Other Assets - Other Assets (Parenthetical) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014
Other Assets [Line Items]
Upfront fee	$ 150,000
Finance and other interest income amortization period	10 years

Upfront Fee Paid In Accordance With Private Label Financing Agreement

No definition available.

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Namespace Prefix:	sc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration