Segment Reporting - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013 Segment	Jun. 30, 2012 Eliminations [Member]	Mar. 31, 2013 Servicing [Member]	Jun. 30, 2012 Servicing [Member] Operating Segments [Member]	Mar. 31, 2013 Insurance [Member]	Jun. 30, 2012 Insurance [Member] Operating Segments [Member]	Mar. 31, 2013 Originations [Member]	Jun. 30, 2013 Originations [Member] Operating Segments [Member]	Jun. 30, 2012 Loans and Residuals [Member] Operating Segments [Member]	Jun. 30, 2012 Other [Member] Operating Segments [Member]	Jun. 30, 2012 Asset Receivables Management [Member] Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Number of reportable segment	6
Increase (decrease) to income before taxes			$ (14.1)		$ 0.2		$ 13.9
Increased costs allocated to the segments				6.5		29.3		2.9	16.9	288.9
Decreased costs allocated to the segments		$ 342.7									$ 1.8