Segment Reporting - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Segment	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Number of reportable segments	3
Operating Segments [Member] | Servicing [Member]
Segment Reporting Information [Line Items]
Effect On Previously Reported Segment Income (Loss) Before Taxes For Change In Composition Of Reportable Segments		$ 5.2
Effect On Previously Reported Segment Total Assets For Change in Composition Of Reportable Segments			(3.0)
Operating Segments [Member] | Originations [Member]
Segment Reporting Information [Line Items]
Effect On Previously Reported Segment Income (Loss) Before Taxes For Change In Composition Of Reportable Segments		(6.0)
Operating Segments [Member] | Reverse Mortgage [Member]
Segment Reporting Information [Line Items]
Effect On Previously Reported Segment Income (Loss) Before Taxes For Change In Composition Of Reportable Segments		0.7
Operating Segments [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Effect On Previously Reported Segment Income (Loss) Before Taxes For Change In Composition Of Reportable Segments		0.1
Effect On Previously Reported Segment Total Assets For Change in Composition Of Reportable Segments			(40.1)
Eliminations [Member]
Segment Reporting Information [Line Items]
Effect On Previously Reported Segment Total Assets For Change in Composition Of Reportable Segments			$ 43.1