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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%