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Reserve for Known and Incurred but Not Reported Claims (Summary of Loss Reserves) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Insurance [Abstract]        
Known title claims, amount $ 79,102 $ 80,306    
Incurred but not reported claims, amount 876,991 877,134    
Total title claims, amount 956,093 957,440    
Non-title claims, amount 77,541 85,239    
Total loss reserves, amount $ 1,033,634 $ 1,042,679 $ 1,021,346 $ 1,028,933
Known title claims, percent 7.70% 7.70%    
Incurred but not reported claims, percent 84.80% 84.10%    
Total title claims, percent 92.50% 91.80%    
Non-title claims, percent 7.50% 8.20%    
Total loss reserves, percent 100.00% 100.00%