Reserve for Known and Incurred but Not Reported Claims (Summary of Loss Reserves) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Insurance [Abstract]
Known title claims, amount	$ 87,543	$ 165,330
Incurred but not reported claims	844,364	802,069
Total title claims, amount	931,907	967,399
Non-title claims, amount	51,973	44,381
Total loss reserves, amount	$ 983,880	$ 1,011,780	$ 1,018,365	$ 976,462
Known title claims, percent	8.90%	16.30%
Incurred but not reported claims, percent	85.80%	79.30%
Total title claims, percent	94.70%	95.60%
Non-title claims, percent	5.30%	4.40%
Total loss reserves, percent	100.00%	100.00%