Finance Receivables - DriveTime - Age Analysis of Past Due Finance Receivables (Details) (USD $) In Thousands, unless otherwise specified				6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan charge-offs, days delinquent at month end				91 days	121 days
Current, Percent of Portfolio	58.30%	49.10%	59.00%
Current, Loan Principal	$ 1,045,473	$ 786,765	$ 953,725
01-30 Days, Percent of Portfolio	29.30%	33.00%	31.20%
01-30 Days, Loan Principal	524,428	528,300	504,339
31-60 Days, Percent of Portfolio	8.30%	10.00%	6.50%
31-60 Days, Loan Principal	148,636	161,157	104,500
61-90 Days, Percent of Portfolio	3.80%	5.10%	2.90%
61-90 Days, Loan Principal	67,975	81,378	46,574
91-120 Days, Percent of Portfolio	0.30%	2.80%	0.40%
91-120 Days, Loan Principal	6,054	44,110	7,027
Total Past Due, Percent of Portfolio	41.70%	50.90%	41.00%
Total Past Due, Loan Principal	747,093	814,945	662,440
Total Finance Receivales, Percent of Portfolio	100.00%	100.00%	100.00%
Total Finance Receivables, Loan Principal	$ 1,792,566	$ 1,601,710	$ 1,616,165