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Credit Facility - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Sep. 27, 2012
Line of Credit Facility [Line Items]      
Line of credit facility maximum borrowing capacity $ 60,000,000   $ 75,000,000
Line of credit facility outstanding amount 57,900,000    
Applicable margin spread over LIBOR, minimum 1.50%    
Applicable margin spread over LIBOR, maximum 2.00%    
Rate of credit facility 3.25%    
Net Profit (27,562,000) (16,000,000)  
Line of credit facility over borrowing capacity amount advanced 29,000,000    
Line of credit facility, maturity date Apr. 02, 2013    
Minimum
      
Line of Credit Facility [Line Items]      
Applicable margin spread over base rate (0.50%)    
Percentage of fee for unused amount of credit facility 0.125%    
Maximum
      
Line of Credit Facility [Line Items]      
Line of credit facility over advance amount 30,000,000    
Applicable margin spread over base rate 0.00%    
Percentage of fee for unused amount of credit facility 0.25%    
Scenario, Forecast
      
Line of Credit Facility [Line Items]      
Consolidated leverage ratio 3    
Consolidated Net Profit 1    
Financial covenants, liquidity amount 100,000,000    
Scenario, Actual
      
Line of Credit Facility [Line Items]      
Consolidated leverage ratio 35.02    
Financial covenants, liquidity amount 165,600,000    
Scenario, Actual | Consolidated Entities
      
Line of Credit Facility [Line Items]      
Net Profit $ (34,400,000)