Basis of Condensed Consolidated Financial Statements (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Increase in premiums earned by agent	$ 512,245	$ 432,920
Increase in personnel costs	382,712	366,123
Increase in premiums earned by agent	405,039	342,736
Decrease in operating expenses	186,675	200,158
Decrease to direct premiums and escrow fees	501,914	501,412
Information and other	$ 155,077	157,147
Title Insurance and Services
Segment Reporting Information [Line Items]
Increase in premiums earned by agent		6,600
Increase in personnel costs		7,800
Increase in premiums earned by agent		300
Decrease in operating expenses		(8,100)
Decrease to direct premiums and escrow fees		(10,500)
Information and other		10,500
Specialty Insurance
Segment Reporting Information [Line Items]
Increase in personnel costs		300
Decrease in operating expenses		$ (300)