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Debt - Exchangeable Senior Notes - Additional Information (Detail) (USD $)
1 Months Ended
Jul. 31, 2011
Apr. 30, 2008
Mar. 31, 2008
Dec. 31, 2013
Aug. 31, 2011
Debt Instrument [Line Items]          
Unsecured senior notes, interest rate       $ 12,781,000  
Exchangeable senior notes [Member]
         
Debt Instrument [Line Items]          
Senior Notes   7,000,000 75,000,000   1,500,000
Proceeds from senior notes   6,800,000 72,800,000    
Percentage of outstanding notes purchased from senior unsecured notes offering 85.00%        
Price of principal amount plus accrued and unpaid interest, in percentage 118.50%        
Price of principal amount plus accrued and unpaid interest, in amount 84,200,000        
Unsecured senior notes, interest rate       $ 0.0925