Reserve for Known and Incurred but Not Reported Claims (Summary of Loss Reserves) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Insurance [Abstract]
Known title claims, amount	$ 99,258	$ 165,330
Incurred but not reported claims, amount	803,280	802,069
Total title claims, amount	902,538	967,399
Non-title claims, amount	44,309	44,381
Total loss reserves, amount	$ 946,847	$ 1,011,780
Known title claims, percent	10.50%	16.30%
Incurred but not reported claims, percent	84.80%	79.30%
Total title claims, percent	95.30%	95.60%
Non-title claims, percent	4.70%	4.40%
Total loss reserves, percent	100.00%	100.00%