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Schedule II - Condensed Financial Information of Registrant - Condensed Balance Sheets (Parenthetical) (Detail) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Dec. 02, 2014
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]      
Contingently redeemable common stock, issued shares 0 1,000,000 1,000,000
Contingently redeemable common stock, outstanding shares 0 1,000,000  
Cumulative convertible preferred stock, par value $ 0.01 $ 0.01  
Cumulative convertible preferred stock, shares authorized 1,000,000 1,000,000  
Cumulative convertible preferred stock, shares issued 10,000 12,000  
Cumulative convertible preferred stock, shares outstanding 10,000 12,000  
Cumulative convertible preferred stock, minimum liquidation preference $ 9.99 $ 8.49  
Common stock, par value $ 0.01 $ 0.01  
Common stock, shares authorized 55,000,000 55,000,000  
Common stock, shares issued 45,525,000 43,769,000  
Common stock, shares outstanding 35,110,000 34,102,000  
Treasury stock, shares 10,415,000 9,667,000