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Schedule II. Condensed Financial Information of Registrant - Condensed Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets        
Equity securities, at fair value (cost $10,007 and $8,503 in 2018 and 2017, respectively) $ 18,651 $ 9,282    
Short-term investments 14,231 25,770    
Total investments 1,125,490 1,130,314    
Cash and cash equivalents 40,344 55,559 $ 58,936 $ 69,481
Deferred income taxes 21,852 19,262    
Property and equipment, net 6,258 6,128    
Federal income tax recoverable   1,761    
Other assets 17,572 9,959    
Total assets 1,515,931 1,518,236    
Liabilities, redeemable preferred stock and shareholders’ equity        
Total liabilities 1,106,169 1,092,813    
Shareholders' equity (net of Treasury stock of $22,370 at December 31, 2018 and 2017) 409,762 425,423 456,150 453,981
Total liabilities and shareholders’ equity 1,515,931 1,518,236    
Parent Company [Member]        
Assets        
Equity securities, at fair value (cost $10,007 and $8,503 in 2018 and 2017, respectively) 9,803 9,248    
Short-term investments   7,962    
Investment in subsidiaries 388,797 386,844    
Total investments 398,600 404,054    
Cash and cash equivalents 5,509 16,351 $ 9,596 $ 26,968
Deferred income taxes 509 302    
Notes receivable from subsidiaries 3,270 1,711    
Property and equipment, net 1,536 1,359    
Federal income tax recoverable 2,995      
Other assets 800 4,412    
Total assets 413,219 428,189    
Liabilities, redeemable preferred stock and shareholders’ equity        
Total liabilities 3,457 2,766    
Shareholders' equity (net of Treasury stock of $22,370 at December 31, 2018 and 2017) 409,762 425,423    
Total liabilities and shareholders’ equity $ 413,219 $ 428,189