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Schedule II - Condensed Financial Information of Registrant - Condensed Balance Sheets (Parenthetical) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Parent Company Only Financial Information [Line Items]    
Cumulative convertible preferred stock, par value $ 0.01 $ 0.01
Cumulative convertible preferred stock, shares authorized 1,000 1,000
Cumulative convertible preferred stock, shares issued 30 108
Cumulative convertible preferred stock, shares outstanding 30 108
Cumulative convertible preferred stock, minimum liquidation preference $ 6.98 $ 2.66
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 55,000 55,000
Common stock, shares issued 43,641 41,889
Common stock, shares outstanding 35,366 40,871
Treasury stock, shares 8,275 1,018
Parent Company [Member]
    
Parent Company Only Financial Information [Line Items]    
Cumulative convertible preferred stock, par value $ 0.01 $ 0.01
Cumulative convertible preferred stock, shares authorized 1,000 1,000
Cumulative convertible preferred stock, shares issued 30 108
Cumulative convertible preferred stock, shares outstanding 30 108
Cumulative convertible preferred stock, minimum liquidation preference $ 6.98 $ 2.66
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 55,000 55,000
Common stock, shares issued 43,641 41,889
Common stock, shares outstanding 35,366 40,871
Treasury stock, shares 8,275 1,018