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Schedule II. Condensed Financial Information of Registrant - Condensed Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Assets        
Short-term investments $ 29,580 $ 7,718    
Other investments 13,330 12,217    
Total investments 1,084,474 1,045,152    
Cash and cash equivalents 58,936 69,481 $ 90,956 $ 123,077
Deferred income taxes 33,811 29,905    
Property and equipment, net 6,636 6,181    
Other assets 37,668 42,788    
Total assets 1,518,856 1,502,045    
Liabilities, redeemable preferred stock and shareholders’ equity        
Total liabilities 1,062,706 1,048,064    
Shareholders' equity (net of Treasury stock of $22,370 at December 31, 2016 and 2015 456,150 453,981 446,968 416,814
Total liabilities and shareholders’ equity 1,518,856 1,502,045    
Parent Company [Member]        
Assets        
Short-term investments 11,939      
Other investments 13,330 12,217    
Investment in subsidiaries 415,767 408,135    
Total investments 441,036 420,352    
Cash and cash equivalents 9,596 26,968 $ 43,585 $ 47,726
Deferred income taxes 675 292    
Notes receivable from subsidiaries 1,587 1,505    
Property and equipment, net 1,942 1,817    
Other assets 1,314 3,047    
Total assets 456,150 453,981    
Liabilities, redeemable preferred stock and shareholders’ equity        
Shareholders' equity (net of Treasury stock of $22,370 at December 31, 2016 and 2015 456,150 453,981    
Total liabilities and shareholders’ equity $ 456,150 $ 453,981