Reserve for Known and Incurred but Not Reported Claims (Summary of Loss Reserves) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Insurance [Abstract]
Known title claims, amount	$ 84,478	$ 165,330
Incurred but not reported claims, amount	830,255	802,069
Total title claims, amount	914,733	967,399
Non-title claims, amount	56,720	44,381
Total loss reserves, amount	$ 971,453	$ 1,011,780
Known title claims, percent	8.70%	16.30%
Incurred but not reported claims, percent	85.50%	79.30%
Total title claims, percent	94.20%	95.60%
Non-title claims, percent	5.80%	4.40%
Total loss reserves, percent	100.00%	100.00%