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Senior Convertible Notes - Additional Information (Detail) (USD $)
0 Months Ended
Aug. 18, 2010
D
Jun. 30, 2014
Dec. 31, 2013
Aug. 18, 2010
Debt Instrument [Line Items]        
Accrued interest   $ 2,000,000    
Senior convertible notes due August 15, 2015
       
Debt Instrument [Line Items]        
Principal amount   100,000,000 100,000,000 100,000,000
Senior notes, effective interest rate   5.75%   5.75%
Accrued interest   2,400,000 2,400,000  
No of convertible shares 147.0859      
Principal amount per share $ 1,000      
Conversion price of shares       $ 6.80
Percentage of repurchase price 100.00%      
Percentage of conversion price equaling stock price 150.00%      
Trading days 20      
Consecutive trading days 30 days      
Issuance cost       $ 4,200,000