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Equity - Preferred Stock (Detail)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Stockholders Equity Note [Line Items]    
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
    
Stockholders Equity Note [Line Items]    
Shares oustanding at end of period (in shares) 2,650 2,650
6.0% Convertible perpetual preferred stock
    
Stockholders Equity Note [Line Items]    
Shares oustanding at end of period (in shares) 2,000 2,000
7.0% Convertible perpetual preferred stock
    
Stockholders Equity Note [Line Items]    
Shares oustanding at end of period (in shares) 3,000 3,000