XML 124 R103.htm IDEA: XBRL DOCUMENT v3.10.0.1
Schedule II - Condensed Financial Information of Registrant - Condensed Balance Sheets - Additional Information (Detail) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Information Disclosure [Abstract]        
Cumulative convertible preferred stock, par value (in dollars per share) $ 0.01 $ 0.01    
Cumulative convertible preferred stock, shares authorized (in shares) 1,000,000 1,000,000    
Cumulative convertible preferred stock, shares issued (in shares) 10,000 10,000    
Cumulative convertible preferred stock, shares outstanding (in shares) 10,000 10,000    
Cumulative convertible preferred stock, minimum liquidation preference (in dollars per share) $ 9.99 $ 9.99    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01    
Common stock, shares authorized (in shares) 55,000,000 55,000,000    
Common stock, shares issued (in shares) 46,514,000 45,778,000 45,324,000 45,525,000
Common stock, shares outstanding (in shares) 34,783,000 34,735,000 35,052,000 35,110,000
Treasury stock, shares (in shares) 11,731,000 11,043,000 10,272,000 10,415,000