Segment Information (Narrative) (Detail)	9 Months Ended
	Sep. 30, 2017 State
Segment Reporting Information [Line Items]
Number of states issues title insurance policies	49
Number of states licensed to issues property and casualty insurance policies	50
Number of states issues property and casualty policies	47
Number of states issues home warranty contracts	39
California
Segment Reporting Information [Line Items]
Policy liability percentage	65.00%