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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)