Receivables - Percentage of Receivables by State (Detail)	Sep. 30, 2012	Dec. 31, 2011
California [Member]
Financing Receivable, Impaired [Line Items]
Percentage of mortgage loan receivables on real estate by state	9.40%	9.50%
Percentage of personal non-credit card receivables by state	4.60%	5.10%
Percentage of receivables by state	9.00%	9.10%
New York [Member]
Financing Receivable, Impaired [Line Items]
Percentage of mortgage loan receivables on real estate by state	7.40%	7.20%
Percentage of personal non-credit card receivables by state	6.80%	6.80%
Percentage of receivables by state	7.30%	7.20%
Pennsylvania [Member]
Financing Receivable, Impaired [Line Items]
Percentage of mortgage loan receivables on real estate by state	6.20%	6.10%
Percentage of personal non-credit card receivables by state	6.90%	6.70%
Percentage of receivables by state	6.30%	6.20%
Florida [Member]
Financing Receivable, Impaired [Line Items]
Percentage of mortgage loan receivables on real estate by state	5.80%	5.90%
Percentage of personal non-credit card receivables by state	5.80%	5.80%
Percentage of receivables by state	5.80%	5.90%
Ohio [Member]
Financing Receivable, Impaired [Line Items]
Percentage of mortgage loan receivables on real estate by state	5.50%	5.50%
Percentage of personal non-credit card receivables by state	6.40%	6.30%
Percentage of receivables by state	5.60%	5.60%
Virginia [Member]
Financing Receivable, Impaired [Line Items]
Percentage of mortgage loan receivables on real estate by state	5.20%	5.20%
Percentage of personal non-credit card receivables by state	3.10%	3.00%
Percentage of receivables by state	5.10%	4.90%