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Equity - Preferred Stock (Detail)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Class of Stock    
Shares authorized (in shares) 50,000 50,000
Shares oustanding at end of period (in shares) 7,650 7,650
8.5% Convertible perpetual preferred stock
    
Class of Stock    
Shares oustanding at end of period (in shares) 2,650 2,650
6.0% Convertible perpetual preferred stock
    
Class of Stock    
Shares oustanding at end of period (in shares) 2,000 2,000
7.0% Convertible perpetual preferred stock
    
Class of Stock    
Shares oustanding at end of period (in shares) 3,000 3,000