Other Assets - Other Assets (Parenthetical) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013
Other Assets [Abstract]
Upfront fee	$ 0	$ 150,000
Finance and other interest income amortization period	10 years

Upfront Fee Paid In Accordance With Private Label Financing Agreement

No definition available.

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