] | Level 3 [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities | 47.90% | 34.10% | 51.10%
Risk free rates using zero coupon US Treasury Security rates | 0.05% | 0.07% | 0.07%
Custom lattice variable: Probability of exercisability (434,027 linked common shares) |  |  |
Maximum [Member] | Level 1 [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities |  | 44.40% |
Risk free rates using zero coupon US Treasury Security rates |  | 0.11% |
Maximum [Member] | Level 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities | 29.20% | 45.30% | 88.30%
Risk free rates using zero coupon US Treasury Security rates |  | 0.14% | 0.07%
Maximum [Member] | Level 3 [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities | 66.10% | 67.70% | 78.20%
Risk free rates using zero coupon US Treasury Security rates | 0.90% | 0.57% | 0.78%
Custom lattice variable: Probability of exercisability (434,027 linked common shares) |  |  |

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- Definition Derivative financial instruments fair value assumptions linked common shares. + 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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- Definition Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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